Abstract
Statement of problem
Providing a removable partial denture (RPD) can be a complex, time-consuming, and
error-prone procedure. Computer-aided design and computer-aided manufacturing (CAD-CAM)
techniques have shown promising clinical outcomes; however, the influence of manufacturing
techniques on the properties of RPD components is unclear.
Purpose
The purpose of this systematic review was to determine the accuracy and mechanical
properties of RPD components fabricated with conventional and digital methods.
Material and methods
This study followed the guidelines of the Preferred Reporting Items for Systematic
Review and Meta-analyses (PRISMA) and was registered on the international prospective
register of systematic reviews (PROSPERO) database (CRD42022353993). An electronic
search was conducted on PubMed/MEDLINE, Scopus, Web of Science, and the Cochrane Library
in August 2022. Only in vitro studies comparing the digital with the lost-wax casting
technique were included. The quality of the studies was assessed by using the methodological
index for nonrandomized studies (MINORS) scale.
Results
Of the 17 selected studies, 5 evaluated the accuracy of RPD components as well as
the mechanical properties, 5 studies evaluated only the component accuracy, and another
7 evaluated only the mechanical properties. The accuracy was similar regardless of
the technique, with discrepancies within clinically acceptable values (50 to 426.3
μm). The surface roughness was higher for 3D-printed clasps and lower for milled clasps
(P<.05). The metal alloy significantly influenced the porosity, with the highest number
of pores obtained by casting for Ti clasps and by rapid prototyping for Co-Cr clasps.
Conclusions
In vitro studies showed that the digital technique provided similar accuracy to that
of the conventional technique within a clinically acceptable range. The manufacturing
technique influenced the mechanical properties of RPD components.
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Article info
Publication history
Published online: March 03, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in public, commercial, or not-for-profit sectors.
Conflict of interest: There are no conflicts of interest in connection with this article. The manuscript has not been published and is not under publication or consideration for publication elsewhere.
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© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
