Evaluation of Maxillomandibular Transverse Dimensions and Discrepancies Based on Vertical Skeletal Patterns

Management of maxillomandibular transverse discrepancy (MTD) is essential for achieving stable, functional, and esthetic occlusion. This study aimed to evaluate the maxillomandibular transverse dimensions and discrepancies in relation to vertical skeletal patterns using digital dental casts and cone-beam computed tomography (CBCT) images. A total of 180 untreated adult subjects were classified into three vertical groups based on the SN-MP angle: hypodivergent (<27°), normovergent (27–37°), and hyperdivergent (>37°), with 60 subjects in each group. Dental arch widths using casts (DAWs-Casts) were measured at the canine, first premolar, first molar, and second molar, while basal arch widths using casts (BAWs-Casts) were measured at the mucogingival junction apical to the corresponding cusp tips. CBCT images were used to measure basal arch widths (BAWs-CBCT) at the estimated centers of resistance (CRes). DAW-Cast, BAW-Cast, and BAW-CBCT measurements were affected by vertical skeletal patterns. Therefore, maxillomandibular dimensions and discrepancies vary according to vertical skeletal pattern, underscoring the need for careful evaluation when planning treatment protocols for patients with MTD.