Mandibular asymmetry types and differences in dental compensations of Class III patients analyzed with cone-beam computed tomography

Objectives: To assess differences in dental compensation of the incisors and first molars in skeletal Class III patients with roll-, yaw-, and translation-dominant mandibular asymmetries.Materials and Methods: A total of 90 skeletal Class III adult patients (mean age, 22.00 +/- 3.31 years; range, 18-37.9 years) with facial asymmetry were enrolled and divided into the roll-, yaw-, and translation-dominant type groups (n 1/4 30 per group). The vertical, transverse, and anteroposterior distances and axial angles of the teeth were measured using cone-beam computed tomography images. The measurements were compared between the deviated and nondeviated sides using a paired t-test and among the three groups using one-way analysis of variance with a Tukey post hoc test.Results: The roll-dominant groups showed the greatest values for the bilateral difference in the vertical position of the maxillary (2.42 +/- 1.24 mm) and mandibular molars (2.23 +/- 1.28 mm; P < .001). The transverse deviations of the maxillary (2.19 +/- 1.51 mm) and mandibular incisors (-2.11 +/- 1.39 mm) were greater in the yaw-dominant groups than those of other groups. Regarding tooth axial angle, the yaw-dominant group showed the greatest tipping of the mandibular incisor (-4.13 +/- 3.30(degrees); P < .001).Conclusions: Dental compensation differed depending on the type of facial asymmetry. The roll-dominant type showed more vertical compensation of the posterior teeth, whereas the yaw dominant type exhibited more tipping of the molars and incisors. By precisely assessing dental compensation in each asymmetry type, sufficient dental decompensation could be achieved. (Angle Orthod. 2023;93:695-705.)