The document discusses clinical considerations in tooth development. It outlines four key signaling pathways - BMP, FGF, SHH, and Wnt - that are critical for proper tooth development. Disruption of these pathways can lead to developmental defects of enamel, dentin, and cementum. The document also reviews genetic and molecular factors involved in stages of tooth development including bud formation, crown patterning, root formation, and mineralization.
This document discusses the stages of odontogenesis, or tooth development. It describes the five main stages of growth: initiation, proliferation, histodifferentiation, morphodifferentiation, and apposition. Key structures that form during these stages include the dental lamina, dental sac, dental organ comprising the inner and outer dental epithelium and stellate reticulum, and the dental papilla. Cells in these structures differentiate into formative cells that build the tooth structures, such as ameloblasts forming enamel and odontoblasts forming dentin. The shape of the tooth crown is determined during morphodifferentiation by the membrana preformativa.
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.
The document summarizes the process of primary tooth shedding and replacement by permanent teeth. It describes how odontoclasts, cells similar to osteoclasts, initiate root resorption through secretion of acids and enzymes. This causes dissolution of the dental hard tissues and degradation of the organic matrix. Shedding occurs through intermittent periods of root resorption by odontoclasts and recovery periods where tissues are repaired, until the tooth is loosened and lost.
The periodontal ligament is a dense fibrous tissue that connects teeth to the alveolar bone. It is composed primarily of collagen fibers arranged in bundles and a ground substance containing cells, blood vessels and nerves. The collagen fibers provide structural support and allow the teeth to withstand functional forces. Fibroblasts are the main cell type and are responsible for collagen synthesis and remodeling. Blood vessels supply the ligament with nutrients. The periodontal ligament functions to attach teeth to the alveolar bone and helps maintain the teeth in their proper functional positions.
This document discusses tooth shedding, or the process by which primary teeth are replaced by permanent teeth. It defines shedding as the physiological process by which deciduous teeth are resorbed and lost to make way for successor teeth. Key points covered include the factors affecting shedding like pressure from erupting permanent teeth and genetic factors; the histology of shedding involving resorption of dental hard and soft tissues; the typical pattern of shedding from anterior to posterior teeth; and potential abnormalities in shedding like retained, submerged, or residual primary teeth.
The dentogingival junction is the region where the tooth is attached to the gingiva. It initially forms with the emergence of the tooth into the oral cavity, with the enamel covered by epithelium. Over time, the junction shifts apically as the epithelium separates from the enamel surface in a process called passive eruption. The junctional epithelium, which is more permeable, eventually attaches at the cementoenamel junction. In unhealthy conditions, the junction and sulcus can shift further onto the root surface, forming a pathological periodontal pocket.
The document discusses impression materials and techniques used in orthodontics. It describes how impressions are used to create positive casts for study, appliance fabrication, and record keeping. Alginate is the most commonly used irreversible hydrocolloid impression material due to its flexibility, accuracy, affordability, and minimal equipment needs. Proper manipulation of alginate is required to avoid voids, distortion, and other defects. Mandibular impressions should be made first to reduce patient discomfort. Impressions must be disinfected and poured immediately to minimize dimensional changes. With proper technique, alginate can provide accurate impressions for orthodontic treatment.
This document discusses the stages of odontogenesis, or tooth development. It describes the five main stages of growth: initiation, proliferation, histodifferentiation, morphodifferentiation, and apposition. Key structures that form during these stages include the dental lamina, dental sac, dental organ comprising the inner and outer dental epithelium and stellate reticulum, and the dental papilla. Cells in these structures differentiate into formative cells that build the tooth structures, such as ameloblasts forming enamel and odontoblasts forming dentin. The shape of the tooth crown is determined during morphodifferentiation by the membrana preformativa.
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.
The document summarizes the process of primary tooth shedding and replacement by permanent teeth. It describes how odontoclasts, cells similar to osteoclasts, initiate root resorption through secretion of acids and enzymes. This causes dissolution of the dental hard tissues and degradation of the organic matrix. Shedding occurs through intermittent periods of root resorption by odontoclasts and recovery periods where tissues are repaired, until the tooth is loosened and lost.
The periodontal ligament is a dense fibrous tissue that connects teeth to the alveolar bone. It is composed primarily of collagen fibers arranged in bundles and a ground substance containing cells, blood vessels and nerves. The collagen fibers provide structural support and allow the teeth to withstand functional forces. Fibroblasts are the main cell type and are responsible for collagen synthesis and remodeling. Blood vessels supply the ligament with nutrients. The periodontal ligament functions to attach teeth to the alveolar bone and helps maintain the teeth in their proper functional positions.
This document discusses tooth shedding, or the process by which primary teeth are replaced by permanent teeth. It defines shedding as the physiological process by which deciduous teeth are resorbed and lost to make way for successor teeth. Key points covered include the factors affecting shedding like pressure from erupting permanent teeth and genetic factors; the histology of shedding involving resorption of dental hard and soft tissues; the typical pattern of shedding from anterior to posterior teeth; and potential abnormalities in shedding like retained, submerged, or residual primary teeth.
The dentogingival junction is the region where the tooth is attached to the gingiva. It initially forms with the emergence of the tooth into the oral cavity, with the enamel covered by epithelium. Over time, the junction shifts apically as the epithelium separates from the enamel surface in a process called passive eruption. The junctional epithelium, which is more permeable, eventually attaches at the cementoenamel junction. In unhealthy conditions, the junction and sulcus can shift further onto the root surface, forming a pathological periodontal pocket.
