Influence of Maxillofacial Morphology on Temporomandibular Joint Degenerative Alterations and Condyle Position Assessed by CBCT in Class II Malocclusion Adult Patients-A Cross-Sectional Study.

Background/

Objectives

This cross-sectional analytical study investigated the relationship between the craniofacial morphology, condylar displacement, and degenerative changes in the temporomandibular joints (TMJs) in adult patients with class II skeletal malocclusion. To compare cephalometric variables, joint space dimensions, and centric slide measurements between patients with and without CBCT-confirmed TMJ degenerative alterations.

Methods

Sixty adults with class II malocclusion were divided into two equal groups (n = 30) based on the presence or absence of TMJ degenerative changes on CBCT. Joint spaces were measured, condylar displacement was evaluated using a condylar position indicator (CPI), and cephalometric analysis was performed in both maximal intercuspation and centric relation. Statistical comparisons were performed using t-tests, chi-squared tests, and Pearson's correlation analysis. Significance was set at p < 0.05.

Results

Patients with degenerative TMJ changes exhibited significantly greater overjet (p = 0.0001) and a trend toward increased ANB angles (p = 0.055). The superior joint space was reduced on the right side (p = 0.031). Condylar displacements ≥ 2 mm were more frequent in the affected group and correlated with sagittal cephalometric discrepancies (45% vs. 24% in controls).

Conclusions

Aggravated skeletal class II malocclusion with increased overjet could be associated with TMJ degenerative changes. CR-based cephalometry and CBCT evaluation may aid in diagnostic assessment, but longitudinal studies are needed to confirm the clinical relevance.