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Comparison of computer generated occlusal surfaces with functionally waxed-on surfaces.

C Ellerbrock¹, B Kordass

¹mail@dvt-praxis.com

International Journal of Computerized Dentistry

|June 11, 2011

Summary

Computer-aided design/computer-aided manufacturing (CAD/CAM) restorations show slight differences compared to traditional dental technician methods. While CAD/CAM offers comparable occlusal surfaces, manual waxing in an articulator remains more precise.

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Published on: December 20, 2024

Area of Science:

Dental Materials Science
Biomaterials Engineering
Digital Dentistry

Background:

Computer-aided design/computer-aided manufacturing (CAD/CAM) is increasingly utilized for fabricating complete anatomical dental restorations.
Automated, computer-assisted methods are crucial for accurately generating occlusal surfaces in prosthodontics.

Purpose of the Study:

To compare the accuracy of computer-generated occlusal surfaces using CAD/CAM technology with those created through manual functional waxing by experienced dental technicians.
To evaluate the volumetric and surface deviations between CAD/CAM and manually waxed occlusal surfaces.

Main Methods:

Comparison of occlusal surfaces from twelve posterior teeth in eleven healthy patients.
Analysis of volumetric differences and mean pixel deviation between computer-generated and manually waxed occlusal surfaces.
Utilized individually programmed articulators for functional waxing and digital superimposition for deviation analysis.

Main Results:

A mean volume difference between 380-530 µm was observed between CAD/CAM and manually waxed occlusal surfaces.
A mean pixel deviation of 5.12 ± 1.951 µm (range: 2.49–9.16 µm) was measured.
Deviations were noted in both non-functional and functional occlusal areas, indicating areas for potential improvement in CAD/CAM algorithms.

Conclusions:

CAD/CAM methods can produce comparable occlusal surfaces for dental restorations.
Functionally waxed occlusal surfaces, created by experienced technicians using individually programmed articulators, demonstrate higher precision than current CAD/CAM generated surfaces.
Further refinement of CAD/CAM technology is needed to fully replicate the accuracy of manual functional waxing.