Mandibular Motion-Guided Virtual Occlusal Adjustment Experiment

To compare the precision of jaw motion analyzers (JMA) and intraoral scanner dynamic occlusion (DO) modules in recording mandibular trajectories and evaluate their trueness in guiding virtual occlusal adjustments for anterior/posterior crowns. Twelve Angle Class I participants with intact dentition were enrolled. Mandibular movements were recorded using JMA and DO during protrusive/lateral excursions. Hausdorff distances quantified trajectory precision between devices. Maxillary central incisor and mandibular first molar wear facets were virtually adjusted via JMA, DO, and average-value articulator (AVA). Three-dimensional deviations between adjusted and original crowns were analyzed using repeated-measures ANOVA. JMA demonstrated superior precision in lateral excursions compared to DO, with no significant difference in protrusion. For occlusal adjustments, JMA-guided crowns exhibited the smallest deviations in wear facet morphology, followed by DO, both outperforming AVA. Significant differences were observed among all groups. JMA achieved the highest accuracy in mandibular motion tracking and virtual occlusal adjustments, yielding wear facets closest to natural dentition. Dynamic occlusion modules provided intermediate precision, surpassing conventional virtual articulators.