This document discusses the mechanism of tooth eruption through reviewing various theories and clinical observations. It is proposed that tooth eruption involves alveolar bone remodeling regulated by the dental follicle, requiring bone resorption in the direction of eruption and bone formation on the opposite side. While root formation accommodates eruption, it does not cause it. Eruption speeds vary at different stages, from slow intraosseous movement to faster pre-occlusal eruption to very slow post-occlusal eruption. Understanding local bone metabolism regulation is key to managing eruption clinically.
The document discusses tooth eruption and shedding. It defines tooth eruption and describes the various stages of eruption including pre-eruptive, eruptive, and posteruptive movements. It discusses the patterns, histology, and theories of tooth eruption. Key stages include pre-eruptive tooth movements within the jaw, eruption through the bone and oral mucosa, and posteruptive movements to maintain position. Theories discussed include bone remodeling, root growth, hydrostatic pressure, and periodontal ligament traction.
This document discusses the eruption and shedding of teeth. It defines eruption as the process of a tooth moving through the alveolar bone into the oral cavity. Shedding is defined as the physiological process that eliminates the deciduous dentition. The document outlines the different patterns of tooth movement during eruption, including pre-eruptive, eruptive, and post-eruptive movement. It also discusses the histological changes that occur in the surrounding tissues to facilitate tooth eruption and shedding.
This document discusses various aspects of tooth eruption including:
- Tooth eruption involves the movement of teeth from their developmental positions in the jaws to their functional positions in the oral cavity.
- Eruption occurs in three stages - preeruptive, eruptive, and posteruptive. Key events in each stage are described.
- Several theories have been proposed to explain the mechanisms underlying tooth eruption, including root growth, alveolar bone formation, periodontal ligament traction, and vascular pressure. However, tooth eruption is now considered a multifactorial process.
- The dental follicle plays a key role in eruption through directing bone remodeling and resorption to form an eruption pathway
This document provides an overview of tooth eruption and movement. It discusses the different phases of tooth eruption including pre-eruptive, eruptive, and post-eruptive movement. It also examines various theories of tooth eruption including root formation, bone remodeling, dental follicle, and periodontal ligament theories. The document concludes with sections on shedding of deciduous teeth, patterns of shedding, and tooth resorption and repair.
This document summarizes tooth eruption, including the physiological phases and mechanisms involved. It discusses preeruptive, eruptive, and posteruptive tooth movement and the histological changes that occur during each phase, such as root formation, remodeling of the bony crypt, and traction of the periodontal ligament. Key cellular and molecular events like the roles of PTHrP, EGF, and TGF-α are outlined. The chronology of eruption of the primary and permanent dentition is presented, as well as clinical considerations like natal teeth, teething, and impacted or submerged teeth.
Cellular, Molecular, and Genetic Determinants OF Tooth Eruption /prosthodonti...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The document discusses tooth eruption and shedding. It defines tooth eruption and describes the various stages of eruption including pre-eruptive, eruptive, and posteruptive movements. It discusses the patterns, histology, and theories of tooth eruption. Key stages include pre-eruptive tooth movements within the jaw, eruption through the bone and oral mucosa, and posteruptive movements to maintain position. Theories discussed include bone remodeling, root growth, hydrostatic pressure, and periodontal ligament traction.
This document discusses the eruption and shedding of teeth. It defines eruption as the process of a tooth moving through the alveolar bone into the oral cavity. Shedding is defined as the physiological process that eliminates the deciduous dentition. The document outlines the different patterns of tooth movement during eruption, including pre-eruptive, eruptive, and post-eruptive movement. It also discusses the histological changes that occur in the surrounding tissues to facilitate tooth eruption and shedding.
This document discusses various aspects of tooth eruption including:
- Tooth eruption involves the movement of teeth from their developmental positions in the jaws to their functional positions in the oral cavity.
- Eruption occurs in three stages - preeruptive, eruptive, and posteruptive. Key events in each stage are described.
- Several theories have been proposed to explain the mechanisms underlying tooth eruption, including root growth, alveolar bone formation, periodontal ligament traction, and vascular pressure. However, tooth eruption is now considered a multifactorial process.
- The dental follicle plays a key role in eruption through directing bone remodeling and resorption to form an eruption pathway
This document provides an overview of tooth eruption and movement. It discusses the different phases of tooth eruption including pre-eruptive, eruptive, and post-eruptive movement. It also examines various theories of tooth eruption including root formation, bone remodeling, dental follicle, and periodontal ligament theories. The document concludes with sections on shedding of deciduous teeth, patterns of shedding, and tooth resorption and repair.
This document summarizes tooth eruption, including the physiological phases and mechanisms involved. It discusses preeruptive, eruptive, and posteruptive tooth movement and the histological changes that occur during each phase, such as root formation, remodeling of the bony crypt, and traction of the periodontal ligament. Key cellular and molecular events like the roles of PTHrP, EGF, and TGF-α are outlined. The chronology of eruption of the primary and permanent dentition is presented, as well as clinical considerations like natal teeth, teething, and impacted or submerged teeth.
Cellular, Molecular, and Genetic Determinants OF Tooth Eruption /prosthodonti...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
- Tooth eruption is the movement of teeth through the gums and bone to appear in the mouth and allow for proper function.
- It occurs in three phases: pre-eruptive within the bone, eruptive as it emerges through the gums, and posteruptive as it aligns fully.
- Several theories exist for the mechanism of eruption including root formation, vascular pressure, and periodontal ligament traction which recent evidence supports as the driving force.
The document summarizes the sequence of eruption of primary teeth. It begins by defining tooth eruption as the movement of a tooth from development within the jaws to its functional position in the oral cavity. It then outlines the order of eruption of primary teeth as central incisors, lateral incisors, first molars, canines, and second molars. Finally, it briefly discusses the importance of primary teeth for functions like chewing, speech development, and guiding permanent teeth into place.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
1. Tooth eruption is the movement of tooth germs from their developmental sites until they emerge into the oral cavity and reach occlusion. This movement occurs through various stages, including pre-eruptive movement before emergence and eruptive movement after emergence.
2. During pre-eruptive movement, tooth germs move in response to jaw growth through mechanisms like bodily movement and eccentric growth. They also move in relation to each other through the gobernacular canal.
3. Eruptive pre-functional movement occurs after tooth emergence and involves axial and other movements to bring teeth into occlusion. Eruptive post-functional movement allows teeth to compensate for jaw growth and occlusal wear throughout life
The document discusses the development of dentition from initiation through emergence and maturation. It describes the pre-eruptive, per-functional, and functional phases of tooth development. Eruption involves movement of the tooth from its developmental position into the mouth. Primary and permanent molars have two stages of eruption. Eruption rates differ by tooth type and involve surrounding tissues degrading and the tooth emerging.
