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

Area of Science:

• Dental Technology
• Biomaterials Engineering
• Digital Dentistry

Background:

• Accurate intermaxillary relation recording is crucial for virtual adjustment of dental restorations.
• Traditional methods can be time-consuming and less precise for complex digital workflows.
• Digital technologies offer potential improvements in accuracy and efficiency for restorative dentistry.

Purpose of the Study:

• To compare the effectiveness of four intermaxillary relation recording methods in guiding virtual adjustments of all-ceramic restorations.
• To evaluate the precision of digital techniques versus traditional methods for occlusal adjustments.
• To identify the optimal digital method for minimizing occlusal interferences in restorative dentistry.

Main Methods:

• Twelve participants underwent intermaxillary relation recording using traditional methods, 3Shape TRIOS3 dynamic scans, Zebris mandibular motion trajectories, and Zebris articulator parameters.
• Virtual adjustments were performed on four types of all-ceramic restorations (single anterior/posterior crowns, two posterior crowns, three-unit bridge).
• Three-dimensional (3D) occlusal surface deviations between natural teeth and restorations were quantified to assess accuracy.

Main Results:

• All three digital intermaxillary relation recording methods met clinical requirements.
• The Zebris trajectory group showed significantly smaller 3D deviations than the 3Shape dynamic scan group, indicating superior performance in eliminating occlusal interferences.
• The Zebris trajectory group demonstrated significantly reduced 3D deviations in the single anterior tooth subgroup compared to the Zebris articulator parameter group.

Conclusions:

• Digital intermaxillary relation recording techniques matched or exceeded traditional methods in eliminating occlusal interferences.
• The Zebris mandibular motion trajectory recording technique proved superior to the 3Shape dynamic recording method for virtual restoration adjustments.
• The Zebris system's application for guiding virtual adjustments outperformed 3Shape dynamic occlusion in clinical significance.