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KMID : 0355220070320030293
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Journal of Korean Academy Oral Medicine
2007 Volume.32 No. 3 p.293 ~ p.303
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The Relationship between Anterior Disc Displacement without Reduction and Development of Anterior Open Bite
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Hur Yun-Kyung
Ko Myung-Yun
An Yong-U
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Abstract
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The purpose of this paper is to evaluate if there is a relationship between anterior disc displacement without reduction and development of anterior open bite, and a relation between occurrence of open bite and occlusal appliance therapy.
In general, the statistically significant differences were found between the Group 1 and 2 and normal mean group. The variables that represent mandibular size and form, showed a statistical significance in all 3 groups. Also 3 groups patients had a smaller ANB, a larger FMA than normal mean group.
When we compared the 3 groups with respect to all cephalometric measurements by One-way analysis of variance (ANOVA), group 1 and 2 patients had a larger FMA, a larger SN to mandibular plane angle, a larger maxillomandibular plane angle, a larger occlusal plane to mandibular plane angle, a smaller total posterior facial height/total anterior facial height(%), and a larger gonial angle than group 3. The statistically significant differences were not found between the Group 1 and 2, and skeletal patterns were similar.
Thus, morphologic features of patients with vertical discrepancies may represent a risk factor for the development of anterior open bite with or without occlusal appliance treatment. In case of patients with vertical discrepancy, we may have to be more careful when inducing a change of the vertical dimension.
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KEYWORD
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Anterior disc displacement, Occlusal appliance, Open bite, Vertical discrepancies
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