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KMID : 1023820180100050354
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The Journal of Advanced Prosthodontics
2018 Volume.10 No. 5 p.354 ~ p.360
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Accuracy of provisional crowns made using stereolithography apparatus and subtractive technique
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Kang Seen-Young
Park Jung-Hyun
Kim Ji-Hwan
Kim Woong-Chul
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Abstract
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PURPOSE: To compare and analyze trueness and precision of provisional crowns made using stereolithography apparatus and subtractive technology.
MATERIALS AND METHODS: Digital impressions were made using a master model and an intraoral scanner and the crowns were designed with CAD software; in total, 22 crowns were produced. After superimposing CAD design data and scan data using a 3D program, quantitative and qualitative data were obtained for analysis of trueness and precision. Statistical analysis was performed using normality test combined with Levene test for equal variance analysis and independent sample t-test. Type 1 error was set at 0.05.
RESULTS: Trueness for the outer and inner surfaces of the SLA crown (SLAC) were 49.6±9.3 μm and 22.5±5.1 μm, respectively, and those of the subtractive crown (SUBC) were 31.8±7.5 μm and 14.6±1.2 μm, respectively. Precision values for the outer and inner surfaces of the SLAC were 18.7±6.2 μm and 26.9±8.5 μm, and those of the SUBC were 25.4±3.1 μm and 13.8±0.6 μm, respectively. Trueness values for the outer and inner surfaces of the SLAC and SUBC showed statistically significant differences (P<.001). Precision for the inner surface showed significance (P<.03), whereas that for the outer surface showed no significance (P<.58).
CONCLUSION: The study demonstrates that provisional crowns produced by subtractive technology are superior to crowns fabricated by stereolithography in terms of accuracy.
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KEYWORD
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Stereolithography apparatus, Subtractive technology, Provisional crown, CAD/CAM system
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