The document discusses the butterfly arch, a device used in orthodontics to control movement of upper molars in three dimensions. It operates based on five biomechanical principles: using tensile strength, tongue function, creating reactive forces, three-dimensional interactions, and using short segments. The arch provides anchorage, corrects rotations, and allows for movements like intrusion. It has advantages over other anchorage devices and indications include maximum anchorage cases. Modifications allow for maintaining transverse width or treating impacted teeth.
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
Class iii malocclusion /certified fixed orthodontic courses by Indian denta...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Loops in orthodontics /certified fixed orthodontic courses by Indian dental ...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
This document discusses various orthodontic prescriptions and appliances, focusing on Andrew's Straight Wire Appliance (SWA). It describes Andrew's research establishing six keys to normal occlusion and the measurements he took of tooth positions. It explains how Andrew's SWA is a fully programmed appliance that guides teeth using unbent archwires by incorporating built-in tip, torque, and rotation into customized brackets for each tooth. The document also summarizes other prescriptions like Roth and their philosophies regarding overcorrection of tooth positions.
Dr. ABIRAJ K R discusses the evolution of archwires over the last century. Material science advancements have led to new archwire materials with improved properties beyond stainless steel and gold alloys. Key developments include nickel-titanium, beta titanium, and newer thermally-activated alloys that deliver non-linear force through stress-induced structural changes. Proper understanding of an archwire's material properties is important for effective force delivery in orthodontic treatment.
determinate vs indeterminate force systemKumar Adarsh
This document discusses force systems in orthodontics. It describes determinate and indeterminate force systems, with determinate systems providing better control of forces and moments. One-couple systems are created using a cantilever spring or auxiliary arch wire tied to a tooth at one end. Two-couple systems are created when an arch wire is tied into brackets on both ends. Common applications of one and two-couple systems include intrusion/extrusion arches and lingual arches. Segmented arch mechanics allow precise control but require more wire bending compared to continuous arch wires.
in Orthodontics, Torque is a vital ingredient in the achievement of optimal esthetics, function and health of teeth and surrounding tissues, as also in stability of the treatment results
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
Class iii malocclusion /certified fixed orthodontic courses by Indian denta...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Loops in orthodontics /certified fixed orthodontic courses by Indian dental ...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
This document discusses various orthodontic prescriptions and appliances, focusing on Andrew's Straight Wire Appliance (SWA). It describes Andrew's research establishing six keys to normal occlusion and the measurements he took of tooth positions. It explains how Andrew's SWA is a fully programmed appliance that guides teeth using unbent archwires by incorporating built-in tip, torque, and rotation into customized brackets for each tooth. The document also summarizes other prescriptions like Roth and their philosophies regarding overcorrection of tooth positions.
Dr. ABIRAJ K R discusses the evolution of archwires over the last century. Material science advancements have led to new archwire materials with improved properties beyond stainless steel and gold alloys. Key developments include nickel-titanium, beta titanium, and newer thermally-activated alloys that deliver non-linear force through stress-induced structural changes. Proper understanding of an archwire's material properties is important for effective force delivery in orthodontic treatment.
determinate vs indeterminate force systemKumar Adarsh
This document discusses force systems in orthodontics. It describes determinate and indeterminate force systems, with determinate systems providing better control of forces and moments. One-couple systems are created using a cantilever spring or auxiliary arch wire tied to a tooth at one end. Two-couple systems are created when an arch wire is tied into brackets on both ends. Common applications of one and two-couple systems include intrusion/extrusion arches and lingual arches. Segmented arch mechanics allow precise control but require more wire bending compared to continuous arch wires.
in Orthodontics, Torque is a vital ingredient in the achievement of optimal esthetics, function and health of teeth and surrounding tissues, as also in stability of the treatment results
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
This document discusses various types of springs and loops used in orthodontics. It describes design factors that influence properties like stiffness, elastic limit, and moment-to-force ratio. Specific loops discussed include T-loops, tear drop loops, and Opus loops. Key points covered are how wire size, alloy, loop height/design, and position can be altered to achieve different force systems for controlled tooth movement. Maintaining an optimal moment-to-force ratio throughout treatment is important for controlled tipping, translation and root movement.
