Abstract
Objective: To compare the reproduction trueness and precision of dental casts made by the conventional, milling and 3D printing techniques. Material and Methods: From an upper right side half-arch reference model (RM), 72 models were obtained and divided into three groups: conventional (CM), milled (MM) and printed (PM). All models were scanned and converted into standard tessellation language (.STL) files. The files were superimposed using 3D analysis software, and statistical analysis was performed using the root mean square (RMS) values obtained. The Shapiro-Wilk test was used to assess normality, and the Kruskal-Wallis test was used to compare groups (p < 0.05). The Mann-Whitney U test was used for multiple comparisons among groups (p < 0.017). Results: There were significant differences in trueness (p = 0.000; p <0.001) and precision (p = 0.000; p < 0.001) among the three dental cast groups. Regarding trueness, CM presented better results, followed by MM and PM. Regarding precision, MM showed better results, followed by PM and CM, which did not show significant differences. Conclusions: For dental cast reproduction the conventional technique has the best trueness and the milling technique has the best precision. KEYWORDS Trueness; Precision; Milling; 3D printing; Dental cast.
Highlights
In recent years, digital workflows have shown exponential development in the field of dentistry[1,2,3]
Digital workflows have shown exponential development in the field of dentistry[1,2,3]. This is due to the development of computer-aided design/computer-aided manufacturing (CAD/CAM) technology, which is divided into three components: digitalization of information, processing software and a production component that converts information into a physical object with predetermined characteristics[2,4]
The null hypothesis was that there are no significant differences in trueness among the conventional, milling or 3D printing methods used to obtain dental casts; and that there are no significant differences in precision among the conventional, milling or 3D printing methods used to obtain dental casts
Summary
Digital workflows have shown exponential development in the field of dentistry[1,2,3]. This is due to the development of computer-aided design/computer-aided manufacturing (CAD/CAM) technology, which is divided into three components: digitalization of information, processing software and a production component that converts information into a physical object with predetermined characteristics[2,4]. Digital prosthodontics enables the 3D recreation of an individual model, digital or physical[2,10]. Dental casts are extremely important in the diagnosis and treatment plan for fixed prosthodontics, considering that adaptation is the main characteristic necessary to ensure rehabilitation success and that without a physical model, the adaptation between the abutment and the prosthetic piece cannot be evaluated before the prosthesis is inserted[4,11]
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