The document discusses impression materials and techniques used in orthodontics. It describes how impressions are used to create positive casts for study, appliance fabrication, and record keeping. Alginate is the most commonly used irreversible hydrocolloid impression material due to its flexibility, accuracy, affordability, and minimal equipment needs. Proper manipulation of alginate is required to avoid voids, distortion, and other defects. Mandibular impressions should be made first to reduce patient discomfort. Impressions must be disinfected and poured immediately to minimize dimensional changes. With proper technique, alginate can provide accurate impressions for orthodontic treatment.
This document provides details on the structure and composition of enamel. It notes that enamel is the hardest tissue in the body, covering the anatomical crown. It is made up primarily of hydroxyapatite crystals arranged in enamel prisms/rods from the dentin-enamel junction to the surface. The direction of the prisms changes in a sinusoidal pattern. Between the prisms is interprismatic enamel. Near the surface is aprismatic enamel which is more highly mineralized. Throughout life, the crown is covered by an organic layer or integument.
BE UPDATE TO IT,, AS IT IS 3 years back from 2017
Kindly mail me if you feel, needy of this presentation
you can find my mail id @ slide share,,, if not mail me @
sukesh3567@gmail.com.
Good luck
This document discusses genetics in tooth development. It begins with an introduction to the stages of tooth development from initiation to root formation. It describes the molecular control of tooth development including key genes such as Msx1, Pax9, Lef1, and Dlx genes. Tooth morphogenesis is controlled by the enamel knot through genes such as Bmp4. The roles of genes in enamel formation including AMELX, ENAM, KLK4 and MMP20 are discussed. Genetics of dentin formation including the role of the DSPP gene in dentinogenesis imperfecta are also summarized. The document provides an overview of the molecular genetics underlying tooth development and malformations.
THEORIES OF ERUPTION
ERUPTION SEQUENCE
PHYSIOLOGY OF TOOTH ERUPTION
CELLULAR BASIS
MOLECULAR BASIS
PRODUCTION OF OSTEOCLAST
ANOMOLIES OF TOOTH ERUPTION
This document discusses procedures for boxing master impressions and making master casts. It describes two methods for boxing maxillary impressions using either pumice and plaster or wax rods and strips. For mandibular impressions, a layer of adhesive or wax is applied to the impression border before adding a wax land and boxing wax enclosure. Master casts are poured in stone, trimmed with a 4-6mm peripheral roll and notches added for remounting. Landmarks like the incisive papilla and retromolar pad midpoint are marked on casts.
This document provides information on cementum, including its definition, physical characteristics, chemical composition, formation (cementogenesis), classification, functions, anomalies, and clinical considerations. Cementum is the mineralized tissue covering tooth roots. It is softer than dentin and lacks enamel's luster. Cementum formation involves acellular and cellular stages. Cementum attaches the periodontal ligament fibers to the tooth root and allows for tooth repair. Abnormalities include hypercementosis, ankylosis, and cementomas. Cementum is an important part of the periodontium that aids in tooth attachment and repair.
The document discusses the use of spacer wax in dental impressions. It describes the objectives of using spacer wax as providing relief to tissue and controlling the thickness of impression material. Spacer wax thickness can vary according to tissue attachment and load bearing capacity. The document also discusses different spacer wax designs, classifications, and guidelines for using spacer wax and tissue stops in selective pressure impression techniques.
Cementum is the mineralized tissue covering tooth roots. It consists of inorganic minerals like hydroxyapatite and organic materials like collagen. Cementum forms through cementogenesis, led by cementoblasts. There are two stages of cementogenesis - matrix formation where cementoblasts lay down an unmineralized matrix, and mineralization where crystals are deposited. Cementum can be classified as acellular or cellular based on the presence of cementocytes, and primary or secondary based on formation time. Cementum functions to attach teeth to bone and allows for adaptation.
The dental pulp contains zones including the odontoblastic zone, cell-free zone, and cell-rich zone. Principal cells include odontoblasts that synthesize dentin, fibroblasts that form the pulp matrix, and immune cells. Blood vessels enter the pulp and branches form capillaries. Nerves form the Raschkow plexus near the odontoblasts. The pulp provides nutrients and sensation to the tooth.
This document provides an overview of the anatomy, histology, development and clinical implications of alveolar bone. It describes the components and cellular makeup of bone, including osteoblasts, osteocytes and osteoclasts. It explains that the alveolar process develops with tooth eruption and is resorbed after tooth loss. Factors that regulate bone formation and resorption are discussed. The document also outlines how alveolar bone is affected by tooth loss, orthodontic forces and non-functioning teeth.
The document discusses the alveolar bone, including its definition, components, development, structure, clinical applications, and appearance on x-rays. It notes that the alveolar bone contains the tooth sockets and supports the teeth. The alveolar bone proper surrounds the tooth root and is perforated by Volkmann's canals. The supporting alveolar bone consists of cortical plates and spongy bone between the plates and alveolar bone proper. The alveolar bone undergoes remodeling and modeling during tooth movement and in response to functional forces.