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
This document discusses various techniques for intruding teeth in orthodontics. It begins by defining intrusion and describing how it differs from other tooth movements like tipping. Deep overbites can be corrected through intrusion of anterior teeth or other movements. The principles of intrusion mechanics include applying light continuous forces through the center of resistance and using devices that create statically determinate force systems. Various intrusion appliances are described, including utility arches, tipback springs, continuous and segmented intrusion arches. Key biomechanical concepts for intrusion like controlling reactive forces and avoiding extrusion are also summarized.
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
Indirect bonding involves placing orthodontic brackets onto dental models or casts in the lab, then transferring them to the patient's teeth using transfer trays. There are several methods for indirect bonding, including the Thomas method using double sealant technique, Knights method bonding brackets directly to casts, and Sondhi's method using Bioplast trays. Indirect bonding provides more accurate bracket placement compared to direct bonding but requires extra lab time and carries risks of adhesive flash or bracket loss during transfer.
Anterior open bite treatment in the permanent dentition part 2-Marwan Mouakeh
This document discusses various methods for correcting anterior open bite malocclusions through intrusion of posterior teeth, including with skeletal anchorage. Skeletal anchorage methods like mini-implants or mini-plates can be used to actively intrude maxillary and mandibular molars in growing and non-growing patients. Placement of mini-implants on the palate between the first and second molars is recommended to provide stability and effective intrusion. Clinical tips are provided on mechanics, force magnitude, and avoiding unwanted tooth tipping during molar intrusion treatment.
This document discusses various methods and appliances for distalizing maxillary molars, including removable and fixed options. Removable appliances discussed include extraoral traction using headgear as well as removable appliances with finger springs or sliding jigs. Fixed appliances discussed include intramaxillary devices like Wilson's 3D appliance as well as intermaxillary appliances like Herbst or Jasper Jumper. Factors like the presence of second molars, skeletal pattern, and growth prognosis must be considered when determining whether molar distalization is indicated.
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
This document discusses the diagnosis and treatment of deep overbites. It begins by defining developmental and acquired deep overbites, and classifying them as dentoalveolar or skeletal. For dentoalveolar deep bites, intrusion of incisors or extrusion of molars may be used to correct the overbite. For skeletal deep bites, functional appliances or extraoral forces can modify jaw growth. Treatment may involve intrusion, extrusion, altering the occlusal plane, or guiding eruption. Deep overbites can be addressed during growth or after using compensation mechanics. The document provides details on various techniques and considerations for deep overbite treatment.
The document discusses Ronald Roth's modifications to the Andrews Straight Wire Appliance philosophy and treatment approach. Roth started using the Andrews appliance in 1970 and later modified the bracket prescription based on his clinical experience. Some key differences between Andrews and Roth include Roth allowing more tipping of teeth initially and building overcorrection into the brackets to account for relapse. Roth also placed more emphasis on achieving a gnathological occlusion goal versus Andrews' focus on anatomical tooth positions. The document outlines Roth's bracket placement, prescription, and rationale for his modifications to the straight wire appliance.
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
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
1) Mandibular molar protraction is challenging due to the high density of mandibular bone and inadequate anterior dental anchorage. Temporary anchorage devices (TADs) provide skeletal anchorage to protract molars.
2) Various TAD techniques are described for molar protraction, including using a lingual elastic tied from the molar to the archwire to prevent crossbite, and a "push-pull" technique placing a TAD in the edentulous space.
3) Molar protraction through atrophic alveolar ridges carries risks of periodontal complications, so techniques are described to minimize risks and protract molars at their center of resistance.
The document discusses orthodontic bracket prescriptions, including:
1) Early edgewise brackets required wire bends to control tooth movement, while contemporary brackets have built-in prescriptions for in-out, tip, and torque adjustments.
2) Lawrence Andrews introduced the pre-adjusted edgewise appliance with customized brackets programmed for specific tooth control without wire bends.
3) Later prescriptions like Roth and MBT incorporated changes like more torque in upper incisors to compensate for bracket limitations, while individual adaptations are often needed for specific cases.
Anchorage in beggs technique /certified fixed orthodontic courses by Indian d...Indian dental academy
Welcome to 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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
State of the art comprehensive training-Faculty of world wide repute &Very affordable.
Torque in pre adjusted e.w.a /certified fixed orthodontic courses by Indian...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,
Dental implants courses.for details pls visit
www.indiandentalacademy.com ,or call
0091-9248678078
Techniques for anchorage control in lingual orthodonticsParag Deshmukh
various techniques used in lingual orthodontics for anchorage control are described here.. and various cases of lingual orthodontics in which different techniques were used for anchorage control are discussed here..
