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        Differences in opening and protrusive mandibular movements between Class I and II malocclusions in healthy adolescents

        Burcu Balos Tuncer,Berk Ozoğul,Sevil Akkaya 대한치과교정학회 2011 대한치과교정학회지 Vol.41 No.2

        Objective: The aim of the study was to compare the opening and protrusive mandibular movements between Class I and Class II malocclusions in healthy adolescents by clinical and axiographic evaluations. Methods: Mechanical axiography was performed on non-orthodontically treated, temporomandibular disorder (TMD)-free adolescents (12 - 16 years) with Class I (n = 38, 16 boys, 22 girls) or Class II (n = 40, 19 boys, 21 girls) malocclusion. Opening and protrusive movements were measured clinically and axiographically. Intergroup comparisons were evaluated by t-tests. Results: In opening movement, the maximum clinical opening capacity was significantly different (p ≤ 0.05) between the groups. In protrusive movement, the Class II group had significantly greater maximum clinical protrusion (p < 0.001) and maximum axiographic protrusive length (p < 0.01) than the Class I group. No significant difference in the other opening and protrusive axiographic measurements was observed. Conclusions: TMD-free adolescents with Class II malocclusion have increased protrusive capacity compared with TMD-free adolescents with Class I malocclusion; however, the detected differences could be normal variations during adolescence.

      • SCOPUSSCIEKCI등재

        Differences in opening and protrusive mandibular movements between Class Ⅰ and Ⅱ malocclusions in healthy adolescents

        Burcu Balos Tuncer,Berk Ozo?ul,Sevil Akkaya 대한치과교정학회 2011 대한치과교정학회지 Vol.41 No.2

        The aim of the study was to compare the opening and protrusive mandibular movements between Class Ⅰ and Class Ⅱ malocclusions in healthy adolescents by clinical and axiographic evaluations. Methods: Mechanical axiography was performed on non-orthodontically treated, temporomandibular disorder (TMD)-free adolescents (12 - 16 years) with Class Ⅰ (n = 38, 16 boys, 22 girls) or Class Ⅱ (n = 40, 19 boys, 21 girls) malocclusion. Opening and protrusive movements were measured clinically and axiographically. Intergroup comparisons were evaluated by t-tests. Results: In opening movement, the maximum clinical opening capacity was significantly different (p ≤ 0.05) between the groups. In protrusive movement, the Class Ⅱ group had significantly greater maximum clinical protrusion (p < 0.001) and maximum axiographic protrusive length (p < 0.01) than the Class I group. No significant difference in the other opening and protrusive axiographic measurements was observed. Conclusions: TMD-free adolescents with Class Ⅱ malocclusion have increased protrusive capacity compared with TMD-free adolescents with Class Ⅰ malocclusion; however, the detected differences could be normal variations during adolescence.

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