ANATOMICAL LANDMARKS OF EDENTULOUS MAXILLAAamir Godil
This document discusses the anatomical landmarks of the maxilla that are important for complete denture construction. It defines stress bearing areas, relief areas, and limiting areas. Stress bearing areas include the postero-lateral slopes of the hard palate, residual alveolar ridge, rugae, and maxillary tuberosity. Relief areas are the incisive papilla, mid-palatine raphae, zygomatic process, sharp spiny spicules, torus palatinus, and cuspid eminence. Limiting areas are the labial frenum, labial vestibule, buccal frenum, buccal vestibule, anterior and posterior vibrating lines,
Cementum is the mineralized tissue covering dental roots. It begins at the cementoenamel junction and continues to the root apex. Cementum provides attachment for collagen fibers (Sharpey's fibers) that bind the tooth to surrounding structures. Cementum develops in two stages: the prefunctional stage involving matrix formation and mineralization, and the functional stage where cementum deposition continues throughout life in response to tooth movement and wear. Cementum comes in various forms classified by development, cellularity, and fiber origin and includes acellular, cellular, intrinsic and extrinsic fiber cementum.
The pulp is a soft connective tissue located within the tooth. It has several unique features, including being surrounded by rigid dentin walls and susceptible to changes in pressure. The pulp contains odontoblasts, fibroblasts, undifferentiated cells, and defense cells. It is highly vascularized and innervated. During development, dental papilla forms the pulp through proliferation and differentiation of cells. The pulp cavity is divided into coronal and radicular regions. Nerves and blood vessels enter through the apical foramen, supplying the pulp.
Cementum is the calcified tissue that forms the outer layer of the tooth root. There are two main types of cementum: acellular and cellular. Acellular cementum covers the cervical third of the root and lacks cells. Cellular cementum forms after the tooth reaches the occlusal plane and contains cementocytes within lacunae. Cementum is composed primarily of collagen fibers and undergoes continuous deposition throughout life, increasing thickness especially in the apical region to compensate for tooth eruption and attrition.
This document provides an introduction to operative dentistry. It defines operative dentistry as dealing with the functional and esthetic restoration of teeth. The main indications for operative procedures are then outlined, including dental caries, non-carious tooth structure loss, malformed/traumatized teeth, esthetic improvements, and replacing previous restorations. Caries is described as an infectious disease causing tooth structure demineralization. The purposes of operative dentistry are then given as diagnosis, prevention, interception, and maintenance of restored teeth.
Alveolar bone is the bone that forms the sockets for teeth and provides attachment for the periodontal ligament fibers. It has two parts - the alveolar bone proper which surrounds the root and the supporting alveolar bone which provides structural support. The alveolar bone proper consists of bundle bone, the cribriform plate containing Volkmann's canals, and lamellated bone. Osteoblasts form new bone on the surface while osteoclasts resorb bone, allowing for remodeling around teeth. The morphology and structure of alveolar bone is dependent on the number, size, shape and position of teeth.
Kennedy’s Classification in Cast Partial DentureAamir Godil
This document discusses Kennedy's classification system for partially edentulous arches and Applegate's rules for applying the Kennedy classification. It provides details on Kennedy's four basic classes for partial edentulism and Applegate's eight rules to govern the application of Kennedy's classification. Examples are given to demonstrate how to use Kennedy's classification and Applegate's rules to classify different clinical scenarios of partial edentulism.
This document discusses genetic factors that influence tooth development abnormalities. It begins by describing the normal development of primary and permanent dentition, regulated by signaling centers. Tooth agenesis and supernumerary tooth formation can result from mutations affecting genes in the Wnt, BMP, Shh, and FGF signaling pathways. Specific syndromes associated with tooth number anomalies like ectodermal dysplasia and cleidocranial dysplasia are also discussed. The document concludes by covering variations in tooth size and shape, including double teeth formed by fusion or gemination, taurodontism, and other dental anomalies.
Clinical consideration in tooth development, eruption and sheddingShashibhal Maurya
This document discusses various clinical considerations related to tooth development, eruption, and shedding. It begins with an introduction on tooth composition and classifications of developmental defects. It then examines specific defects that can occur during different stages of tooth development, such as anodontia, supernumerary teeth, gemination and fusion during the initiation stage. Enamel hypoplasia, dens invaginatus, taurodontism and amelogenesis imperfecta are among the defects discussed during the apposition stage. Syndromes associated with certain defects and systemic diseases that can cause tooth abnormalities are also reviewed.
This document provides details on the structure and composition of enamel. It notes that enamel is the hardest tissue in the body, covering the anatomical crown. It is made up primarily of hydroxyapatite crystals arranged in enamel prisms/rods from the dentin-enamel junction to the surface. The direction of the prisms changes in a sinusoidal pattern. Between the prisms is interprismatic enamel. Near the surface is aprismatic enamel which is more highly mineralized. Throughout life, the crown is covered by an organic layer or integument.
BE UPDATE TO IT,, AS IT IS 3 years back from 2017
Kindly mail me if you feel, needy of this presentation
you can find my mail id @ slide share,,, if not mail me @
sukesh3567@gmail.com.
Good luck
This document discusses genetics in tooth development. It begins with an introduction to the stages of tooth development from initiation to root formation. It describes the molecular control of tooth development including key genes such as Msx1, Pax9, Lef1, and Dlx genes. Tooth morphogenesis is controlled by the enamel knot through genes such as Bmp4. The roles of genes in enamel formation including AMELX, ENAM, KLK4 and MMP20 are discussed. Genetics of dentin formation including the role of the DSPP gene in dentinogenesis imperfecta are also summarized. The document provides an overview of the molecular genetics underlying tooth development and malformations.