The document discusses various space closure mechanics in orthodontic treatment. It describes sliding mechanics using elastic ties or nickel titanium springs to close extraction spaces, as well as loop mechanics using loops fabricated in archwires. The ideal force delivery system is economical, provides optimal controlled tooth movement with minimal operator manipulation or patient discomfort. Nickel titanium springs provide faster space closure than elastic ties and maintain force more consistently over time. Both continuous sliding mechanics and two-step retraction can effectively retract anterior teeth with similar levels of anchorage loss and root resorption.
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
This document discusses various types of springs and loops used in orthodontics. It describes design factors that influence properties like stiffness, elastic limit, and moment-to-force ratio. Specific loops discussed include T-loops, tear drop loops, and Opus loops. Key points covered are how wire size, alloy, loop height/design, and position can be altered to achieve different force systems for controlled tooth movement. Maintaining an optimal moment-to-force ratio throughout treatment is important for controlled tipping, translation and root movement.
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
This document discusses various techniques for intruding teeth in orthodontics. It begins by defining intrusion and describing how it differs from other tooth movements like tipping. Deep overbites can be corrected through intrusion of anterior teeth or other movements. The principles of intrusion mechanics include applying light continuous forces through the center of resistance and using devices that create statically determinate force systems. Various intrusion appliances are described, including utility arches, tipback springs, continuous and segmented intrusion arches. Key biomechanical concepts for intrusion like controlling reactive forces and avoiding extrusion are also summarized.
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
Indirect bonding involves placing orthodontic brackets onto dental models or casts in the lab, then transferring them to the patient's teeth using transfer trays. There are several methods for indirect bonding, including the Thomas method using double sealant technique, Knights method bonding brackets directly to casts, and Sondhi's method using Bioplast trays. Indirect bonding provides more accurate bracket placement compared to direct bonding but requires extra lab time and carries risks of adhesive flash or bracket loss during transfer.
Anterior open bite treatment in the permanent dentition part 2-Marwan Mouakeh
This document discusses various methods for correcting anterior open bite malocclusions through intrusion of posterior teeth, including with skeletal anchorage. Skeletal anchorage methods like mini-implants or mini-plates can be used to actively intrude maxillary and mandibular molars in growing and non-growing patients. Placement of mini-implants on the palate between the first and second molars is recommended to provide stability and effective intrusion. Clinical tips are provided on mechanics, force magnitude, and avoiding unwanted tooth tipping during molar intrusion treatment.
This document discusses various methods and appliances for distalizing maxillary molars, including removable and fixed options. Removable appliances discussed include extraoral traction using headgear as well as removable appliances with finger springs or sliding jigs. Fixed appliances discussed include intramaxillary devices like Wilson's 3D appliance as well as intermaxillary appliances like Herbst or Jasper Jumper. Factors like the presence of second molars, skeletal pattern, and growth prognosis must be considered when determining whether molar distalization is indicated.
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
This document discusses the diagnosis and treatment of deep overbites. It begins by defining developmental and acquired deep overbites, and classifying them as dentoalveolar or skeletal. For dentoalveolar deep bites, intrusion of incisors or extrusion of molars may be used to correct the overbite. For skeletal deep bites, functional appliances or extraoral forces can modify jaw growth. Treatment may involve intrusion, extrusion, altering the occlusal plane, or guiding eruption. Deep overbites can be addressed during growth or after using compensation mechanics. The document provides details on various techniques and considerations for deep overbite treatment.
The document discusses Ronald Roth's modifications to the Andrews Straight Wire Appliance philosophy and treatment approach. Roth started using the Andrews appliance in 1970 and later modified the bracket prescription based on his clinical experience. Some key differences between Andrews and Roth include Roth allowing more tipping of teeth initially and building overcorrection into the brackets to account for relapse. Roth also placed more emphasis on achieving a gnathological occlusion goal versus Andrews' focus on anatomical tooth positions. The document outlines Roth's bracket placement, prescription, and rationale for his modifications to the straight wire appliance.
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
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
1) Mandibular molar protraction is challenging due to the high density of mandibular bone and inadequate anterior dental anchorage. Temporary anchorage devices (TADs) provide skeletal anchorage to protract molars.
2) Various TAD techniques are described for molar protraction, including using a lingual elastic tied from the molar to the archwire to prevent crossbite, and a "push-pull" technique placing a TAD in the edentulous space.
