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http://dx.doi.org/10.4041/kjod.2011.41.2.127

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

Tuncer, Bureu Balos (Department of Orthodontics, Gazi University Faculty of Dentistry)
Ozogul, Berk (Department of Orthodontics, Gazi University Faculty of Dentistry)
Akkaya, Sevil (Department of Orthodontics, Gazi University Faculty of Dentistry)
Publication Information
The korean journal of orthodontics / v.41, no.2, 2011 , pp. 127-137 More about this Journal
Abstract
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 ${\leq}$ 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.
Keywords
Condylar path; TMJ; Mandibular movements; Class II adolescents;
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