Anchorage in orthodontics kishy /certified fixed orthodontic courses by Indian dental academy

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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

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Anchorage in orthodontics kishy /certified fixed orthodontic courses by Indian dental academy

  1. 1. ANCHORAGE IN ORTHODONTICS INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. NEWTON’S third law of motion : “ Every action has an equal and opposite reaction.” www.indiandentalacademy.com
  3. 3. DEFINITIONS : Moyers : “ Resistance to displacement.” Active elements and reactive elements. T.M. Graber : “The nature and degree of resistance to displacement offered by an anatomic unit when used for the purpose of effecting tooth movement.” www.indiandentalacademy.com
  4. 4. DEFINITIONS : Proffit : “Resistance to unwanted tooth movement.” “Resistance to reaction forces that is provided (usually) by other teeth, or (sometimes) by the palate, head or neck (via extraoral force), or implants in bone.” www.indiandentalacademy.com
  5. 5. DEFINITIONS : Nanda : “The amount of movement of posterior teeth (molars, premolars) to close the extraction space in order to achieve selected treatment goals.” www.indiandentalacademy.com
  6. 6. CLASSIFICATIONS: Moyers : According to the manner of force application: 1. Simple anchorage : Resistance to tipping. 2. Stationary anchorage : Resistance to bodily movement. www.indiandentalacademy.com
  7. 7. CLASSIFICATIONS: 3. Reciprocal anchorage : Two or more teeth moving in opposite directions and pitted against each other by the appliance. www.indiandentalacademy.com
  8. 8. CLASSIFICATIONS: Moyers : According to the jaws involved: 1. Intra maxillary : Anchorage established in the same jaw. www.indiandentalacademy.com
  9. 9. CLASSIFICATIONS: 2. Inter maxillary : Anchorage distributed to both jaws. Baker’s anchorage (1904) www.indiandentalacademy.com
  10. 10. CLASSIFICATIONS: Moyers : According to the site of anchorage: 1. Intra oral : Anchorage established within the mouth. www.indiandentalacademy.com
  11. 11. CLASSIFICATIONS: 2. Extra oral : Anchorage obtained outside the oral cavity. a.) Cervical : eg. neck straps b.) Occipital : eg. Head gears c.) Cranial : eg. High pull headgears d.) Facial : eg. Face masks www.indiandentalacademy.com
  12. 12. CLASSIFICATIONS: www.indiandentalacademy.com
  13. 13. CLASSIFICATIONS: 3. Muscular : Anchorage derived from action of muscles. eg. Vestibular shields. www.indiandentalacademy.com
  14. 14. CLASSIFICATIONS: Moyers : According to the number of anchorage units : 1. Single or primary anchorage: Anchorage involving only one tooth. 2. Compound anchorage: Anchorage involving two or more teeth. www.indiandentalacademy.com
  15. 15. CLASSIFICATIONS: 3. Reinforced anchorage: Addition of non dental anchorage sites. eg. Mucosa, muscle, head, etc. www.indiandentalacademy.com
  16. 16. CLASSIFICATIONS: Nanda : A anchorage : critical / severe 75 % or more of the extraction space is needed for anterior retraction. B anchorage : moderate Relatively symmetric space closure (50%) C anchorage : mild / non critical 75% or more of space closure by mesial movement of posterior teeth www.indiandentalacademy.com
  17. 17. CLASSIFICATIONS: www.indiandentalacademy.com
  18. 18. CLASSIFICATIONS: Burstone : Group A arches Group B arches Group C arches www.indiandentalacademy.com
  19. 19. CLASSIFICATIONS: www.indiandentalacademy.com
  20. 20. BIOLOGICAL ASPECTS OF ANCHORAGE : Factors affecting anchorage: Number of roots Shape, size and length of each root multirooted > single rooted longer rooted > shorter rooted triangular shaped root > conical or ovoid root larger surface area > smaller surface area www.indiandentalacademy.com
  21. 21. BIOLOGICAL ASPECTS OF ANCHORAGE : Factors affecting anchorage: Cortical anchorage: Cortical bone vs. medullary bone Muscular forces: Horizontal growers vs. vertical growers www.indiandentalacademy.com
  22. 22. BIOLOGICAL ASPECTS OF ANCHORAGE : Factors affecting anchorage: Forces of occlusion Age of the patient Individual tissue response www.indiandentalacademy.com
  23. 23. BIOLOGICAL ASPECTS OF ANCHORAGE : Pressure in the PDL= Force applied to a tooth Area of distribution in PDL Tooth movement increases as pressure increases upto a point, remains at same level over a broad range and then may gradually decline with extremely heavy pressure. www.indiandentalacademy.com