3) Molar protraction through atrophic alveolar ridges carries risks of periodontal complications, so techniques are described to minimize risks and protract molars at their center of resistance.
The document discusses orthodontic bracket prescriptions, including:
1) Early edgewise brackets required wire bends to control tooth movement, while contemporary brackets have built-in prescriptions for in-out, tip, and torque adjustments.
2) Lawrence Andrews introduced the pre-adjusted edgewise appliance with customized brackets programmed for specific tooth control without wire bends.
3) Later prescriptions like Roth and MBT incorporated changes like more torque in upper incisors to compensate for bracket limitations, while individual adaptations are often needed for specific cases.
Anchorage in beggs technique /certified fixed orthodontic courses by Indian d...Indian dental academy
Welcome to 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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
State of the art comprehensive training-Faculty of world wide repute &Very affordable.
Torque in pre adjusted e.w.a /certified fixed orthodontic courses by Indian...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,
Dental implants courses.for details pls visit
www.indiandentalacademy.com ,or call
0091-9248678078
Techniques for anchorage control in lingual orthodonticsParag Deshmukh
various techniques used in lingual orthodontics for anchorage control are described here.. and various cases of lingual orthodontics in which different techniques were used for anchorage control are discussed here..
The document discusses various space closure mechanics in orthodontic treatment. It describes sliding mechanics using elastic ties or nickel titanium springs to close extraction spaces, as well as loop mechanics using loops fabricated in archwires. The ideal force delivery system is economical, provides optimal controlled tooth movement with minimal operator manipulation or patient discomfort. Nickel titanium springs provide faster space closure than elastic ties and maintain force more consistently over time. Both continuous sliding mechanics and two-step retraction can effectively retract anterior teeth with similar levels of anchorage loss and root resorption.
Biomechanics of extra alveolar mini-implantsAshok Kumar
1) Extra-alveolar mini-implants placed in the infrazygomatic crest and mandibular buccal shelf areas provide effective anchorage for orthodontic tooth movement and treatment of complex malocclusions.
2) These mini-implants allow en masse retraction of the entire maxillary or mandibular arch in a single step using statically determinate biomechanics.
3) Retraction forces generated rotate the dental arch, causing intrusion of posterior teeth and extrusion of anterior teeth, which can assist in treating open bites and sagittal discrepancies.
Lip bumper, quad helix, tongue crib,Tpa,Nance by Dr.Saurav Mishrasaurav mishra
This document discusses the lip bumper, quad helix, and tongue crib appliances. It provides details on the design, indications, and mechanisms of these appliances. The quad helix appliance is described as having anterior and posterior helical loops to provide a wide range of continuous, controlled force during maxillary expansion. Its fan-like sweeping action can buccally expand and distally rotate the maxillary molars. Indications for the quad helix include correcting crossbites through upper arch expansion and mild class II malocclusions requiring upper arch widening and molar rotation. Complications and clinical management are also briefly covered.
This document discusses several orthodontic appliances including the Nance appliance, transpalatal arch, quad helix, lip bumper, and tongue crib. It provides details on the design, indications, mechanisms of action, advantages and disadvantages of each appliance. The document is intended as an educational guide for orthodontic residents, as it is presented by several orthodontists and covers the key aspects of these common fixed functional appliances.
Canine retraction in pre adjusted edgewise technique /certified fixed orthodo...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Basic principles of removable partial denture design copyAbbasi Begum
The document discusses several key factors in designing removable partial dentures (RPDs) to minimize stress on abutment teeth, including:
1) Understanding biomechanics and the types of movements that occur in RPDs.
2) Factors like edentulous span length, ridge support, clasp design, and occlusal harmony influence the amount of stress transmitted.
3) Design considerations like indirect retainers, auxiliary rests, major/minor connectors, and extending the denture base help distribute forces and reduce stress.
Proper planning and following biomechanical principles leads to successful RPD designs.
Torquing in orthodontics /certified fixed orthodontic courses by Indian dent...Indian dental academy
Welcome to 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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
Anchorage preparation in pae /certified fixed orthodontic courses by Indian d...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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
biomechanics of space closure in orthodonticcs / fixed orthodontics coursesIndian 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.
