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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.
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.