COMPARATIVE STUDY OF MANDIBULAR CONDYLAR SPATIAL RELATIONSHIP AND MORPHOLOGY IN SKELETAL CLASS II MALOCCLUSION PATIENTS WITH DIFFERENT VERTICAL SKELETAL PATTERN

Objective: the study aims to compare the mandibular condyle-fossa spatial relationship and morphologies in asymptomatic skeletal class II patients with different vertical skeletal pattern. Method and material: Cone-beam computed tomography (CBCT) images of 68 adult patients (136 TMJ) were recruited. Four groups of 17 CBCT images each were made according to their ANB and mandibular plane (SN-MP) angles: class II low SN-MP angle (CII-LA), class II normal SN-MP angle (CII-NA), class II high SN-MP angle (CII-HA) and class I normal SN-MP angle (CI-NA). Condyle-fossa spatial relationship and morphologies were compared among groups. Results: Condylar position of skeletal class II patients in low, normal, and high angle groups were dominantly positioned concentrically, posteriorly and anteriorly respectively, while the condyles of (CI-NA) group tended to positioned concentrically and anteriorly. TMJ morphology appeared to be more affected by vertical skeletal pattern than sagittal one. Abnormal condylar morphology was typical in high angle group. Conclusions: Both vertical and sagittal skeletal class II showed a significant correlation with the position of the condyle. Vertical skeletal morphology has more influence on TMJ morphology than sagittal skeletal type. This relationship should be regarded during orthodontic treatment to early predict and establishing proper treatment for the temporomandibular disorder