Impact of Post-orthodontic Dental Occlusion on Masticatory Performance

Whether precise orthodontic detailing of occlusion impacts masticatory function is unknown. Here, we aim to assess the impact of post-orthodontic occlusion on masticatory performance. Fifty-four adults who completed orthodontic treatment were categorized into two groups using the American Board of Orthodontics (ABO) model grading system: one meeting ABO standards (ABO, N=29), the other failing to meet them (non-ABO, N=25). Surface electromyography and experimental chewing tests of silicone food were used to assess jaw muscle coordination during static and dynamic tests, and masticatory performance. Visual analogue scales were used for self-assessment of chewing function. The ABO group had more symmetric activation of the temporalis muscle during clenching (P=0.016) and chewed at a slower rate (P=0.030). Median particle size, broadness of particle distribution, and self-rating of chewing function did not differ between groups (all P>0.05). This study demonstrated that meeting ABO standards contributes to more balanced activation of jaw muscles during function.M.Sc