Primary teeth, also known as baby teeth, are naturally shed and replaced by permanent teeth according to a predictable pattern. Anterior primary teeth are shed from the lingual root surface inward, while posterior primary teeth are initially resorbed at interradicular areas before being fully replaced. Genetic and local factors like pressure from erupting permanent teeth influence the timing and rate of shedding. Histologically, specialized cells called odontoclasts resorb dental tissues while the pulp and periodontium degenerate in a programmed manner. Ankylosed primary teeth fuse to bone and may become submerged, interfering with permanent tooth eruption. Retained primary teeth fail to shed by the usual age due to issues like missing permanent successors
Tooth eruption is a complex process involving three phases: preeruptive, prefunctional eruptive, and functional. During the preeruptive phase, developing teeth move within the jaw bone through bodily movement, tilting, or drifting as the jaws grow. In the prefunctional eruptive phase, teeth move from within the bone to their functional positions through both intraosseous and extraosseous movement. The final functional phase involves minor axial movements to maintain occlusion throughout life. Tooth eruption is believed to be mediated by cellular signaling between the dental follicle and surrounding bone, leading to selective bone resorption and deposition to guide eruption.
The document discusses the phases and mechanism of tooth eruption. It describes the three phases as:
1) Pre-eruptive phase where tooth germs grow and the jaw bones remodel to make space.
2) Eruptive phase where the roots form and the teeth move from their crypts to their functional positions through bone resorption and deposition guided by the periodontal ligament fibers.
3) Post-eruptive phase where teeth continue moving to accommodate growth and compensate for wear.
The key theories discussed for the mechanism of eruption are: bone remodeling around the crypt, the role of the dental follicle in providing cells for bone formation and resorption, the eruptive forces
Tooth eruption involves three phases: pre-eruptive, eruptive, and post-eruptive. In the pre-eruptive phase, tooth germs develop and move within the jaw as it grows. The eruptive phase begins with root formation and ends when teeth reach the occlusal plane. Teeth emerge through the gums via bone resorption. In the post-eruptive phase, teeth continue moving axially and mesially to accommodate jaw growth and wear. Several theories attempt to explain eruption mechanisms, including root formation, bone remodeling, dental follicle activity, and periodontal ligament traction.
Tooth eruption refers to the axial or occlusal movement of developing teeth to emerge from the jawbone and reach the biting surface in the mouth. Eruption occurs in three phases: pre-eruptive, eruptive, and post-eruptive. In the pre-eruptive phase, which begins after the tooth bell stage and ends at root formation, the tooth undergoes bodily movement or eccentric growth facilitated by bone resorption and deposition. During the eruptive phase, from root formation through emergence into the mouth, the tooth undergoes intraosseous and supraosseous movement. The post-eruptive phase involves ongoing root, ligament, and bone development as the tooth
The document discusses various aspects of tooth eruption including:
1) It describes the different stages and movements of tooth eruption including pre-eruptive, eruptive, and post-eruptive phases.
2) It discusses several theories of the mechanisms that drive tooth eruption including root elongation, bone remodeling, dental follicle signaling, and periodontal ligament contraction.
3) It explains the histological changes that occur in tissues overlying, surrounding, and underlying erupting teeth including bone remodeling and formation of the eruption pathway.
The document discusses the process of tooth eruption, which occurs in five major stages: 1) the secretory phase, 2) the intraosseous stage where root formation begins, 3) the supraosseous stage where the erupting tooth moves occlusally under the reduced enamel epithelium, 4) the tip of the crown enters the oral cavity, and 5) the tooth continues erupting occlusally until it reaches occlusion. After eruption is complete, post-eruptive tooth movement acts to maintain the tooth's position as the jaw grows and compensate for occlusal and proximal wear. References include pediatric dentistry textbooks and websites.
This document discusses tooth eruption and the mechanisms of tooth eruption. It describes the three phases of tooth eruption: preeruptive, eruptive, and functional phases. The preeruptive phase involves the tooth germ moving outward and upward/downward within the alveolar process due to jaw growth. The eruptive phase begins with root formation and ends when the tooth reaches the occlusal plane. The functional phase occurs after the tooth erupts and accommodates further root and jaw growth. Several theories are presented to explain the mechanism of tooth eruption, including vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
Tooth eruption is the movement of developing teeth through the bone and gums to emerge in the mouth. It occurs in three phases: pre-eruptive, eruptive, and functional. In the pre-eruptive phase, the tooth germ moves outward and upward/downward as the jaws grow in length, width, and height. The eruptive phase begins with root formation and ends when the tooth reaches the biting surface, involving both movement within and above the bone. Finally, in the functional phase the tooth remains in the mouth as the root and jaws continue growing.
This document discusses various theories of tooth eruption, including the root elongation theory, bone remodeling theory, periodontal ligament contraction theory, vascular pressure theory, and dental follicle theory. It provides details on each theory and their fallacies. Tooth eruption is a multifactorial process influenced by root formation, bone remodeling, the dental follicle, hydrostatic pressure in tissues, and other factors. No single theory fully explains the process, and tooth eruption likely involves elements from several theories working together.
Tooth eruption and shedding - complete packageBinaya Bhandari
Tooth eruption and shedding is a complex process involving three phases: pre-eruptive, eruptive, and post-eruptive. There are several theories for the mechanism of eruption, with the most accepted being the dental follicle theory involving bone remodeling. Primary teeth typically erupt in a set sequence between 6 months to 2.5 years and are later shed and replaced by permanent teeth according to Nolla's stages of eruption. Problems can occur during eruption like teething, eruption cysts, or ectopic/non-eruption of teeth which are typically managed through non-pharmacological or pharmacological means. Knowledge of normal eruption timing is important for treating dental issues in children
Mechanisms of Tooth Eruption & Mammalian Teeth 3 Categories on the Basis of E...Jansen Calibo
This document discusses tooth eruption, including its definition, phases, and mechanisms. It begins by defining tooth eruption as the movement of developing teeth through bone and gum tissue to emerge in the mouth. It then describes the three phases of eruption: pre-eruptive (tooth development below gum), eruptive (root formation and emergence), and post-eruptive (teeth in function). The mechanisms of eruption involve bodily movement and growth changes. Teeth can be categorized based on their eruptive characteristics as continuously growing, continuously extruding, or continuously erupting.