THEORIES OF ERUPTION
ERUPTION SEQUENCE
PHYSIOLOGY OF TOOTH ERUPTION
CELLULAR BASIS
MOLECULAR BASIS
PRODUCTION OF OSTEOCLAST
ANOMOLIES OF TOOTH ERUPTION
This document discusses procedures for boxing master impressions and making master casts. It describes two methods for boxing maxillary impressions using either pumice and plaster or wax rods and strips. For mandibular impressions, a layer of adhesive or wax is applied to the impression border before adding a wax land and boxing wax enclosure. Master casts are poured in stone, trimmed with a 4-6mm peripheral roll and notches added for remounting. Landmarks like the incisive papilla and retromolar pad midpoint are marked on casts.
This document provides information on cementum, including its definition, physical characteristics, chemical composition, formation (cementogenesis), classification, functions, anomalies, and clinical considerations. Cementum is the mineralized tissue covering tooth roots. It is softer than dentin and lacks enamel's luster. Cementum formation involves acellular and cellular stages. Cementum attaches the periodontal ligament fibers to the tooth root and allows for tooth repair. Abnormalities include hypercementosis, ankylosis, and cementomas. Cementum is an important part of the periodontium that aids in tooth attachment and repair.
The document discusses the use of spacer wax in dental impressions. It describes the objectives of using spacer wax as providing relief to tissue and controlling the thickness of impression material. Spacer wax thickness can vary according to tissue attachment and load bearing capacity. The document also discusses different spacer wax designs, classifications, and guidelines for using spacer wax and tissue stops in selective pressure impression techniques.
Cementum is the mineralized tissue covering tooth roots. It consists of inorganic minerals like hydroxyapatite and organic materials like collagen. Cementum forms through cementogenesis, led by cementoblasts. There are two stages of cementogenesis - matrix formation where cementoblasts lay down an unmineralized matrix, and mineralization where crystals are deposited. Cementum can be classified as acellular or cellular based on the presence of cementocytes, and primary or secondary based on formation time. Cementum functions to attach teeth to bone and allows for adaptation.
The dental pulp contains zones including the odontoblastic zone, cell-free zone, and cell-rich zone. Principal cells include odontoblasts that synthesize dentin, fibroblasts that form the pulp matrix, and immune cells. Blood vessels enter the pulp and branches form capillaries. Nerves form the Raschkow plexus near the odontoblasts. The pulp provides nutrients and sensation to the tooth.
This document provides an overview of the anatomy, histology, development and clinical implications of alveolar bone. It describes the components and cellular makeup of bone, including osteoblasts, osteocytes and osteoclasts. It explains that the alveolar process develops with tooth eruption and is resorbed after tooth loss. Factors that regulate bone formation and resorption are discussed. The document also outlines how alveolar bone is affected by tooth loss, orthodontic forces and non-functioning teeth.
The document discusses the alveolar bone, including its definition, components, development, structure, clinical applications, and appearance on x-rays. It notes that the alveolar bone contains the tooth sockets and supports the teeth. The alveolar bone proper surrounds the tooth root and is perforated by Volkmann's canals. The supporting alveolar bone consists of cortical plates and spongy bone between the plates and alveolar bone proper. The alveolar bone undergoes remodeling and modeling during tooth movement and in response to functional forces.
ANATOMICAL LANDMARKS OF EDENTULOUS MAXILLAAamir Godil
This document discusses the anatomical landmarks of the maxilla that are important for complete denture construction. It defines stress bearing areas, relief areas, and limiting areas. Stress bearing areas include the postero-lateral slopes of the hard palate, residual alveolar ridge, rugae, and maxillary tuberosity. Relief areas are the incisive papilla, mid-palatine raphae, zygomatic process, sharp spiny spicules, torus palatinus, and cuspid eminence. Limiting areas are the labial frenum, labial vestibule, buccal frenum, buccal vestibule, anterior and posterior vibrating lines,
Cementum is the mineralized tissue covering dental roots. It begins at the cementoenamel junction and continues to the root apex. Cementum provides attachment for collagen fibers (Sharpey's fibers) that bind the tooth to surrounding structures. Cementum develops in two stages: the prefunctional stage involving matrix formation and mineralization, and the functional stage where cementum deposition continues throughout life in response to tooth movement and wear. Cementum comes in various forms classified by development, cellularity, and fiber origin and includes acellular, cellular, intrinsic and extrinsic fiber cementum.
The pulp is a soft connective tissue located within the tooth. It has several unique features, including being surrounded by rigid dentin walls and susceptible to changes in pressure. The pulp contains odontoblasts, fibroblasts, undifferentiated cells, and defense cells. It is highly vascularized and innervated. During development, dental papilla forms the pulp through proliferation and differentiation of cells. The pulp cavity is divided into coronal and radicular regions. Nerves and blood vessels enter through the apical foramen, supplying the pulp.
Cementum is the calcified tissue that forms the outer layer of the tooth root. There are two main types of cementum: acellular and cellular. Acellular cementum covers the cervical third of the root and lacks cells. Cellular cementum forms after the tooth reaches the occlusal plane and contains cementocytes within lacunae. Cementum is composed primarily of collagen fibers and undergoes continuous deposition throughout life, increasing thickness especially in the apical region to compensate for tooth eruption and attrition.
This document provides an introduction to operative dentistry. It defines operative dentistry as dealing with the functional and esthetic restoration of teeth. The main indications for operative procedures are then outlined, including dental caries, non-carious tooth structure loss, malformed/traumatized teeth, esthetic improvements, and replacing previous restorations. Caries is described as an infectious disease causing tooth structure demineralization. The purposes of operative dentistry are then given as diagnosis, prevention, interception, and maintenance of restored teeth.
