Journal of Prosthodontics News   August 24, 2021

Comparative Study of the Accuracy of Dental CAD Programs in Designing Fixed Partial Denture


Now online in the Journal of Prosthodontics, a report on the accuracy and trueness of the computer-aided design of a three-unit fixed prosthesis.

There are many types of CAD programs and clinicians may not be fully aware of the detailed specifications of each program. Testing for the possible occurrence of errors in each step of the CAD/CAM process has received less attention than improving the accuracy of 3D dental scanners.

For this study, three CAD programs (Exocad, Dental System™, and inLab 16) were tested on the designs of a three-unit fixed partial denture, and a 3D analysis program was used to calculate the internal clearance error for the computer-aided design prostheses.

The authors used a novel method based on a triple-scan protocol to achieve accurate positioning of the abutment model and CAD prosthesis without additional correction. The CAD prosthesis-abutment model file was used as the reference; the outer contour of the CAD prosthesis-abutment model was used for positioning each CAD prosthesis file and the abutment model file supplied a reference area that was wide enough to position both elements accurately.

The accuracy of computer-aided design differed according to the type of computer-aided design program. Best trueness at the margins, axial walls, and the occlusal surface was achieved with the Dental System™ 2017, followed by Exocad 2017, and inLab 16.

Lee Y-s, Kim SY, Oh KC, Moon H-S. A comparative study of the accuracy of dental cad programs in designing a fixed partial denture. J Prosthodont 2021. https://doi.org/10.1111/jopr.13406


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