Comparison of four CAD-CAM guides for preparing guiding planes of removable partial dentures

Hefei Bai; Hongqiang Ye; Hu Chen; Yong Wang; Yongsheng Zhou; Yuchun Sun

doi:10.1016/j.compbiomed.2022.105564

Comparison of four CAD-CAM guides for preparing guiding planes of removable partial dentures

Comput Biol Med. 2022 Jul:146:105564. doi: 10.1016/j.compbiomed.2022.105564. Epub 2022 Apr 29.

Authors

Hefei Bai¹, Hongqiang Ye², Hu Chen¹, Yong Wang¹, Yongsheng Zhou³, Yuchun Sun¹

Affiliations

¹ Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Beijing, PR China.
² Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Beijing, PR China. Electronic address: yehongqiang@hsc.pku.edu.cn.
³ Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Beijing, PR China.

PMID: 35569334
DOI: 10.1016/j.compbiomed.2022.105564

Abstract

Background and objective: To evaluate the effect of guiding structure and 3D-printing material of CAD-CAM guides on the accuracy of guiding planes preparation.

Methods: Four types of computer-aided design and computer-aided manufacturing (CAD-CAM) guides for preparing guiding planes of removable partial denture (RPD) were designed in two types of guiding structures (triple-constraint and single-plane constraint) and were 3D printed using resin and cobalt-chromium (Co-Cr) alloy. Guiding plane preparation of identical resin casts was performed using CAD-CAM guides (resin template, metal template, resin guided device, and metal guide device) in four test groups and by freehand in the control group (n = 22 per group). All prepared casts were then scanned (Test) and aligned to the reference cast with designed guiding planes. 3D compare analysis was performed and root-mean-square (RMS) values were calculated for assessing the 3D trueness and 3D precision of guiding plane preparation. The angle between the prepared guiding plane (Test) and the designed path of placement of RPD (Reference) was measured for evaluating the direction trueness.

Results: RMS values of the metal template group for 3D trueness (39.7 ± 14.6 μm) and 3D precision (28.6 ± 6.8 μm) were significantly lower than that of other groups (p < .05). For direction trueness, the metal template group showed the least angle deviation (1.09 ± 0.56°), and the freehand group demonstrated the largest angle deviation (7.03 ± 2.83°).

Conclusions: The Co-Cr alloy guides with triple-constraint guiding structure can assist to prepare accurate guiding planes of RPD.

Keywords: 3D comparison; 3D printing; CAD-CAM; Cobalt-chromium alloys; Removable partial denture; Tooth preparation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Chromium Alloys
Computer-Aided Design
Denture, Partial, Removable*
Printing, Three-Dimensional

Substances

Chromium Alloys