Alveolar bone is the bone that forms the sockets for teeth and provides attachment for the periodontal ligament fibers. It has two parts - the alveolar bone proper which surrounds the root and the supporting alveolar bone which provides structural support. The alveolar bone proper consists of bundle bone, the cribriform plate containing Volkmann's canals, and lamellated bone. Osteoblasts form new bone on the surface while osteoclasts resorb bone, allowing for remodeling around teeth. The morphology and structure of alveolar bone is dependent on the number, size, shape and position of teeth.
Kennedy’s Classification in Cast Partial DentureAamir Godil
This document discusses Kennedy's classification system for partially edentulous arches and Applegate's rules for applying the Kennedy classification. It provides details on Kennedy's four basic classes for partial edentulism and Applegate's eight rules to govern the application of Kennedy's classification. Examples are given to demonstrate how to use Kennedy's classification and Applegate's rules to classify different clinical scenarios of partial edentulism.
This document discusses genetic factors that influence tooth development abnormalities. It begins by describing the normal development of primary and permanent dentition, regulated by signaling centers. Tooth agenesis and supernumerary tooth formation can result from mutations affecting genes in the Wnt, BMP, Shh, and FGF signaling pathways. Specific syndromes associated with tooth number anomalies like ectodermal dysplasia and cleidocranial dysplasia are also discussed. The document concludes by covering variations in tooth size and shape, including double teeth formed by fusion or gemination, taurodontism, and other dental anomalies.
Clinical consideration in tooth development, eruption and sheddingShashibhal Maurya
This document discusses various clinical considerations related to tooth development, eruption, and shedding. It begins with an introduction on tooth composition and classifications of developmental defects. It then examines specific defects that can occur during different stages of tooth development, such as anodontia, supernumerary teeth, gemination and fusion during the initiation stage. Enamel hypoplasia, dens invaginatus, taurodontism and amelogenesis imperfecta are among the defects discussed during the apposition stage. Syndromes associated with certain defects and systemic diseases that can cause tooth abnormalities are also reviewed.
(dental basic seminar)Development of tooth with basic embryology (public he...Dr Sharanprakash Shetgar
This document provides an overview of tooth development from an embryological and histological perspective. It discusses the initiation of tooth development from the oral ectoderm and ectomesenchyme, followed by the formation of the primary epithelial band and dental lamina. The key stages of tooth development are described, including the bud, cap and bell stages. Transitory structures like the enamel knot and cord that govern morphogenesis are also covered. The roles of signaling molecules and genes in determining tooth shape and position are summarized. Root development through the proliferation of Hertwig's epithelial root sheath is explained. The document concludes with emphasizing the importance of understanding tooth development mechanisms for dental diagnosis and prevention.
Embryology Dental and associated syndromesebinroshan07
This document summarizes key aspects of tooth development, structure, and genetic conditions. It discusses the embryology and signaling pathways involved in tooth formation such as SHH, BMP, WNT, and FGF. Mutations in these pathways can result in dental anomalies like tooth agenesis, fusion, or altered morphology. The structure and differences between primary and secondary dentition are outlined. Genetic conditions associated with changes in signaling include FOP (ACVR1), SSPS and OODD (WNT10A), and taurodontism. The chronology and factors influencing tooth eruption are also summarized.
Genetics in Tooth Development
Introduction
The Molecular Program of Tooth Development
Primary Epithelial Band
Dental Lamina
Vestibular Lamina
Initiation of the Tooth
Genes expressed during tooth development
Developmental signals controlling the position and the number of tooth germs along the oral surface
Homeobox code model
Instructive Signals for Patterning
Tooth Type Determination
Regionalization of Oral and Dental Ectoderm
Bud Stage
Bud-to-Cap Transition
Signaling centres
Applied aspects
This document provides an overview of odontogenesis, the process of tooth development. It discusses how teeth develop through the interaction of oral epithelial cells and underlying mesenchymal cells. The key stages of tooth development include:
1) Formation of the primary epithelial band and dental lamina, which gives rise to the tooth bud.
2) Progression through bud, cap, and bell stages as the tooth germ develops through interactions between the enamel organ and dental papilla.
3) Maturation stages involving dentinogenesis, amelogenesis, and root formation that sculpt the tooth shape and structure. A variety of genes regulate this complex process.
The document summarizes the development of teeth from the formation of the dental lamina to the bell stages of tooth development. It discusses how the dental lamina divides into the dental lamina and vestibular lamina, leading to the formation of the enamel organ and dental papilla/dental sac. It describes the three morphological stages of tooth development - bud stage, cap stage, and bell stage - and the histological changes that occur during each stage, including the differentiation of ameloblasts and odontoblasts.
1. The document describes the stages of tooth development from the dental lamina stage through the late bell stage. It discusses the formation and roles of structures like the enamel organ, dental papilla, and dental sac.
2. Key stages include histodifferentiation, morphodifferentiation, and apposition. During these stages, structures like ameloblasts and odontoblasts differentiate and deposit enamel and dentin matrices.
3. The enamel organ is composed of the outer enamel epithelium, stellate reticulum, stratum intermedium, and inner enamel epithelium. These structures play roles in organizing tooth shape, transporting nutrients, and producing enamel.
