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

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

    1. 1. ANCHORAG E INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
    2. 2. INDEX           DEFINITION CLASSIFICATION FACTORS AFFECTIONG ANCHORAGE SOURCES OF ANCHORAGE ANCHORAGE PLANNING DIFFERENT ANCHORAGES ANCHORAGE LAOSS & DEMAND ADVANCEMENT IN ANCHORAGE CONCLUSION REFERENCES www.indiandentalacademy.com
    3. 3. INTRODUCTION www.indiandentalacademy.com
    4. 4.  ANCHORAGE = RESISTANCE TO UNWANTED TOOTH MOVEMENT.  ANCHORAGE UNITS : The areas or units which provide this undesirable movement. www.indiandentalacademy.com
    5. 5. DE INIT ION F IT www.indiandentalacademy.com
    6. 6. THE SITE OF DELIVERY FROM WHICH FORCE IS EXERTED - white n gardner The nature and degree of resistance to displacement offered by an anatomic unit when used for the purpose of affecting tooth movement - GRABER  www.indiandentalacademy.com
    7. 7. CLASSIFICATION www.indiandentalacademy.com
    8. 8.  1. 2. 3.  1. 2. Acc. to manner of the force application as: Simple Stationary Reciprocal Acc. to the jaws involved as : Intra maxillary Inter maxillary www.indiandentalacademy.com
    9. 9.  1. 2. 3.  1. 2. 3. Acc. to the site of anchorage Intra oral Extra oral Muscular Acc.to the no. of anchorage units as : Simple Compound Reinforced www.indiandentalacademy.com
    10. 10.  1. 2. 3. 4. 5. 6. Acc. To white n gardner Simple Stationary Reciprocal Reinforced Inter maxillary Extra oral www.indiandentalacademy.com
    11. 11. Factors affecting anchorage www.indiandentalacademy.com
    12. 12. 1. 2.    Teeth Root forms Round – resistance is same in any direction Flat – resist tooth movement in M-D direction eg. mand. Incisors & molars , buccal roots of max. molars ( tripod arrangement of roots ) Triangular – offers greater resistance to movement. Eg. Maxillary canine & lateral incisor www.indiandentalacademy.com
    13. 13. 1. 2. 3. 4. 5. Size n no. of roots – large surface area & multirooted teeth > resistance Root length – deeper the root embeded > resistance Position of tooth in the dental arch – eg. Mandi. 2 nd molar is located bt. Two ridges of basal bone , so offer more resistance to bodily movement Inclination of tooth – axial inclination is in opposite direction to force , greater resistance Mutual support www.indiandentalacademy.com
    14. 14. 1. Basal bone – eg.hard palate & lingual surface of the mandible in anterior region. 2. The musculature – Hypotonic m. - Flaring & spacing Hypertonic m. - Collapse of the teeth lingually eg.Nance palatal button ( use of hard palate to provide resistance to mesial movement of max. molar www.indiandentalacademy.com
    15. 15. SOURCES OF ANCHORAGE www.indiandentalacademy.com
    16. 16.  1. 2. 3. 4.  1. 2. 3. 4.  INTRA –ORAL : Individual teeth Multiple tooth units Encasement (eg.Inclined planes) Occluding teeth OTHERS : Holding Arches Basal bone Neck cranium Occipital region MUSCULATURE : lip bumper www.indiandentalacademy.com
    17. 17. ANCHORAGE PLANNING www.indiandentalacademy.com
    18. 18. Depends on : 1. 2. 3. 4. 5. The number of teeth to be moved The type of teeth to be moved Type of tooth movement Periodontal condition Duration of tooth movement www.indiandentalacademy.com
    19. 19. INTRA MAXILLARY ANCHORAGE www.indiandentalacademy.com
    20. 20. Within the same jaw ( either maxilla or mandible )  Eg.Elastic chains are used to retract the anterior segment using the posterior teeth as anchorage unit.  www.indiandentalacademy.com
    21. 21. Sub- divisions 1. 2. 3. Simple Stationary Reciprocal www.indiandentalacademy.com
    22. 22. INTER MAXILLARY ANCHORAGE www.indiandentalacademy.com
    23. 23. Also called “BAKER’S ANCHORAGE”  When the anchorage units situated in the one jaw are used to provide the force required to move teeth in the opposing jaw.  SUB DIVISION : Simple Staionary Reciprocal 1. 2. 3. www.indiandentalacademy.com
    24. 24.  Eg. When class II elastics are used to retract the maxillary anteriors , the anchorage units are situated in the mandibular arch. www.indiandentalacademy.com
    25. 25.  CLASS III INTER MAXILLARY ELASTICS www.indiandentalacademy.com
    26. 26. SIMPLE ANCHORAGE www.indiandentalacademy.com
    27. 27.   When the manner & application of force is such that it tends to change the axial inclination of the tooth or teeth that form the anchorage unit in the plane of the space in which the force is applied. Simple anchorage is obtained by engaging a greater number of teeth than are to be moved www.indiandentalacademy.com