This document discusses tooth eruption and shedding. It begins by describing the formation of the dental lamina during embryonic development, from which the primary teeth and permanent successors develop. It then covers the developmental stages of teeth, the theories of eruption, and the phases of eruption including pre-eruption, eruption, and post-eruption. It also provides the chronology of human dentition development and shedding of teeth. In summary, it provides a comprehensive overview of tooth development from the embryonic stage through eruption and shedding.
This document discusses tooth eruption, including:
1. Tooth eruption involves the axial movement of teeth from their developmental position in the jaw bone to their functional position in occlusion.
2. There are three phases of eruption - pre-eruptive, eruptive, and post-eruptive phases. The eruptive phase involves both intraosseous and extraosseous stages as the tooth moves from within the bone to reaching the occlusal plane.
3. Several theories have been proposed to explain the mechanism of tooth eruption, including root formation theory, bone remodeling theory, periodontal ligament traction theory, and dental follicle theory. However, it is now believed
The document discusses the phases of tooth eruption and theories of tooth eruption. It describes three phases of tooth eruption: 1) the preeruptive phase where the tooth germ moves within the jaw bone, 2) the eruptive or prefunctional phase where the root forms and the tooth emerges into the mouth, and 3) the functional or post-eruptive phase where the tooth reaches the bite and the roots continue to develop. Several theories for the mechanism of tooth eruption are mentioned, including the roles of vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
Nelson Mandela fought against racism and apartheid in South Africa through non-violent protest and civil disobedience. As the leader of the anti-apartheid movement, he addressed volunteers to promote non-violence and avoid retaliation. Mandela later became the first black president of South Africa and worked to establish racial equality and dismantle the legacy of apartheid. However, racism remained deeply ingrained in South African society. Mandela advocated for brotherhood and consensus to limit apartheid and create a more just world.
This document provides an overview and instructions for applying for the PMI Agile Certified Practitioner (PMI-ACP) certification. It outlines the eligibility requirements, application process, fees, and policies regarding the certification exam.
The key eligibility requirements are: a secondary degree, 2,000 hours of general project experience in the last 5 years, 1,500 hours of agile project experience in the last 3 years, and 21 contact hours of agile training.
The application process involves completing an online application and recording experience and training details. Applications are processed within 10 business days if submitted online by an individual, or 20 business days if submitted on paper or by a corporation. The document provides guidance on accurately
- Tooth eruption is the movement of teeth through the gums and bone to appear in the mouth and allow for proper function.
- It occurs in three phases: pre-eruptive within the bone, eruptive as it emerges through the gums, and posteruptive as it aligns fully.
- Several theories exist for the mechanism of eruption including root formation, vascular pressure, and periodontal ligament traction which recent evidence supports as the driving force.
The document summarizes the sequence of eruption of primary teeth. It begins by defining tooth eruption as the movement of a tooth from development within the jaws to its functional position in the oral cavity. It then outlines the order of eruption of primary teeth as central incisors, lateral incisors, first molars, canines, and second molars. Finally, it briefly discusses the importance of primary teeth for functions like chewing, speech development, and guiding permanent teeth into place.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
1. Tooth eruption is the movement of tooth germs from their developmental sites until they emerge into the oral cavity and reach occlusion. This movement occurs through various stages, including pre-eruptive movement before emergence and eruptive movement after emergence.
2. During pre-eruptive movement, tooth germs move in response to jaw growth through mechanisms like bodily movement and eccentric growth. They also move in relation to each other through the gobernacular canal.
3. Eruptive pre-functional movement occurs after tooth emergence and involves axial and other movements to bring teeth into occlusion. Eruptive post-functional movement allows teeth to compensate for jaw growth and occlusal wear throughout life
The document discusses the development of dentition from initiation through emergence and maturation. It describes the pre-eruptive, per-functional, and functional phases of tooth development. Eruption involves movement of the tooth from its developmental position into the mouth. Primary and permanent molars have two stages of eruption. Eruption rates differ by tooth type and involve surrounding tissues degrading and the tooth emerging.
Primary teeth, also known as baby teeth, are naturally shed and replaced by permanent teeth according to a predictable pattern. Anterior primary teeth are shed from the lingual root surface inward, while posterior primary teeth are initially resorbed at interradicular areas before being fully replaced. Genetic and local factors like pressure from erupting permanent teeth influence the timing and rate of shedding. Histologically, specialized cells called odontoclasts resorb dental tissues while the pulp and periodontium degenerate in a programmed manner. Ankylosed primary teeth fuse to bone and may become submerged, interfering with permanent tooth eruption. Retained primary teeth fail to shed by the usual age due to issues like missing permanent successors
Tooth eruption is a complex process involving three phases: preeruptive, prefunctional eruptive, and functional. During the preeruptive phase, developing teeth move within the jaw bone through bodily movement, tilting, or drifting as the jaws grow. In the prefunctional eruptive phase, teeth move from within the bone to their functional positions through both intraosseous and extraosseous movement. The final functional phase involves minor axial movements to maintain occlusion throughout life. Tooth eruption is believed to be mediated by cellular signaling between the dental follicle and surrounding bone, leading to selective bone resorption and deposition to guide eruption.
The document discusses the phases and mechanism of tooth eruption. It describes the three phases as:
1) Pre-eruptive phase where tooth germs grow and the jaw bones remodel to make space.
2) Eruptive phase where the roots form and the teeth move from their crypts to their functional positions through bone resorption and deposition guided by the periodontal ligament fibers.
3) Post-eruptive phase where teeth continue moving to accommodate growth and compensate for wear.
The key theories discussed for the mechanism of eruption are: bone remodeling around the crypt, the role of the dental follicle in providing cells for bone formation and resorption, the eruptive forces
Tooth eruption involves three phases: pre-eruptive, eruptive, and post-eruptive. In the pre-eruptive phase, tooth germs develop and move within the jaw as it grows. The eruptive phase begins with root formation and ends when teeth reach the occlusal plane. Teeth emerge through the gums via bone resorption. In the post-eruptive phase, teeth continue moving axially and mesially to accommodate jaw growth and wear. Several theories attempt to explain eruption mechanisms, including root formation, bone remodeling, dental follicle activity, and periodontal ligament traction.
Tooth eruption refers to the axial or occlusal movement of developing teeth to emerge from the jawbone and reach the biting surface in the mouth. Eruption occurs in three phases: pre-eruptive, eruptive, and post-eruptive. In the pre-eruptive phase, which begins after the tooth bell stage and ends at root formation, the tooth undergoes bodily movement or eccentric growth facilitated by bone resorption and deposition. During the eruptive phase, from root formation through emergence into the mouth, the tooth undergoes intraosseous and supraosseous movement. The post-eruptive phase involves ongoing root, ligament, and bone development as the tooth
The document discusses various aspects of tooth eruption including:
1) It describes the different stages and movements of tooth eruption including pre-eruptive, eruptive, and post-eruptive phases.