  24. 24. BIOLOGICAL ASPECTS OF ANCHORAGE : PRESSURE RESPONSE CURVE : www.indiandentalacademy.com
  25. 25. BIOLOGICAL ASPECTS OF ANCHORAGE : Anchorage situations : Reciprocal tooth movement : Equal force distribution over the PDL eg. Midline diastema, First premolar extraction site Anchorage value depends on the root surface area www.indiandentalacademy.com
  26. 26. BIOLOGICAL ASPECTS OF ANCHORAGE : Anchorage situations : Reinforced anchorage: Distribution of force over a larger surface area Light forces vs. heavy forces eg. Addition of extra teeth, Extra oral anchorage www.indiandentalacademy.com
  27. 27. BIOLOGICAL ASPECTS OF ANCHORAGE : Anchorage situations : Stationary anchorage: Bodily movement of anchor teeth vs. tipping of teeth to be moved www.indiandentalacademy.com
  28. 28. MECHANICAL ASPECTS OF ANCHORAGE : Tooth movement is brought about after overcoming the frictional resistance during sliding of wire in the bracket. Frictional force is proportional to the force with which the contacting surfaces are pressed together Affected by the nature of the surface Independent of the area of contact www.indiandentalacademy.com
  29. 29. MECHANICAL ASPECTS OF ANCHORAGE : Asperities : Peaks of surface irregularities. www.indiandentalacademy.com
  30. 30. ANCHORAGE LOSS: Anchor loss in all 3 planes of space : Sagittal plane: - Mesial movement of molars, - Proclination of anteriors www.indiandentalacademy.com
  31. 31. ANCHORAGE LOSS: Vertical plane: - Extrusion of molars, - Bite deepening due to anterior extrusion www.indiandentalacademy.com
  32. 32. ANCHORAGE LOSS: Transverse plane: - Buccal flaring due to over expanded arch form and unintentional lingual root torque, - Lingual dumping of molars, www.indiandentalacademy.com
  33. 33. ANCHORAGE IN REMOVABLE APPLIANCES: Early removable appliances: Completely tooth borne Partly cast, partly wrought wire Bimler appliance www.indiandentalacademy.com
  34. 34. ANCHORAGE IN REMOVABLE APPLIANCES: Early removable appliances: Crozat appliance www.indiandentalacademy.com
  35. 35. ANCHORAGE IN REMOVABLE APPLIANCES: CLASPED REMOVABLE APPLIANCES: - Active part, - Clasps, - Baseplate. Baseplate : - Point of attachment for the active components, - Distribution of the reactionary forces to the teeth and tissues. www.indiandentalacademy.com
  36. 36. ANCHORAGE IN REMOVABLE APPLIANCES: To ensure adequate anchorage from baseplates: - Extension as far as possible, also for stability, - Close fit to the tissues, - Contouring along the lingual gum margins, - Adequate bulk of acrylic. - Eg. Schwartz expansion plate www.indiandentalacademy.com
  37. 37. ANCHORAGE IN REMOVABLE APPLIANCES: Wire components: - Labial bow: Prevents proclination of incisors Stationary anchorage. Intermaxillary anchorage: - Elastics Headgears www.indiandentalacademy.com
  38. 38. ANCHORAGE IN REMOVABLE APPLIANCES: REMOVABLE FUNCTIONAL APPLIANCES: Tooth borne appliances: - Sved bite plane: stationary anchorage www.indiandentalacademy.com
  39. 39. ANCHORAGE IN REMOVABLE APPLIANCES: REMOVABLE FUNCTIONAL APPLIANCES: Tooth borne appliances: Activator, bionator, twin block www.indiandentalacademy.com
  40. 40. ANCHORAGE IN REMOVABLE APPLIANCES: REMOVABLE FUNCTIONAL APPLIANCES: Anchorage obtained by: - capping of incisal margins of lower incisors - proper fit of cusps of teeth into the acrylic - deciduous molars used as anchor teeth www.indiandentalacademy.com
  41. 41. ANCHORAGE IN REMOVABLE APPLIANCES: REMOVABLE FUNCTIONAL APPLIANCES: Tissue borne appliances: - Vestibular screen, Frankel’s function regulator Anchorage by acrylic extending into vestibule Headgears www.indiandentalacademy.com
  42. 42. ANCHORAGE IN REMOVABLE APPLIANCES: REMOVABLE FUNCTIONAL APPLIANCES: Tissue borne appliances: - Vestibular screen www.indiandentalacademy.com
  43. 43. ANCHORAGE IN FIXED APPIANCES: HISTORICAL PERSPECTIVE: ANGLE; E arch : - tipping tooth movements - first to utilise stationary anchorage of 1st permanent molars with clamp bands www.indiandentalacademy.com
  44. 44. IMPLANTS : Boucher: Implants are alloplastic devices which are surgically inserted into or onto jaw bone. Anchorage source: Orthopedic anchorage: - maxillary expansion - headgear like effects Dental anchorage: - space closure - intrusion ( anterior and posterior) - distalization www.indiandentalacademy.com
  45. 45. Thank u For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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