Mc Cracken chapter 4: Biomechanics of Removable Partial Denture.Joel Koshy
This document discusses the biomechanics of removable partial dentures. It outlines how removable partial dentures are prone to movement under functional loads, which can exert stresses on supporting teeth and structures. The goal of biomechanics in design is to minimize these potentially destructive forces to within the physiological tolerance of tissues. Simple machines like levers are discussed, and how their forces should be avoided in design. Key considerations for minimizing damaging movements include obtaining maximum tissue support, minimizing cantilevers, and positioning retainers and guides to resist various movements. The use of implants can help restrict movements in removable partial dentures.
Intrusion PEREPERD BY DR.ABDULGHANI ALMOHAYA ,ALHADDAD.pptxAbdulghaniAlmohaya
The document discusses intrusion, which refers to the apical movement of a tooth's geometric center in relation to the occlusal plane or the tooth's long axis. Intrusion can be used to correct deep overbites by moving anterior teeth vertically downward. True intrusion is achieved by applying a single intrusive force through the tooth's center of resistance. Several appliances can provide intrusive forces, including utility arches, tip-back springs, and segmented arches. Proper biomechanics must be followed, such as applying light, constant forces and positioning the force vector through the tooth's center of resistance and parallel to its long axis.
Friction less mechanics in orthodontics /certified fixed orthodontic course...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
Orthodontic tooth movement during space closure can occur through two types of mechanics: segmental/sectional mechanics which do not involve friction, and sliding mechanics which do involve friction between the bracket and archwire. Friction plays a significant role in sliding mechanics. Several methods are used to apply force during space closure, including elastomeric modules, elastomeric chains, and closed coil springs made of materials like stainless steel and nickel titanium. These methods vary in terms of factors like force degradation over time and sensitivity to environmental factors like temperature. Maintaining an optimal force during retraction is important for controlled tooth movement.
Extrusion arches of Nanda by Dr Maher FoudaMaher Fouda
The document discusses the use of extrusion arches for correcting anterior open bites. It describes how extrusion arches work by inverting intrusion arch mechanics to apply an extrusive force on the anterior teeth. Extrusion arches can be used in non-compliant patients to correct open bites. Various modifications to extrusion arches are discussed, such as adding buccal segments or vertical elastics, to prevent unwanted tipping movements. Extrusion arches combined with vertical elastics are shown to successfully correct open bites while maintaining occlusion.
The document discusses the use of an extrusion arch to correct an anterior open bite. It describes how an extrusion arch creates a one-couple force system, applying an extrusive force to the anterior teeth and an intrusive force plus tip-forward moment to the posterior anchorage. It notes that seating elastics are needed to control the unwanted tipping, and presents a case report where miniscrew anchorage was used instead to prevent tipping while the arch closed an open bite over multiple months.
The document provides information about the MBT bracket system. Some key points:
- MBT was developed by Dr. Richard McLaughlin, Dr. John Bennett, and Dr. Hugo Trevisi to address limitations of previous pre-adjusted edgewise appliances.
- MBT utilizes light, continuous forces with sliding mechanics principles. Torque is incorporated fully into the bracket bases.
- Bracket tip and torque specifications are designed to achieve ideal tooth positions and occlusion. Canine torque values were modified from original straight wire appliance prescriptions.
- MBT treatment philosophy emphasizes accuracy of bracket placement, group tooth movement, anchorage control, and awareness of tooth size discrepancies.
This document summarizes Nance appliances, transpalatal arches, and quad helix appliances. It describes the design, indications, and disadvantages of each appliance. For transpalatal arches, it notes they are used to prevent mesial migration of upper first molars and can provide anchorage, arch width stabilization, and be used as a retainer. Quad helix appliances are used to expand arches and derotate molars through a fan-like sweeping action. Nance appliances maintain posterior tooth positions and can be modified to provide an anterior bite plane.
Similar to Butterfly arch a device for precise controlling of the upper (20)
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
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.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
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
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
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2. Biomechanics and force system
of butterfly arch: A device for three-
dimensional controlling of upper molars
Alireza Nikkerdar
Private Practitioner, Tehran, Iran
Presented by
Dr Sankha Nilay Das
PG 1st Year
4. INTRODUCTION
First introduced by Robert A. Goshgarian in
1972. After that, Burstone and Koenig in 1981
have considered many of the biomechanical
aspects of activating the transpalatal arch.
5. TPA
Transpalatal arch (TPA) or palatal bar (PB) is a
device that has been used for many years in
different clinical situations either with fixed or
removable types; the appliance is usually
made of a stiff stainless steel wire with an
omega loop in center
6.