2) It discusses several theories of the mechanisms that drive tooth eruption including root elongation, bone remodeling, dental follicle signaling, and periodontal ligament contraction.
3) It explains the histological changes that occur in tissues overlying, surrounding, and underlying erupting teeth including bone remodeling and formation of the eruption pathway.
The document discusses the process of tooth eruption, which occurs in five major stages: 1) the secretory phase, 2) the intraosseous stage where root formation begins, 3) the supraosseous stage where the erupting tooth moves occlusally under the reduced enamel epithelium, 4) the tip of the crown enters the oral cavity, and 5) the tooth continues erupting occlusally until it reaches occlusion. After eruption is complete, post-eruptive tooth movement acts to maintain the tooth's position as the jaw grows and compensate for occlusal and proximal wear. References include pediatric dentistry textbooks and websites.
This document discusses tooth eruption and the mechanisms of tooth eruption. It describes the three phases of tooth eruption: preeruptive, eruptive, and functional phases. The preeruptive phase involves the tooth germ moving outward and upward/downward within the alveolar process due to jaw growth. The eruptive phase begins with root formation and ends when the tooth reaches the occlusal plane. The functional phase occurs after the tooth erupts and accommodates further root and jaw growth. Several theories are presented to explain the mechanism of tooth eruption, including vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
Tooth eruption is the movement of developing teeth through the bone and gums to emerge in the mouth. It occurs in three phases: pre-eruptive, eruptive, and functional. In the pre-eruptive phase, the tooth germ moves outward and upward/downward as the jaws grow in length, width, and height. The eruptive phase begins with root formation and ends when the tooth reaches the biting surface, involving both movement within and above the bone. Finally, in the functional phase the tooth remains in the mouth as the root and jaws continue growing.
This document discusses various theories of tooth eruption, including the root elongation theory, bone remodeling theory, periodontal ligament contraction theory, vascular pressure theory, and dental follicle theory. It provides details on each theory and their fallacies. Tooth eruption is a multifactorial process influenced by root formation, bone remodeling, the dental follicle, hydrostatic pressure in tissues, and other factors. No single theory fully explains the process, and tooth eruption likely involves elements from several theories working together.
Tooth eruption and shedding - complete packageBinaya Bhandari
Tooth eruption and shedding is a complex process involving three phases: pre-eruptive, eruptive, and post-eruptive. There are several theories for the mechanism of eruption, with the most accepted being the dental follicle theory involving bone remodeling. Primary teeth typically erupt in a set sequence between 6 months to 2.5 years and are later shed and replaced by permanent teeth according to Nolla's stages of eruption. Problems can occur during eruption like teething, eruption cysts, or ectopic/non-eruption of teeth which are typically managed through non-pharmacological or pharmacological means. Knowledge of normal eruption timing is important for treating dental issues in children
Mechanisms of Tooth Eruption & Mammalian Teeth 3 Categories on the Basis of E...Jansen Calibo
This document discusses tooth eruption, including its definition, phases, and mechanisms. It begins by defining tooth eruption as the movement of developing teeth through bone and gum tissue to emerge in the mouth. It then describes the three phases of eruption: pre-eruptive (tooth development below gum), eruptive (root formation and emergence), and post-eruptive (teeth in function). The mechanisms of eruption involve bodily movement and growth changes. Teeth can be categorized based on their eruptive characteristics as continuously growing, continuously extruding, or continuously erupting.
This document discusses tooth eruption and shedding. It begins by describing the formation of the dental lamina during embryonic development, from which the primary teeth and permanent successors develop. It then covers the developmental stages of teeth, the theories of eruption, and the phases of eruption including pre-eruption, eruption, and post-eruption. It also provides the chronology of human dentition development and shedding of teeth. In summary, it provides a comprehensive overview of tooth development from the embryonic stage through eruption and shedding.
This document discusses tooth eruption, including:
1. Tooth eruption involves the axial movement of teeth from their developmental position in the jaw bone to their functional position in occlusion.
2. There are three phases of eruption - pre-eruptive, eruptive, and post-eruptive phases. The eruptive phase involves both intraosseous and extraosseous stages as the tooth moves from within the bone to reaching the occlusal plane.
3. Several theories have been proposed to explain the mechanism of tooth eruption, including root formation theory, bone remodeling theory, periodontal ligament traction theory, and dental follicle theory. However, it is now believed
The document discusses the phases of tooth eruption and theories of tooth eruption. It describes three phases of tooth eruption: 1) the preeruptive phase where the tooth germ moves within the jaw bone, 2) the eruptive or prefunctional phase where the root forms and the tooth emerges into the mouth, and 3) the functional or post-eruptive phase where the tooth reaches the bite and the roots continue to develop. Several theories for the mechanism of tooth eruption are mentioned, including the roles of vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
Nelson Mandela fought against racism and apartheid in South Africa through non-violent protest and civil disobedience. As the leader of the anti-apartheid movement, he addressed volunteers to promote non-violence and avoid retaliation. Mandela later became the first black president of South Africa and worked to establish racial equality and dismantle the legacy of apartheid. However, racism remained deeply ingrained in South African society. Mandela advocated for brotherhood and consensus to limit apartheid and create a more just world.
This document provides an overview and instructions for applying for the PMI Agile Certified Practitioner (PMI-ACP) certification. It outlines the eligibility requirements, application process, fees, and policies regarding the certification exam.
The key eligibility requirements are: a secondary degree, 2,000 hours of general project experience in the last 5 years, 1,500 hours of agile project experience in the last 3 years, and 21 contact hours of agile training.
The application process involves completing an online application and recording experience and training details. Applications are processed within 10 business days if submitted online by an individual, or 20 business days if submitted on paper or by a corporation. The document provides guidance on accurately
Debbie Stock is an experienced learning and organization development executive who has held director roles at major healthcare organizations. She specializes in designing learning programs, change management, performance management, and leadership development. References praise her innovative approaches and ability to drive positive organizational change and improvements in employee engagement and performance.
O professor da rede pública não é despreparadoGEMFILOSOFIA
O documento defende que os professores da rede pública não são despreparados, como afirmam os defensores do "conhecimento pop". Este movimento pretende desacreditar o ensino público no Brasil e considera a filosofia como algo distante da realidade, ao contrário do que defende o autor. O documento argumenta que os professores da rede pública passaram por concurso público e foram considerados os mais preparados pelo Estado.