Amelogenesis imperfecta, hypoplastic type - Dr Sanjana RavindraDr. Sanjana Ravindra
(1) The document discusses amelogenesis imperfecta (AI), which refers to hereditary defects in enamel formation. It describes several classifications of AI based on clinical, radiographic, and histological findings. (2) The main types are hypoplastic (reduced enamel), hypocalcified (soft enamel), and hypomaturation (improperly formed enamel). Clinical features, inheritance patterns, and prevalence are provided for each type. (3) The case report describes a 26-year-old female patient diagnosed with hypoplastic AI based on yellow-brown tooth discoloration and decreased vertical dimension. She was treated with periodontal therapy and full-mouth fixed bridges.
The document discusses the stages of tooth development from the dental lamina stage through the bell stage. It begins with the proliferation of the primary epithelial band to form the dental lamina and vestibular lamina. Tooth buds then develop from the dental lamina through the bud stage, characterized by a small swelling, through the cap stage as the enamel organ takes on a cap shape. In the bell stage, the enamel organ enlarges and deepens to resemble a bell, and the inner enamel epithelium, stratum intermedium, stellate reticulum and outer enamel epithelium are distinguished. Transient structures like enamel knots are also discussed.
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
Stem cells found in dental tissues such as dental pulp, dental pulp of deciduous teeth, apical papilla, and dental follicle can differentiate into odontoblast cells and have potential applications in dental tissue regeneration and repair. There are several types of dental stem cells that can potentially be used to regenerate dental tissues and whole teeth. Delivery of growth factors has shown potential to induce homing of endogenous stem cells to regenerate dental pulp-like tissue in root canals of extracted human teeth implanted in mice without cell transplantation. Further research is still needed but dental stem cells show promise for applications in dental tissue engineering and whole tooth regeneration.
This document discusses the development of teeth from pre-natal to mixed dentition stages. It begins with the formation of dental lamina and enamel organs that give rise to deciduous teeth. The stages of tooth development from bud to bell stage are described. It then discusses the sequence of eruption of primary teeth and the characteristics of primary dentition including spacing, overjet, overbite and molar relationships. The mixed dentition period is divided into transitional phases with a focus on early and late shift occurring due to eruption of permanent molars and loss of deciduous teeth. Concepts such as leeway space and secondary spacing are also introduced.
Esthetic Management of Congenitally Missing Lateral Incisors With Single Toot...Abu-Hussein Muhamad
Congenitally missing teeth are frequently presented to the dentist. Interdisciplinary approach may be needed for the proper treatment plan. Several treatment options exist for the replacement of congenitally missing lateral incisors.This case report addresses the fundamental considerations related to replacement of a congenitally missing lateral incisor by a team approach.
Esthetic Management of Congenitally Missing Lateral Incisors With Single Toot...Abu-Hussein Muhamad
Congenitally missing teeth are frequently presented to the dentist. Interdisciplinary approach may be needed for the proper treatment plan. Several treatment options exist for the replacement of congenitally missing lateral incisors.This case report addresses the fundamental considerations related to replacement of a congenitally missing lateral incisor by a team approach.
Tooth Development (Odntogenesis_chapter 5) part 2 (17-03-2020 to 18-03-2020)....SafuraIjaz1
This document summarizes a lecture on tooth development (odontogenesis) delivered by Dr. Sadia Awais on March 17-18, 2020. It discusses two models that attempt to explain how tooth shape is determined: 1) The field model proposes that distinct but graded fields in the ectomesenchyme control the regional differentiation of dental mesenchyme and expression of patterning genes for each tooth family. 2) The clone model describes odontogenesis in terms of dental cell clones, with each clone responsible for developing a specific type of tooth (incisors, canines, or molars). It also lists several recommended books on oral histology, embryology, and development.
This case report describes a 9-year-old boy who presented with dental abnormalities characteristic of otodental syndrome. Key findings included large bulbous crowns in both primary and permanent canine and molar teeth. Radiographs showed the abnormal molars appeared to be fused tooth buds with duplicated pulp chambers. The patient was referred for hearing evaluation, though prior testing by parents found normal hearing. Otodental syndrome is characterized by dental anomalies and sensorineural hearing loss inherited in an autosomal dominant pattern with variable expression.
The document summarizes the development and growth of teeth from early formation in the embryo through the bell stage. It describes how the primary epithelial band forms and divides into the dental lamina and vestibular lamina. The dental lamina then goes through the bud, cap, and bell stages as it develops into the tooth germ and interacts with the underlying dental papilla and dental sac tissues to form the tooth structures. Key cellular and molecular signals that control tooth positioning and patterning are also discussed.
This document discusses young permanent teeth and their characteristics compared to mature teeth. It notes that young permanent teeth are those that have recently erupted and have not completed root development and closure of the apical foramen. The root development process can take 2-3 years after eruption. These young teeth are still developing and possess stem cells that can aid in continued root development. Factors like deep caries or trauma can lead to pulp necrosis in an immature tooth and result in an open apex. The document also discusses various classifications and stages of root development in young permanent teeth.
Similar to Clinical consideration in odontogenesis (20)
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
Clinical consideration in odontogenesis
1. Clinical Consideration in Tooth Development
PRESENTED BY : Dr. SHASHI BHAL MAURYA
MDS FIRST YEAR
ORAL AND MAXILLOFACIAL
PATHOLOGY AND MICROBIOLOGY
2. INTRODUCTION
• Teeth are specialized structural components of the craniofacial skeleton and are comprised of : enamel, dentin, and
cementum.
