Accuracy of CAD-CAM systems for removable partial denture framework fabrication: A systematic review

Objective. Analyzing and comparing the fit and accuracy of removable partial denture (RPDs) frameworks fabricated with CAD/CAM and rapid prototyping methods with conventional techniques. Materials and Methods. The present systematic review was carried out according to PRISMA guidelines. The search was carried out on PubMed/MEDLINE, Cochrane collaboration, Science direct, and Scopus scientific engines using selected MeSH keywords. The articles fulfilling the predefined selection criteria based on the fit and accuracy of removable partial denture (RPD) frameworks constructed from digital workflow (CAD/CAM; rapid prototyping) and conventional techniques were included. Results. Nine full-text articles comprising 6 in vitro and 3 in vivo studies were included in this review. The digital RPDs were fabricated in all articles by CAD/CAM selective laser sintering and selective laser melting techniques. The articles that have used CAD/CAM and rapid prototyping technique demonstrated better fit and accuracy as compared to the RPDs fabricated through conventional techniques. The least gaps between the framework and cast ( 41.677 ± 15.546 μ m ) were found in RPDs constructed through digital CAD/CAM systems. Conclusion. A better accuracy was achieved using CAD/CAM and rapid prototyping techniques. The RPD frameworks fabricated by CAD/CAM and rapid prototyping techniques had clinically acceptable fit, superior precision, and better accuracy than conventionally fabricated RPD frameworks.

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Computer-aided technology for fabricating removable partial denture frameworks: A systematic review and meta-analysis

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2020.06.006 ◽

2021 ◽

Author(s):

Mariana Domingues Pordeus ◽

Joel Ferreira Santiago Junior ◽

Helena Sandrini Venante ◽

Rodrigo Moreira Bringel da Costa ◽

Ana Paula Chappuis Chocano ◽

...

Keyword(s):

Systematic Review ◽

Meta Analysis ◽

Removable Partial Denture ◽

Partial Denture ◽

Computer Aided

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Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

Brazilian Dental Journal ◽

10.1590/0103-6440201801916 ◽

2018 ◽

Vol 29 (4) ◽

pp. 342-346

Author(s):

Eduardo Piza Pellizzer1 ◽

Caroline Cantieri de Mello ◽

Jéssica Marcela de Luna Gomes ◽

Joel Ferreira Santiago Júnior ◽

Cleidiel Aparecido Araújo Lemos ◽

...

Keyword(s):

Reference Model ◽

Optical Microscope ◽

The Other ◽

Marginal Adaptation ◽

Nicr Alloy ◽

Partial Denture ◽

Optical Scanning ◽

Fixed Partial Denture ◽

Cad Cam ◽

Cam Systems

Abstract The aim of this is was evaluate the vertical and horizontal marginal adaptation of 3-unit fixed partial denture frameworks fabricated using different techniques and CAD/CAM systems. A total of 40 framework specimens were fabricated and divided into four groups as follows: lost-wax casting (G1); lost-wax casting with welding (G2); extraoral optical scanning of models (3S/DWOS) (G3); intraoral optical scanning (Cerec Bluecam/Sirona) (G4). A reference model was used to simulate a fixed partial denture with three elements (with a central pontic). The frameworks of G1 and G2 were cast in nickel-chromium (NiCr) alloy, whereas those of G3 and G4 were milled in zirconia. In all groups, vertical and horizontal marginal adaptation (over-contour and under-contour) was evaluated using a three-dimensional optical microscope (Quick Scope, Mitutoyo). The results showed higher vertical marginal misfit in G1 than in the other groups (p<0.001). Regarding horizontal marginal misfit, higher over-contour values occurred in G3 than in the other groups (p<0.001). G3 did not show under-contour at all, whereas the other groups did not differ from each other in this regard (p>0.05). Within the limitations of this study, it can be concluded that lost-wax casting with welding is a viable alternative to the use of CAD/CAM systems to fabricate frameworks of three-unit FPDs, since the techniques yielded similar vertical misfit values. Extra-oral CAD/CAM systems showed the highest horizontal misfit (over-contour) compared to other groups.

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