This document summarizes an office space development project called H20 located in Greater Noida, India. It has a total land area of 21 acres and is being developed in three phases, with delivery expected in 2016. The second phase involves the construction of 6 IT/ITES towers ranging from G+14 to G+16 floors that will provide lockable furnished and unfurnished office spaces for lease. Rates for virtual office spaces, lockable spaces, furnished spaces, and cabins are provided, ranging from Rs. 5250 to Rs. 6250 per square foot. The development will include common amenities like lifts, security, cafeterias, gyms, and conference rooms. Additional charges for maintenance, electricity, parking
The document contains 16 multiple choice questions about the anatomical features and characteristics of the premolars. Some key points addressed in the questions include:
- The number and shape of cusps on the lower first premolar
- The shapes of the mesial and distal fossae on the upper first molar
- Common developmental groove patterns on the lower second molar
- Distinguishing features of the upper first and second premolars
- Variations in root canal morphology and pulp chamber features between the different premolars
This document provides information about a new commercial and residential project called Premeria including a shopping galleria, residential units, and amenities. Some key details include:
- The shopping galleria will be 2.5 lac square feet across two floors with 200 shops ranging from 203-748 square feet in size and a 23,000 square foot food court.
- Residential units will be ground + 2 floors with features like elevators, parking, and landscaping.
- Amenities will include a swimming pool, spa, gym, library, and more. Plans and specifications for electrical, plumbing, ventilation, and fire safety systems are provided.
- Payment plans and location maps are
Kings valley gnw cs bharti_real_estate pramod mishra9899290531Pramod Mishra
Dewa Group is developing a residential project called Kings Valley in Greater Noida West, India. The project will have 421 units across 1BHK, 2BHK, 2BHK+Study, and 3BHK configurations ranging from 566-1370 square feet. Amenities will include a swimming pool, gym, clubhouse, and landscaped gardens. The project is located near highways and metro lines for good connectivity. Units will have specifications like earthquakeresistant structures, solar panels, modern finishes and fixtures. Payments plans with 10% booking amount and balance in installments are offered.
H2 o premeria (1)9899290531 pramod@csbharti.comPramod Mishra
This document provides information about a new commercial and residential real estate development called Premeria by Imperia Structures. It will include a large shopping galleria with over 200 shops across two floors, a multiplex cinema, restaurants, parking, and amenities like a clubhouse with a pool and gym. Floor plans and unit specifications are provided along with payment plans and rates for the retail and commercial spaces. A location map is also included.
The document discusses various anatomical features of different teeth including molars, premolars, cusps, roots, occlusal surfaces, developmental grooves, curves of occlusion, and relationships between teeth in centric occlusion. Key points covered include the shapes of occlusal surfaces, numbers of roots and root canals, dates of eruption, elevations and fossae on occlusal surfaces, differences between deciduous and permanent teeth, and which teeth contact each other in centric occlusion.
This document contains an exam for a course on human dentition. It includes multiple choice questions testing knowledge of tooth anatomy and features. It also includes questions requiring short answers about tooth roots, eruption times, occlusal surfaces, and definitions. Additionally, it asks the test taker to illustrate and describe the occlusal surface of a lower second molar and the parabolic curve of the dental arch. The exam evaluates both recognition and recall of key concepts in human tooth morphology.
Dewa Group is developing a residential project called Kings Valley in Greater Noida West, India. The project will have 421 units across 1BHK, 2BHK, 2BHK+Study, and 3BHK configurations ranging from 566-1370 square feet. Amenities will include a swimming pool, gym, clubhouse, and landscaped gardens. The project is located near highways and metro lines for good connectivity. Units will have specifications like earthquakeresistant structures, solar panels, modern finishes and fixtures. Payments plans with 10% booking amount and balance in installments are offered.
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This document from Nahda University's Faculty of Oral and Dental Medicine contains 3 physiology assignment questions for dental students asking them to describe in their own words: 1) the hypothesis that explains referred pain, 2) the regulatory mechanisms involved in thermoregulation, or 3) the hypothesized steps involved in addiction to morphine using receptor theory.
The document contains 25 multiple choice questions about dental anatomy and features of various teeth, primarily the upper and lower first permanent molars. Key details tested include the location of the cusp of Carabelli, geometric shapes of occlusal surfaces, number and types of roots and root canals, sizes of cusps, and fossae patterns. Overall, the questions assess knowledge of identifying and distinguishing characteristics of different teeth.
Spelling Rules Presentation By Dr. Shadia Yousef BanjarDr. Shadia Banjar
The document outlines several spelling rules in English:
1. It discusses rules for doubling consonants, using "ie" vs "ei", and exceptions like words ending in "ce" or "ge".
2. Suffix rules are explained, like dropping the silent "e" or changing the "y" to "i" depending on the preceding letter.
3. Exceptions to these suffix rules are also provided, like keeping the "e" in words like "judgment".
4. Final rules address doubling consonants in one-syllable or accented words, and words ending in consonant-vowel-consonant combinations.
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This document summarizes the process of tooth eruption. It discusses the pre-eruptive, eruptive, and post-eruptive phases of tooth movement. During the pre-eruptive phase, tooth germs move within the jaw before eruption. The eruptive phase involves tooth movement from within the bone to the oral cavity. Post-eruptive movements maintain tooth position as the jaws grow. Theories on the mechanisms controlling eruption and resorption are also presented, along with cellular and molecular factors such as the dental follicle that regulate eruption.
This document discusses physiologic tooth movement including eruption and shedding. It describes the three phases of tooth movement: preeruptive, eruptive, and posteruptive. Preeruptive movement occurs before eruption as tooth germs shift within the jaw. Eruptive movement brings teeth into occlusion from within bone. Posteruptive movement maintains tooth position as jaws grow. Theories for the mechanisms driving eruption include root growth, bone remodeling, periodontal ligament traction, and vascular pressure. Tooth eruption follows a chronological sequence in both the primary and permanent dentitions.
Tooth eruption is a continuous process involving three phases - preeruptive, eruptive, and posteruptive. During the eruptive phase, teeth emerge through the gums in four stages: root formation, movement, penetration, and occlusal contact. Primary teeth are eventually shed and replaced by permanent teeth during the transition from primary to mixed to permanent dentition. Tooth eruption involves constant movement of developing crowns, root formation, bone remodeling by the dental follicle, and traction from the periodontal ligament. Posteruptive movement further accommodates jaw growth and compensates for tooth wear through alveolar bone formation.