• Developmental defects occur in each of these mineralized tissues, either alone (isolated), or in a combination
(syndromic) with defects in other organs or tissues
3. Four signalling pathways, are repeatedly used throughout tooth development.
the bone morphogenetic proteins (Bmp),
fibroblast growth factors (Fgf),
sonic hedgehog (Shh),
wingless-related (Wnt) pathways
Inactivation of any of these resulted in early tooth developmental arrest in mice.
4. E 11.5 – thickening of oral epithelium
Expression of key signaling molecules
Bmp, Fgf, Wnt, Shh
Blocking each of these molecules results in tooth
arrest in dental lamina or bud stage
Bmp and Fgf signaling is required for activation
of expression of the Msx1 and Pax9
7. Kazhila C. Chinsembu ,Teeth are bones: Signature genes and molecules that underwrite odontogenesis
Journal of Medical Genetics and Genomics Vol. 4(2),March 2012
Wnt signaling is required early in tooth germ formation and interference
with signaling via addition of an antagonist results in retarded
development and formation of smaller teeth; mutation of β-catenin
causes formation of large, misshapen teeth buds and ectopic teeth.
8. E 11.5 – thickening of oral epithelium
Epithelium proliferates and invaginates into
the neural crest cell derived mesenchyme
and forms BUD
E 13.5 – BUD clearly forms and surrounded
by the condensing mesenchyme
Prior to the transition of bud to cap primary enamel
knot forms at the tip of the tooth bud.
And exihibits restricted expression of Bmp, Fgf, Wnt
9. ENAMEL KNOT
Bmp4 signaling from condensing mesenchyme and p21 from dental epithelium– induction of enamel
knot.
Plays central role in patterning of tooth crown by regulating growth and folding of the epithelium.
Addition of Bmp4 in oral epithelium
Upregulation of enamel knot marker such as p21
Overexpression of P21 –enlarged enamel knot and cuspal defects.
Like Dense in Dente, Dense Evaginatus, Talons cusp
11. E 14.5 - high proliferation outside the enamel knot
and low proliferation within the knot
Forming cap shape structure
If the shape of enamel knot is too small with mutation
of Eda or Edaradd (Eda expression is regulated by Wnt)
Hypohidrotic Ectodermal Dysplasia
Characterized by presence of molars with reduced
cusps and peg like teeth.
If Wnt signaling blocked in early bell stage when the secondary enamel knot is forming
--- again expression of Eda will reduced and molar forms with flattened cusps
12. Reducing tooth number
• It can be due to—
FUSION-fusion of existing tooth germ to form single compound tooth.
Fusion observed in-
SMMCI (single median maxillary central incisor syndrome)
Caused by failure in growth in midline, stimulated by a defect in SHH
signalling pathway (Nanni et al 2001)
13. Increase in tooth number
In the wild-type mouse mandible,
• one incisor forms from each incisor placode,
• three molars (M1, M2 and M3)forming from the molar placode.
1. One way increase number of tooth is to increase the number of placode.
(Ectopic application of Shh has been shown to lead to formation of ectopic tooth germs).
2. SPLITTING OF TOOTH GERM (GEMINATION): Rabbit molars were halved two miniature molars formed
(Glasstone 1952)
3. Multiple teeth have been shown to arise from the molar field in mice where β-catenin has been overexpressed (Jarvinen et al.
2006; Liu et al. 2008).
a) In mice - a) molar region was explanted in to kidney capsule three molars forms.
b) Molar region explanted into β-catenin mouse 40 teeth forms (Jarvinen et al.2006).
The initial tooth buds form normally, but the dental epithelium then starts to undergo further budding and
invaginations, leading to the formation of additional enamel knots and additional teeth and leads to the formation
of ODONTOMA.
4. Similar overproduction has been described in Epfn mutant mouse (Nakamura et al. 2008).
5. In human patients with a mutation in APC (is a Wnt modifier) supernumerary teeth and odontomas are observed (Fader
et al. 1962; Wolf et al. 1986; Wang et al. 1998)
14. Changing the complexity
Complexity of tooth- Altered by addition or removal of tooth.
Etiology -
1) Diet- diet dependent changes of dental pattern seen in both carnivores and rodents (Evans et al
2007)
2) Formation of additional enamel knot- overstimulation of Eda signaling pathway
3) NUMBER of cusp depends on both cusp size and tooth size.
• Larger tooth –more space to develop additional cusp
• If cusp is smaller – more cusp can be be fitted in (Cai et al 2007)
• Eg. Small molar (artificially created ) by recombining a small number of
mesenchymal cells with tooth epithelium number of cusp generated
was reduced(Hu et al 2006)
15. Mineralization:epithelial mesenchymal interaction
After the disappearance of the secondary enamel knot signalling centres, cells
of the tooth organ terminally differentiates-
•Inner enamel epithelium cells – Ameloblastoma
•Dental pulp mesenchyme- Odontoblast
Tgfb1, Fgfs, and Bmp2
Induce polarization of Odontoblast
(Begue-et al 1994)
16. The later stages of tooth development are characterized by the formation of the mineralized tissue:
dentin,cementum and enamel. Dentin and cementum have significant similarities with bone.
(Linde & Goldberg, 1993),
ENAMEL:
Inherited enamel defect known as Amelogenesis imperfecta.
Ameloblast secretes two major class of proteins-
Nonglycosylated –amelogennin – 90%of enamel matrix
Glycosylated – Tuftelin
• Ameloblastin
• Enamelin
Enamelin (ENAM) – main candidate responsible for autosomal inherited form of Amelogenesis
Imperfecta.
