NDLI: Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses

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Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses

Content Provider	MDPI
Author	Song, Doo-Bin Han, Man-So Kim, Si-Chul Ahn, Junyong Im, Yong-Woon Lee, Hae-Hyoung
Copyright Year	2021
Description	This study investigated the fitting accuracy of titanium alloy fixed dental prostheses (FDP) after sequential CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) fabrication. A three-unit FDP model connecting mandibular second premolars and molars was prepared and scanned to fabricate titanium FDPs by CAD/CAM milling. A total of six FDPs were sequentially milled in one titanium alloy disk using a new set of burs every time (n = 4). The fitting accuracy of FDPs was mesiodistally evaluated by a silicone replica technique and the measurement was triplicated at four different locations: MO (marginal opening), MG (marginal gap), AG (axial gap), and OG (occlusal gap). Data were statistically analyzed using ANOVA and Tukey’s HSD test. The fitting accuracy of PMMA (polymethyl methacrylate) FDPs milled using the worn or new bur were evaluated by the same procedure (n = 6). The mean dimensions of titanium FDP for all measuring positions, except for AG, were significantly increased from the third milling. However, no difference was noted between the first FDP and the second FDP milled with the same set of burs. Severe edge chippings were observed in all milling burs. Detrimental effects of the worn burs on the fitting accuracy were demonstrated in the CAD/CAM-milled PMMA FDP. The results recommend proper changing frequency of cutting burs to achieve the quality of fit and predictable outcomes for dental CAD/CAM prostheses.
Starting Page	1401
e-ISSN	19961944
DOI	10.3390/ma14061401
Journal	Materials
Issue Number	6
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-03-13
Access Restriction	Open
Subject Keyword	Materials Dentistry and Oral Surgery Fitting Accuracy Sequential Milling Fixed Dental Prosthesis Bur Wear Cad/cam
Content Type	Text
Resource Type	Article

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