Functional development of dental arches and occlusion /certified fixed orth...Indian dental academy
The document discusses the development of dental occlusion from birth to adulthood. It summarizes that the process involves complex interactions between tooth morphology, muscle functions, bone growth, and forces. It then outlines the key factors that influence occlusion development in more detail, including: bone and tooth relationships, functional eruption, intraoral forces like from muscles and occlusal forces from opposing teeth. It notes that bone adapts to functional forces based on Wolff's law and discusses theories around how various factors guide the intricate process of dental occlusion development.
Tooth eruption is a complex process involving the movement of teeth from their development position in the jawbone to their functional position in the mouth. The key structures involved are the root follicle, periodontal membrane, and crown follicle. Multiple theories have been proposed to explain the mechanism of eruption, including root formation theory, vascular pressure theory, and dental follicle theory. Clinically, natal and neonatal teeth as well as eruption cysts can occur during the eruption process.
This document provides an overview of tooth eruption and shedding. It discusses the different types of dentition, the phases of eruption including pre-eruptive, eruptive, and posteruptive. It outlines the histological changes and various theories of eruption mechanisms. Factors that can affect the eruption process like genetics, hormones, local causes and systemic disorders are also mentioned. The document concludes with discussing clinical problems during eruption and the definition and causes of tooth shedding.
The document discusses the eruption and shedding of deciduous teeth. It covers:
1) The process of eruption where a tooth moves from its developmental position in the jaw to its functional position in the mouth.
2) Pre-eruptive, eruptive, and post-eruptive phases of tooth movement.
3) Patterns and mechanisms of shedding deciduous teeth, including root resorption and the role of developing permanent teeth.
This document discusses tooth eruption patterns and calcification. It describes the pre-eruptive, eruptive, and post-eruptive phases of tooth development and eruption. The eruptive phase involves root formation, movement within the bone, penetration of the gums, and occlusal contact. Primary teeth typically erupt between ages 2-6 years, mixed dentition from 6-12 years, and permanent dentition after age 12. Theories on the mechanisms of eruption include root formation, bone remodeling directed by the dental follicle, and traction from the periodontal ligament. Compensatory movements after eruption accommodate jaw and tooth surface growth.
This ppt describes about how teeth erupts into oral cavity from within jaws and various theories to explain the mechanism followed by various factors affecting eruption
Deciduous and permanent teeth Eruption time and sheddingAkram bhuiyan
This document discusses the process of tooth eruption through various stages from development within the jawbone to functional positioning in the mouth. It describes three main stages of eruption: preeruptive within the bone, eruptive bringing the tooth through the gum, and posteruptive after it has reached the occlusal plane. The key theories discussed for what drives eruption include root growth, alveolar bone formation/remodeling, traction from the periodontal ligament, and vascular pressure within dental tissues. Experimental evidence suggests the dental follicle and subsequent periodontal ligament play important roles in directing eruption through their effects on surrounding bone.
This document discusses delayed tooth eruption (DTE). It defines various types of DTE and outlines the normal process of tooth eruption. It identifies several potential local and systemic causes of DTE, including supernumerary teeth, ankylosed deciduous teeth, premature loss of deciduous teeth, arch length deficiencies, nutritional deficiencies, endocrine disorders, and genetic syndromes. The document also provides details on the typical chronology and sequence of primary and permanent tooth eruption.
Tooth eruption and shedding involve complex movements of teeth through bone and tissue as the primary and permanent dentitions develop and replace each other. There are three phases of tooth eruption - pre-eruptive, eruptive, and post-eruptive - which involve remodeling of bone and surrounding tissues. The primary teeth are shed and replaced by the permanent teeth due to progressive root resorption caused by the erupting permanent tooth buds applying pressure and inducing resorption. The periodontal ligament contraction theory is currently the most accepted explanation for the mechanism of tooth eruption.
Development of dentiton and occlusion dr ajay srinivasDr. AJAY SRINIVAS
This document discusses dental development from prenatal to adulthood. It covers prenatal tooth development, the neonate mouth, primary tooth eruption and occlusion. The mixed dentition period involves the first and second transitional periods as permanent teeth replace primary teeth. Factors affecting occlusion such as genetics and trauma are examined. Permanent tooth development and occlusion are also summarized.
The document discusses the phases of tooth eruption. It describes three phases: preeruptive phase where the tooth germ moves within the alveolar process before root formation; eruptive phase where the root starts to form and the tooth emerges into the oral cavity; and functional phase where the tooth reaches the biting surface and accommodates jaw growth. It also discusses several theories for the mechanism of tooth eruption, including vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
This document provides an overview of alveolar bone. It discusses the development, anatomy, histology, radiographic features, and pathologies of alveolar bone. Alveolar bone forms the bony housing for teeth and provides attachment for the periodontal ligament. It develops during fetal growth via intramembranous ossification. Anatomically, it consists of cortical plates and inner cancellous bone with trabeculae. Histologically, it is composed of osteoblasts, osteocytes, and osteoclasts. Common pathologies involving alveolar bone loss include periodontal disease, trauma from occlusion, and systemic factors like osteoporosis.
Functional development of dental arches and occlusion /certified fixed orthod...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
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Tooth eruption involves three phases:
1. The pre-eruptive phase involves tooth germ development and movement within the jaw bone.
2. The eruptive phase is when the tooth emerges into the mouth through the gums and reaches the bite.
3. The post-eruptive phase occurs after the tooth has reached the bite, and involves minor movements like accommodating jaw growth and bite wear.
Tooth eruption is guided by several theories centered around root formation, bone remodeling, the dental follicle, and ligament and blood vessel forces, but is likely multifactorial. Clinical considerations for eruption include early or delayed timing.
Development of dentition & occlusion /certified fixed orthodontic courses by ...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
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Dental factors affecting occlusal development
The final form of the occlusion and position of the teeth exhibits a wide range of variation. The main factors responsible for producing this variation can be divided into two groups, the first group containing major factors which have a general effect on the occlusion and which play a part in the development of every occlusion.General factors affecting occlusal development 1 Skeletal factors. The size, shape and relative positions of the upper and lower jaws. 2 Muscle factors. The form and function of the muscles which surround the teeth, i.e. the muscles of the lips, cheeks and tongue. 3 Dental factors. The size of the dentition in relation to the size of the jaws.
The size of the dentition in relation to jaw size The third major factor affecting the development of the occlusion of the teeth is the relationship between the size of the dentition and the size of the jaws which have to accommodate the teeth. Ideally, there should be adequate space for the teeth to erupt into the mouth without crowding or overlap. In the primary dentition, actual overlapping of the teeth is unusual, and a disproportion between jaw size and tooth size is usually manifested as a lack of spacing rather than as actual crowding.In the permanent dentition, however, crowding of the teeth is much more common.