7. Uses of the TPA
1) Correction of Molar Rotation:-
10. 2)Stabilization and Anchorage
Once the position of molars has been
corrected,the TPA serves as a stabilizing
appliance by connecting the two first
molars with the palatal wire. An
anchorage unit is formed that resists the
mesial movement of the molars.
Its quite useful when elastomeric
chain is used on a continuous arch wire.
20. The TPA resists the tendency of the
molars to rotate in a mesial direction
around the lingual roots.
however, this idea has not been confirmed by
new articles.
Zablocki et al. pointed out that the PB
neither preserves the anchorage nor the
vertical dimension during orthodontic
treatment.
21. Kojima and Fukui evaluated the
stress level in periodontal
ligament (PDL) in the presence
and absence of PB; they
observed no difference between
the control group and the group
with PB during space closure
stage.
22. Why???
The reason is quite simple.
The failure of upper lingual
appliances to preserve the
anchorage is because of the
inability to resist against
the forces that apply
perpendicular to its long
axis.
23. Anchorage loss
In a maximum anchorage situation,
anchorage loss happens, more or less due
to the creation of a reactive force as a
result of anterior teeth retraction during
space closure.
24. This appears in two distinct forms…
(1) in first order because of mesial-in rotation of
posterior teeth, especially first molars when the
reactive forces apply from buccal surface
related to the centers of resistance; therefore,
widest part of teeth encroaches the extraction
space
25. (2) In second order, as the consequence
of tip-forward moment that exerts on
posterior anchorage units, these teeth
encounter “dumping effect” that leads to
more anchorage loss.
26. Solution…
a rigid framework with high resistance against
distortion and is introduced here as an
appliance that could preserve the posterior
anchorage with simultaneous controlling of
vertical and transverse dimensions
30. Biomechanical principles
The biomechanics of butterfly arch are based
on five principles regarding its unique design:
1. The principle of using tensile strength.
2. The principle of using tongue function.
3. The principle of creating reactive forces.
4. The principle of three-dimensional (3D)
interactions.
5. The principle of using short segments.
31. 1)The principle of using tensile strength
when a mesially directed force exerts on
one end of a PB, the resultant of intrinsic
forces is equal to 0, meaning there is no
axial loading. Therefore, connecting left
and right sides of the dental arch in
molar area do nothing with anchorage
reinforcement at all.
32. In butterfly arch, when a force that tends to
displace the teeth of anchorage units applies,
tension rises in all cross sections of the
connecting oblique wire known as “bracing
unit”. This would create an additional
component to counteract mesially directed
force.
33. Force system of a butterfly arch when a mesially directed force (F)
applies on the left side of the picture dealing with resistance
forces (R) of posterior teeth and bracing element (red segment).
This would create an additional component to counteract
mesially directed force.
34. 2)Principle of using tongue function
A wide pentagonal area, which is called here as
“tongue trapping area” (often with acrylic
coverage), could trap and direct the tongue
pressure during functions (swallowing, speech,
and chewing). the wider part of tongue trapping
area is located behind the center of resistance,
and therefore, perpendicular tongue pressure
against palate creates a high level of force on that
area which tends to tip the crowns of upper first
and second molars distally
35. Tip-back moment created by tongue function on tongue
trapping area regarding center of resistance of the appliance.
36. 3)The principle of 3D interactions
• Interaction of vertical and horizontal dimensions
shows the effect of a force on an
object that is displaced by a drag
force (F) in a distinguished direction
(D) with a constant velocity if we
eliminate the role of friction.
D
37. A condition when a
perpendicular force (Fv)
applies on the moving
object. If we need to
maintain the original
velocity, we have to
increase the drag force to
the extent that overcomes
the additional vertically
directed force.
38. The same story is true for the
butterfly arch when the tongue
presses the tongue trapping area
against palate during function.
This vertical component of tongue
force could affect the
inappropriate reactive mesially
directed force of anterior
retraction and therefore could
enhance anchorage in
anteroposterior plane.
39. Interaction of transverse and
horizontal dimensions
The rigidity of butterfly arch is
considerably high. It is made of stiff
stainless steel wire, and soldered
joints create short segments that
increase total rigidity of the
framework of the appliance
markedly.
If this rigid apparatus encounters
anchorage loss, the diameters have
to be shortened inevitably and
“butterfly wing effect” occurs.
