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KMID : 0362120150370010009
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Journal of Technologic Dentistry
2015 Volume.37 No. 1 p.9 ~ p.15
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The comparison of accuracy on three-unit fixed dental prosthesis made with CAD/CAM milling machines
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Bae So-Yeon
Park Jin-Young
Kim Ji-Hwan
Kim Hae-Young
Kim Myung-Bae
Kim Woong-Chul
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Abstract
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Purpose: The purpose of this study was to compare the accuracy of the maxillary three-unit fixed dental prosthesis (FDPs) made using two CAD/CAM milling machines : DCM Group(Dentaim CAD/CAM milling machine), WCM Group(Wieland CAD/CAM milling machine).
Methods: Each of 10 duplicate models was scanned by blue light scanner(Identica, Medit, Korea), and the three-unit FDPs (STL file) was designed using DelcamCAD. A total of 20 three-unit FDPs was fabricated, comprising 2 groups of 10 specimens each (shrinkage ratio is 1:1). The first three-unit FDPs STL file was used as a CAD reference model (CRM). Obtained STL files by scanning the inner surface of three-unit FDPs were convened into the point clouds-ASC II files. Discrepancies between the point clouds and CRM were measured by superimposition software. Statistical methods to analyze the data were used non-parametric method. The mean (SD) values were compared by a Mann-Whitney U-test. Type one error rate was set at 0.05.
Results: WCM group had small discrepancies with 2.17μm of mean value compared to 4.44μm in DCM group. The accuracy values between the two groups showed a sratistically significant difference (Table 2, p<.05).
Conclusion: The accuracy of the three-unit fixed dental prosthesis(FDPs) made of two CAD/CAM milling machines were statistically different. Accuracy with which the prosthesis made of WCM group was superior.
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KEYWORD
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Dental CAD/CAM system, Accuracy, Three-dimensional superimposition analysis
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