Prevalence and Morphological Patterns of Mandibular Asymmetries in a Mexican Population: A CBCT-Based Analysis

Background: Mandibular asymmetries are complex craniofacial conditions that can impact facial esthetics, function, and psychosocial well-being. Accurate diagnosis is crucial for planning individualized orthodontic and surgical treatment. Objective: To evaluate the prevalence, severity, and morphological classifications of mandibular asymmetries in a Mexican population using cone-beam computed tomography (CBCT). Materials and methods: A cross-sectional study was conducted involving 231 patients aged 9–65 years from the orthodontic clinic at Universidad Autónoma de San Luis Potosí. Mandibular asymmetry was assessed using CBCT scans, categorized by the deviation of the mandibular symphysis (DMS) as mild (0–2 mm), moderate (2.1–5 mm), or severe (>5 mm). Severe asymmetries were further classified according to Obwegeser and Makek’s system. Descriptive and inferential statistics were used to analyze differences in condylar and mandibular dimensions. Results: Among 231 participants, 18 cases (7.8%) presented with severe mandibular asymmetry. Asymmetry of the glenoid fossa (AGF) was the most common classification (38.89%), followed by hemimandibular elongation (HE) at 27.78%. Severe deviations predominantly occurred on the right side (61.11%). No statistically significant differences were observed between male and female participants in terms of asymmetry type or severity. Conclusion: CBCT imaging provides detailed visualization for detecting and classifying mandibular asymmetries. AGF and HE were the most frequent morphological types in this Mexican population, with a predominance of right-sided deviation. These findings underscore the need for population-specific diagnostic protocols and highlight the clinical value of 3D imaging in asymmetry evaluation. Keywords: Mandibular asymmetry; cone-beam computed tomography; craniofacial morphology; hemimandibular elongation; glenoid fossa asymmetry.