40. Butterfly wing effect.
This effect happens when a butterfly closes its wings and
results in diminution in width. The high rigidity of the arch
withstands this phenomenon because a huge force is needed
to distort the multiplication sign-like framework.
41. 4)The principle of creating reactive forces
Regarding causative factors of anchorage loss,
there are some components to neutralize
mesial-in rotation and mesial tipping of the
first- and second orders, respectively,
so establishing a mechanism for applying
reactive forces in the form of mesial-out and
tip-back moments is essential for anchorage
control.
42. # Mesial-out moment is created by 1-mm preactivation (0.5 mm
each side) with opening of omega loop before placing of the
appliance . This expands the inter-molar width slightly and usually
remains until removing the butterfly arch in finishing stage.
# The tip-back moment is created by tongue pressure against the
tongue trapping area.
43. 5)The principle of using short segments
The essence of accurate
application of butterfly arch is
high rigidity for either
preservation of transverse
dimension or stabilization of the
system and prevention of
distortion.
To preclude long lever arms and huge bending moments at soldering
areas due to tongue function during mastication, we must avoid long
segments as far as possible. Therefore, soldering points all over the
framework are made to increase the total rigidity of the appliance
effectively.
44. Clinical indications of butterfly arch
1. Maximum anchorage cases with/without vertical
discrepancy
2. Open bite correction
3. To treat children with vertical maxillary excess
instead of long-term headgear therapy
4. Full-cusp class II patients undergoing orthodontic
camouflage in which maximum anchorage is
required.
5. Full-cusp class II subdivision cases.
45. Modifications
A modification of butterfly
arch for excellent maintaining
of transverse dimension.
A modification of butterfly
arch in impacted teeth
condition.
46. Discussion
Some conventional appliances that are used for
anchorage reinforcement are as follows: headgear,
TPA, Nance appliance, intra-osseous plates, and
screws.
TPA and Nance appliance are good for tooth
movement and rotation control, but because of
biomechanical weaknesses, as mentioned earlier,
anchorage preservation is compromised.
47. Although butterfly arch possesses
numerous distinct advantages, however,
if anchorage value and PDL stress distribution
of the teeth of reactive unit are the same,
and if an equal activation of right and left
closing loops is performed, the result might be
a mesial movement of whole system as the
effect of a huge reactive force of anchorage
loss without any intervention of bracing units
of butterfly arch. This is usually rare.
48. Conclusion
Mechanical principles were described before, and
they are new and unique and could be used for
3D preservation of upper anchorage teeth
effectively. Expressions such as bracing systems
and units, tongue trapping area, and butterfly
wing effect are special mechanical characteristics
of butterfly arch, and all of them are involved in
3D controlling of posterior anchorage units. The
appliance has different shapes and configurations
in various clinical situations.
50. Three-Dimensional Control
on Lingually Rolled in Molars
using a 3D Lingual Arch
Sunil Sunny, Denny p Joseph, Neethu Mathew, Roshini Sara Rajan, Eldo
Kurian
Journal of Clinical and Diagnostic Research. 2017 Aug, Vol-11(8)
51. The fixed lingual arches that are used for
mandibular molar uprighting works in two
dimensions, whereas the 3D lingual arch
works in all the three dimensions. The 3D
lingual arch was fabricated from a
0.028”round S.S wire with parts consisting of
an adaptor, activator, friction lock and
extender. The friction lock was inserted into
the vertical stubs welded on the molar bands
of the lingually tipped molar. They provided
greater stability and anchorage to the molars.
53. A 12-year-old female patient: a) with end on molar
relation on right side; b) lingually tipped mandibular
first molars bilaterally; c,d) posterior scissor bite on
left side and deep bite.
54. Insertion of the 3D Lingual
arch immediately after the
extraction of the second
premolars.
Holding arch with anterior
bite plane in the upper
arch.
55. One month later: a) occlusal picture shows the
correction of lingually tipped molars; (b) left lateral
view showing the correction of scissor bite on left
side.
56. a) Lower arch was bonded along with the 3D lingual
arch; b) removed the 3D lingual arch after the
correction of molar uprighting.
57. Effects of transpalatal arch on molar
movement produced by mesial force:
A finite element simulation
Yukio Kojimaa and Hisao Fukuib
Nagoya, Japan
58. They concluded that TPA had no effect
on the initial movement. In the orthodontic
movement, the TPA had almost no effect,
preserving anchorage for mesial movement.
However, the TPA prevented rotational and
transverse movements of the anchor teeth.