Mandibular growth changes induced by directionally applied ortodontic forces in Macaca Mulatta monkeys,
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Abstract
Many patients treated by orthodontists have problems involving abnormal anteroposterior jaw relationships. The occlusion and tooth relationships are poor because the jaws are not related properly. However, not all basal bone discrepancies are anteroposterior. There are vertical problems as well, such as anterior open bite in which the ramus may be short or the gonial angle more obtuse than normal. The orthodontist may have to modify his treatment and limit his objectives when there is a large discrepancy between maxillary and mandibular bony bases especially in skeletal Class II malocclusions. A clinical method which could favorably influence the direction of growth of the mandible in skeletal Class II and open bite malocclusions would be a major contribution to orthodontic therapy. [55]
Considerable variation of opinion exists among orthodontists regarding the effects of orthodontic mechanotherapy on growth of the mandible. [28,78,85,92] At the beginning of the twentieth century it was hoped that intermaxillary Class II elastics would stimulate mandibular growth. [3] However, this hope has not been shown to be fulfilled. [78]
With this background of need for a method to influence the direction of growth of the mandible, a review of the literature revealed extensive opinions on both sides of the question of whether it is possible or not. It was therefore decided to examine the effects of a fulcrum orthodontic appliance on the growth of the mandible. The purposes are:
1. To determine if growth changes in the glenoid fossa, condyle, neck of the condyle, gonial angle or body of the mandible can be induced by mechanical means.
2. To determine the amount and direction of growth of the condyle and fossae.
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Typewritten.
Appendix: 37 figures.
Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, March 1968.
Bibliography: p. 76-85.
Appendix: 37 figures.
Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, March 1968.
Bibliography: p. 76-85.
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