    28. 28. NT: The root surface area of the anchorage unit should be at least double that of the units to be moved. eg. Anterior retraction with the help of a HAWLEY’S appliance The movement of a single tooth using a screw appliance www.indiandentalacademy.com
    29. 29. STATIONARY ANCHORAGE www.indiandentalacademy.com
    30. 30.  When the application of force tends to displace the anchorage unit bodily in the plane of space in which force is being applied  The anchorage potential of teeth being moved bodily is considerably greater as compare to teeth being moved using a tipping force. www.indiandentalacademy.com
    31. 31.  Mandibular molars are bodily pitted against the tipping forces of the maxillary anteriors. www.indiandentalacademy.com
    32. 32. RECIPROCAL ANCHORAGE www.indiandentalacademy.com
    33. 33.    When two teeth or two sets of teeth move to an equal extend in an opposite direction . Here the root surface area of the anchorage unit is equal to that of the teeth to be moved. The effect of the forces exerted is equal. www.indiandentalacademy.com
    34. 34. • Cross Elastic To Correct Molar Cross-bite  Ni-Ti Molar Rotator  Arch expansion using a midline screw www.indiandentalacademy.com
    35. 35. SINGLE OR PRIMARY ANCHORAGE  The resistance provided by single tooth with greater alveolar support is used to move another tooth with lesser alveolar support.  Eg. Molar being used to retract a pre molar www.indiandentalacademy.com
    36. 36. COMPOUND ANCHORAGE  The resistance is provided by more than one tooth with greater support is used to move teeth with less support.  Eg. Retracting incisors using loop mechanics www.indiandentalacademy.com
    37. 37. REINFORCED ANCHORAGE www.indiandentalacademy.com
    38. 38.  The anchorage units are reinforced by the use of more than one type of resistance units. www.indiandentalacademy.com
    39. 39.  Anterior inclined plane Exerts a backward pull on the maxillary appliance through the mandible www.indiandentalacademy.com
    40. 40.  SVED BITE PLANE : Prevent from being inclined labially. www.indiandentalacademy.com
    41. 41.  A rigid labial bow : To engage labial surface of the incisor at the junction of cervical & incisal third of each crown. www.indiandentalacademy.com
    42. 42.  Banding of 2nd molar for the retraction of permanent canine www.indiandentalacademy.com
    43. 43. EXTRA ORAL ANCHORAGE www.indiandentalacademy.com
    44. 44.  The extra oral structure most commonly used are : 1. Cervical region The occiput The forehead The chin 2. 3. 4. www.indiandentalacademy.com
    45. 45. www.indiandentalacademy.com
    46. 46. Extra oral forces to augment anchorage www.indiandentalacademy.com
    47. 47. www.indiandentalacademy.com
    48. 48. www.indiandentalacademy.com
    49. 49. Advantage  The anchorage unit is far away from the actual site where the movement is taking place, so less chances of any change in the anchorage units www.indiandentalacademy.com
    50. 50. Disadvantage    Lack of patient’s co- operation Anchorage assembly is bulky & externally visible Decrease in the number of hours for which the anchorage assembly is worn, so affects quality of result achieved www.indiandentalacademy.com
    51. 51. MUSCULAR ANCHORAGE www.indiandentalacademy.com
    52. 52.    Peri oral musculature is not so strong but also resilient. The forces generated by the musculature sometimes used to bring about tooth movement. eg.Lip bumper appliance (to distalize mandibular 1st molars) www.indiandentalacademy.com
    53. 53. ANCHORAGE LOSS  It is the movement of the reaction unit or the anchor unit instead of the teeth to be moved. www.indiandentalacademy.com
    54. 54. ANCHORAGE DEMAND  Depending on anchorage loss : - 1. Maximum anchorage case Moderate anchorage case Minimum anchorage case 2. 3. www.indiandentalacademy.com
    55. 55. Maximum anchorage cases  Anchorage demand is very high  Not more than ¼ th of the extraction space should be lost by forward movement of the anchor teeth www.indiandentalacademy.com
    56. 56. Moderate anchorage cases  Anchor teeth can be permitted to move forward into ¼ th to ½ of the extraction space. www.indiandentalacademy.com
    57. 57. Minimum anchorage cases  Anchorage demand is very low www.indiandentalacademy.com
    58. 58. ADVANCEMENT IN ANCHORAGE www.indiandentalacademy.com
    59. 59. www.indiandentalacademy.com
    60. 60. www.indiandentalacademy.com
    61. 61. www.indiandentalacademy.com
    62. 62. www.indiandentalacademy.com
    63. 63. www.indiandentalacademy.com
    64. 64. www.indiandentalacademy.com
    65. 65. www.indiandentalacademy.com
    66. 66. Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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