Comparing Four Maxillomandibular Relation Recording Methods for Virtual Adjustment of All-Ceramic Restorations: An...

To compare the effectiveness of four maxillomandibular relation recording methods for guiding the virtual adjustment of all-ceramic restorations.

A total of 12 participants underwent buccal maxillomandibular relation recording using traditional methods (Control group), 3Shape TRIOS 3 dynamic scans (SD group), Zebris mandibular motion trajectories (ZT group), and Zebris articulator parameters (ZP group). Virtual adjustments were performed for four restoration types: single anterior/ posterior crowns, two posterior crowns, and three-unit fixed bridge. 3D occlusal surface deviations between the natural teeth and restorations were measured.

All three digital maxillomandibular relation recording methods met clinical requirements. The Zebris trajectory group demonstrated significantly smaller 3D deviations compared to the 3Shape dynamic scan group (P < .05), exhibiting superior performance in eliminating occlusal interferences of restorations. Notably, the Zebris trajectory group showed significantly reduced 3D deviations only in the single anterior tooth subgroup compared to the Zebris articulator parameter group (P < .05), indicating better efficacy in removing restorative occlusal interferences.

The three digital techniques matched or exceeded traditional methods in eliminating occlusal interferences, with the Zebris mandibular motion trajectory recording technique demonstrating superiority over the 3Shape dynamic recording method.