The etiology of dental arch crowding has been the subject of several theories. It has been suggested that there is an evolutionary trend towards a diminution in size of the jaws without a corresponding diminution in tooth dimensions. It has also been suggested that dietary factors may be involved, the modern diet needing less chewing and therefore providing less stimulus to jaw growth than the more primitive diets. There is little evidence to support this theory. A further theory postulates that present-day populations represent a mixture of peoples from various ethnic backgrounds, and such interbreeding of people with different physical characteristics leads to skeletal and dental disharmonies.
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This presentation is a curated compilation of PowerPoint diagrams and templates designed to illustrate 20 different digital transformation frameworks and models. These frameworks are based on recent industry trends and best practices, ensuring that the content remains relevant and up-to-date.
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2. Tooth eruption is traditionally considered to be a developmental process whereby the tooth
moves in an axial direction from its location within the alveolar crypt of the jaw into a functional
position within the oral cavity.
Tooth eruption is a more general process, however, which includes certain posteruptive tooth
movements. These movements following eruption are those made by the tooth after it has
reached its functional position in the occlusal plane. They may be divided into three categories:
(1) movements made to accommodate the growing jaws,
(2) those made to compensate for continued occlusal wear, and
(3) those made to accommodate interproximal wear.
This article examines the possible mechanisms of tooth eruption. Remarkably, for so basic a
process, the mechanisms of tooth eruption are not well understood. Numerous theories of
tooth eruption have been proposed. These theories have involved almost all of the tissues in or
near an erupting tooth. None of the theories can alone account for all of the movements made
by a tooth during its lifetime. In order to be clinically valid, a theory of tooth eruption must
accommodate the following observations about the eruptive process:
(1) teeth are moved in three dimensions of space,
(2) teeth arrive at a functional position that is heritable, and
(3) teeth erupt at varying, characteristic stage-specific speeds.
3. .....
First we will briefly review theories that are not serious contenders to satisfactorily explain
tooth eruption.
1. Vascular pressure and blood vessel thrust. It is known that the teeth move in their sockets in
synchrony with the arterial pulse, so local volume changes can produce limited tooth
movement. Furthermore, spontaneous changes in blood pressure have been shown to influence
eruptive behavior. Ground substance can swell from 30% to 50% by retaining additional water,
so this to could create pressure. But since surgical excision of the growing root and associated
tissues eliminates the periapical vasculature without stopping eruption, this means that the
local vessels are not absolutely necessary for tooth eruption.
2. Pulpal pressure and pulpal growth. This theory says that the force exerted by the growth of
cells is the result of multiplication of cells--analogous to the roots of a growing plant forcing
pebbles aside. Yet, when a developing tooth is surgically removed and replaced by a silicone
replica, that replica will erupt provided that the dental follicle is retained.
3. Traction by periodontal fibroblasts. Administration of lathyrogens show no disruption of the
eruption of teeth in experimental animals. Lathryogens are drugs that specifically inhibit the
formation of collagen crosslinks. The implication is that the eruptive force is unlikely to involve a
tractional element that pulls the tooth toward the oral cavity.
.....
In this next section, we review the theories that provide the most convincing data to explain
tooth eruption in man and other mammalian species. These should be seriously considered.
4. 1. Root elongation. Root formation would appear to be the obvious cause of tooth eruption
since it undoubtedly causes an overall increase in the length of the tooth along with the crown
moving occlusally. Yet, clinical observation, experimental studies, and histologic analysis argue
strongly against such a conclusion. Remarkably, rootless teeth do erupt. This is most obvious in
cases of dentin dysplasia Type I and following irradiation. Some teeth erupt a greater distance
than the total length of their roots, and teeth will still erupt after the completion of root
formation or when the tissues forming the root--the apical papilla, Hertwig's epithelial root
sheath, and periapical tissue--are surgically removed.
2. Alveolar bone remodeling. Alveolar bone growth, tooth development, and eruption of the
teeth are interdependent. It is observed that the alveolar process forms during tooth
development and is locally deficient in sites where primary or permanent teeth fail to develop.
Similarly, alveolar bone loss is a consistent clinical finding in the edentulous patient.
Formation of bone apical to developing teeth has long been proposed as one mechanism for
eruption. There is no doubt that bone forms in these sites, but bone formation per se is not
sufficient for tooth eruption. A good example to illustrate this is the presence of an unerupted
dentition in osteopetrotic mutation in which bone formation is nearly normal or elevated and
bone resorption greatly reduced. Osteopetrosis, sometimes called 'marble bones' is
disseminated condensing osteopathy, a genetic disorder marked by bone sclerosis or defective
skeletal remodeling. The same applies for cases of cleidocranial dysotosis in which deciduous
teeth erupt and persist while permanent teeth erupt late or ectopically. Cleidocranial dysotosis
is a familial disease characterized by abnormalities of the skull, teeth, and jaws.
Alveolar bone growth involving turnover (resorption and formation) is required during tooth
eruption. Bone resorption and bone formation are polarized around erupting teeth. These
metabolic events depend upon the adjacent parts of the dental follicle. Thus, it appears that
tooth eruption is a localized, bilaterally symmetrical event in alveolar bone that is regulated by
the dental follicle proper, a derivative of cranial ectomesenchyme (neural crest).
The strengths of this theory lie in explanations for the early events of tooth eruption since part
of the follicle is lost after mucosal penetration. Nevertheless, the periodontal ligament,
cementum, and alveolar bone proper are derivatives in part of the follicle, so that later events
could be controlled by these and other related tissues. Then dental follicle proper is the thin,
dense, ectomesenchymeal connective tissue investment of a developing tooth which surrounds
the enamel organ.
5. The fact that active eruption begins only after crown formation is complete suggests a role also
for the enamel organ and its proteases in the early signaling of eruption. In addition, the
proximity of the enamel organ and the dental follicle and their tight adherence in surgical
manipulations indicate that many effects attributed above to the dental follicle proper may
indeed be events initiated or controlled by the enamel organ or the reduced enamel epithelium.
If this is the case, tooth eruption may be yet another example of collaborative epithelialmesenchymal interactions in development.
3. Periodontal ligament. Formation and renewal of the periodontal ligament is associated with
the continuous eruption of permanently growing rodent incisors. (Note well: continuously
growing rat incisors are different than human teeth that have a limited period of growth.)
