Abstract
Objective. The purpose of this study is to investigate the Craniomandibular articulation morphology and position of condyle in mandibular fossae in Angle's class I normal occlusion and Angle's class II division 1 malocclusion. Materials and Methods. The present study was conducted on 40 subjects with 20 subjects in each group, and the computed tomography images were obtained using spiral computed tomography technique. Each measurement was compared by two-factor analysis of variance (ANOVA) while changes in anterior and posterior joint spaces were done by paired t-test. Results. Statistically significant anterior positioning of condyle (P > 0.05) was observed in class I normal malocclusion, and it was significant only on right side in class II division 1 malocclusion. Conclusions. There was no difference found in the condylar process and joint morphology between right and left sides of both Angle's Class I normal occlusion and Angle's class II division 1 malocclusion. Evaluation of the position of the condyles in their respective mandibular fossae showed concentric position with a tendency towards anterior positioning for both right and left sides of the subjects with Angle's Class I normal occlusion as well as subjects with Angle's class II division 1 malocclusion.
Highlights
The Craniomandibular articulation (CMA) is a bicondylar articulation [1], with the mouth closed; the condyle is located in a centric position in glenoid fossae
The descriptive statistics for each measurement analyzed in the comparison of structures on left and right sides are shown in Table 1, for both the group of subjects with class I normal occlusion and subjects with class II division 1 malocclusion
In the present study CMA morphology was studied in the subjects with the age ranging from 14 to 25 years as it is reported in literature [16, 17] that mandibular fossae attain their adult sizes before the age of 8 and did not show significant change after this age
Summary
The Craniomandibular articulation (CMA) is a bicondylar articulation [1], with the mouth closed; the condyle is located in a centric position in glenoid fossae. The influence of occlusion on the joint morphology is still not completely understood. Some investigators have indicated that occlusal factors are related to joint morphology [2, 3] whereas others have failed to demonstrate such a correlation [4, 5]. The morphology and function are intimately related. The loads to which the CMA is subjected vary according to the subjects’ dentofacial morphologies. It can be suggested that both the condyle and the mandibular fossa differ in morphology in subjects with various malocclusions [6]
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