Amelogenin (AMLEX) mutation leads to X-linked Amelogenesis Imperfecta.
Also occurs due to mutation in Enamelysin and Kallikrein (KLK4).
17. DENTIN
Dentinal defects are classified into
dentin dysplasia type 1 and type 2
dentinogenesis imperfecta type 1,
type 2 and type 3
Dentinogenesis imperfecta universally designated as Osteogenesis imperfecta
with Dentinogenesis imperfecta.
Occurs due to mutation in type1 collagen.
Dentin dysplasia type 1 and type 2
Dentinogenesis imperfecta
Mutation in DSPP, COL1A1 AND
COL1A2
19. Expression of Bone Morphogenetic Proteins and Msx
Genes during Root Formation
Journal of Dental Research, Mar2003, Vol. 82 Issue 3, p172-176, 5p, 3 Color Photographs, 1 Chart
Color Photograph; found on p174
20. trauma to the calcified portion of the tooth germ which alters the
angulation of the tooth during root formation leads to .Dilaceration
.(NEVILLE)
21. The formation of ectopic enamel requires the presence of differentiated ameloblasts apical to the CEJ.
In humans, Hertwig's epithelial root sheath (HERS) or its residues, the epithelial rests of Malassez have
been implicated as the likely sources of ectopic ameloblasts.
Shivani sharma et al Enamel pearl on an unusual location associated with localized periodontal disease: A clinical report, J
Indian Soc Periodontol. 2013 Nov-Dec; 17(6): 796–800
If cells of the epithelial root sheath remain adherent to the dentin surface, they may differentiate into
fully functioning ameloblasts and produce enamel. Such droplets of enamel called Enamel pearls,
Mass of ectopic enamel located in
the furcation area of a molar tooth.
22. Genetic defects occurring late in tooth development
DLX3 mutation causes the deformation in multirooted tooth known as TAURODONTISM
(Bull like shape).
HYPOPHOSPHATASIA is a bone disorder caused by mutation in ALPL (alkaline
phosphatase).
Histological examination of pt with hypophophatasia
Shows lack of both cellular and acellular cementum formation.
23. References…
NEVILLE, ALLEN, BOUQUOT Oral and Maxillofacial Pathology third edition
Shafer’s text book of oral and maxillofacial pathology seventh edition
Orban’s oral histology and embryology 13th edition.
Aswathy Raj,Deepa.M.S, Ahmed Hasan Farooqi GENETICS AND TOOTH ANOMALIES - AN
UPDATEOral & Maxillofacial Pathology Journal Vol. 4 No. 1 Jan - June 2013
Hattab FN, Yassin OM, Al-Nimri KS. Talon cusp in the permanent dentition associated with
other dental anomalies: Review of literature and reports of seven cases. J Dent Child
1996;63:368-76.
Danker E, Harari D, Rotstein I. Dens evaginatus of anterior teeth. Literature review and
radiographic survey of 15,000 teeth. Oral Surg Oral Med Oral Pathol Oral Radiol Endod
1996;81:472-76
Thaleia Kouskoura1 Natassa Fragou1 Maria Alexiou1 Nessy John2 Lukas Sommer2,The genetic
basis of craniofacial and dental abnormalities, Schweiz Monatsschr Zahnmed Vol. 121 7/8/2011
24. Johannes G Dauwerse1, Mutations in genes encoding subunits of RNA polymerases I and III
cause Treacher Collins syndrome, NATURE GENETICS, VOLUME 43 | NUMBER 1 |
JANUARY 2011 .
Current knowledge of tooth development: patterning and mineralization of the murine
dentition Javier Catón and Abigail S. Tucker Department of Craniofacial Development and
Orthodontics, King’s College London, Floor 27, Guy’s Tower, Guy’s Hospital,London, UKJ.
Anat.(2009)214 pp502–515.
Teeth are bones: Signature genes and molecules that underwrite odontogenesis Kazhila C.
Chinsembu Journal of Medical Genetics and Genomics Vol. 4(2), pp. 13 - 24, March 2012
Jan C-C. Hu, James P.,Developmental biology and genetics of dental malformations Orthod
Craniofacial Res 10, 2007; 45–52
Here we will focus on little about the changes in the tooth germ that lead to the range of congenital tooth abnormalities and the disturbance of the epithelial-mesenchymal interactions.
Tooth passes through the various stages of development…..starting with initiation to end of the life cycle….disturbances occurring in any of these stages will lead to formation of developmental defects
Mesenchyme is a host ffor signaling molecules such as Bmp4, Msx1, Pax9
Induction of enamel knot is combination of the signal from epithelium and mesenchyme.
APC_adenomatous polyposis coli)----is a Wnt modifier that organizes the complex that degrades β-catenin.
Localization of Bmp2 (A,B), Bmp3 (C,D), Bmp4 (E,F), and Bmp7 (G,H) in the molars of a 14-day-old mouse. Panels B, D, F, and H are high-magnification views of the distal root of the 1st molar as shown in panels A, C, E, and F, respectively. Small arrowhead, large arrowhead, and arrow indicate expression in odontoblasts, cementoblasts, and osteoblasts, respectively. od, odontoblasts; ce, cementoblasts; ob, osteoblasts; am, ameloblasts, ers, epithelial root sheath
Dilaceration refers to an abnormal angulation or a sharp bend or curve anywhere along the root portion of a tooth.
Root angulation of a mandibular cuspid. Development has been altered by the presence of an adjacent compound odontoma