For teeth with a limited period of growth, the presence of a periodontal ligament does not
assure eruption. In the case of osteopetrotic mutations, a periodontal ligament is present, but
teeth do not erupt. Therefore, the periodontal ligament cannot be essential for tooth eruption
in man. Its role has been largely overstated due to experiments performed on continuously
erupting rodent teeth.
.....
II. Clinical and Experimental Data on Tooth Eruption
Developing teeth must erupt through diverse mineralized and unmineralized connective tissues.
This movement requires resorption of bone, and often roots of primary teeth, in the direction of
movement and formation of bone and roots in the opposite direction. The height of the alveolar
process increases during eruption, and there are regional differences in the rates of growth
during this period.
6. In 1944 Carlson published a comprehensive radiographic analysis of the eruption of different
types of permanent teeth. He showed that for the human permanent premolars:
1) eruption begins only after crown formation in complete,
2) root formation occurs initially at the expense of basal bone without movement of the crown,
3) most root growth occurs during the stage of rapid preocclusal eruption to the occlusal plane,
4) the completion of the root, like its initial growth, is at the expense of basal bone, and
5) teeth continue to erupt slowly or move with growth of the alveolar process throughout life.
Use of metallic implants on facial bones to serve as fixed reference points studied in a series of
sequential radiographs has shown that differential growth of the jaws produced a rotation
around a center in their anterior part. Remodeling of the inferior border of the mandible
obscured much of this differential growth in jaws traced without internal reference points.
These positional changes of the jaws during the period of tooth eruption mean that most
erupting teeth must fit into a rotating occlusal plane while moving between and amongst their
neighbors. With this formidable complexity. one is hardly surprised that tooth eruption is
sometimes ectopic.
.....
III. Preeruptive Movements of Developing Teeth
During crown development, small preeruptive random movements of the forming tooth do
occur. Whether they are mediated by the follicular events accompanying eruption or reflect
7. regional differences in the growth and maturation of the jaws is not known. At any rate, these
small movements of the developing crown are local and are not in the direction of eruption.
Premolar tooth germs develop initially lingual to the crowns of the primary molars. Later, when
the primary molars erupt, they move labially to grow and erupt in the interradicular space of
primary molars.
.....
IV. The Interosseous Stage of Eruption
All teeth develop within the alveolar bone of the jaws. The challenge of the intraosseous stage
of tooth eruption is to escape from the bone surrounding the crown and to redirect the growth
of the alveolar bone proper to surround and support a developing root. The former involves
bone resorption and the latter bone formation on opposite sides of the erupting tooth. These
activities have been shown to depend upon the adjacent parts of the true dental follicle.
Studies in nonhuman primates have shown that rootless teeth can erupt and that the follicle is
important in eruption. Damage to the follicle was the most reliable predictor of failed eruption
in transplantation studies.
In periods of rapid root growth, bone formation occurs primarily in furcation areas. Bone growth
in the apical region occurs only if root growth is not fast enough to keep up with eruption. The
rate of eruption is the rate of formation of the eruption pathway and its coordination with bone
formation in selected areas of the crypt and the alveolar crest. Since rootless teeth can erupt,
foot formation is not considered the prime mover in tooth eruption.
Movement of the tooth through bone requires a coordinated resorption and formation of bone,
that this process can be plastic, and asymmetrical to accommodate root growth and tooth drift,
and that these metabolic events likely begin in the enamel epithelia and are continued and
coordinated by the dental follicle.
8. .....
V. Mucosal Penetration and Preocclusal Eruption
Formation of the eruption pathway is completed soon after the cusps reach the alveolar crest.
At this point, the rate of eruption accelerates. As the erupting tooth approaches the surface
epithelium, there is a thickening and transformation of the enamel epithelium and fusion with
the oral epithelium.
A major accomplishment of mucosal penetration is formation of the junctional epithelium on
the tooth surface. The epithelial attachment (to the mineralized tooth surface) is continually
renewed over the tooth surface during eruption.
Preocclusal eruption from gingival emergence to the occlusal plane is accomplished by root
growth and formation of bone at the base of the crypt. Since the alveolar crest is itself growing
in height, the tooth must overtake this growth and continue eruption.
.....
VI. Eruption at the Occlusal Plane
Once the occlusal plane is approached, tooth eruption slows dramatically but continues at a
slow pace through the fifth decade of life. Eruption to the occlusal plane is accomplished by root
growth and formation of bone at the base of the crypt and/or alveolar septa. Teeth continue to
erupt through later decades, and occlusal wear may be in part compensated for by cemental
apposition. The position of the alveolar crest appears to be constant in relation to the tooth,
though obscured by periodontal bone loss.
.....
9. VII. Speeds of Tooth Eruption
Erupting teeth move at different speeds at different times. Initially, eruption is slow in bone. If
there are prolonged delays, ankylosis of tooth to bone can result. The rate of eruption increases
as the tooth is released from bone, penetrates the mucosa, and becomes very slow as it
approaches the occlusal plane. These shifts in speed are also seen in root formation. It is fast at
first, slows as the apical foramen narrows, and is very slow thereafter.
.....
VIII. Basic Principles in Tooth Eruption
Active tooth eruption begins in an interosseous environment. Bone resorption, necessary for
eruption, is regulated by the dental follicle. Like bone resorption, alveolar bone formation
associated with tooth eruption depends upon the dental follicle and is associated with high cell
proliferation. The basic principles of tooth eruption can be summarized as follows:
(1) Any region of a dental follicle has the potential for initiating and regulating bone resorption
and bone formation or for not influencing bone metabolism.
(2) Movement of teeth during eruption consists of preparing a path through bone or soft tissues
and moving them along this path. There is a failure of eruption when an eruption pathway has
not been formed.
(3) Root formation is accomodated during tooth eruption and is a consequence, not a cause of
the process.
(4) Bone formation and root formation move an erupting tooth through the oral epithelium and
into its position within the dental arch at the occlusal plane. It is unlikely that the periodontal
ligament contributes substantially to eruption, but may have a role late in the process. Bone
formation and possibly formation of apical cementum maintain a slow eruptive movement
10. throughout the life of the tooth.
.....
IX. Summary
The key to the successful clinical management of tooth eruption consists of understanding that
this process consists largely of the local regulation of alveolar bone metabolism to produce bone
resorption in the direction of eruption and shift and formation of bone at the opposite side. Our
ability to selectively and discretely affect these process at present is limited and includes the
local stimulation by extraction of a primary tooth or surgical removal of bone and assisting
mucosal penetration by incising the gingiva. More understanding of the molecular basis may
offer new clinical options in the future.