다양한 CAD/CAM 제조 방식으로 제작한 3본 고정성 임시 치과 보철물의 정확도 비교
Accuracy comparison of 3-unit fixed dental provisional prostheses fabricated by different CAD/CAM manufacturing methods
이혁준, 이하빈, 노미준, 김지환,
소속 상세정보
이혁준 ( Lee Hyuk-Joon ) -
이하빈 ( Lee Ha-Bin ) -
노미준 ( Noh Mi-Jun ) -
김지환 ( Kim Ji-Hwan ) -
Abstract
Purpose: This in vitro study aimed to compare the trueness of 3-unit fixed dental provisional prostheses (FDPs) fabricated by three different additive manufacturing and subtractive manufacturing procedures.
Methods: A reference model with a maxillary left second premolar and the second molar prepped and the first molar missing was scanned for the fabrication of 3-unit FDPs. An anatomically shaped 3-unit FDP was designed on computer-aided design software. 10 FDPs were fabricated by subtractive (MI group) and additive manufacturing (stereolithography: SL group, digital light processing: DL group, liquid crystal displays: LC group) methods, respectively (N=40). All FDPs were scanned and exported to the standard triangulated language file. A three-dimensional analysis program measured the discrepancy of the internal, margin, and pontic base area. As for the comparison among manufacturing procedures, the Kruskal?Wallis test and the Mann?Whitney test with Bonferroni correction were evaluated statistically.
Results: Regarding the internal area, the root mean square (RMS) value of the 3-unit FDPs was the lowest in the MI group (31.79±6.39 μm) and the highest in the SL group (69.34±29.88 μm; p=0.001). In the marginal area, those of the 3-unit FDPs were the lowest in the LC group (25.39±4.36 μm) and the highest in the SL group (48.94±18.98 μm; p=0.001). In the pontic base area, those of the 3-unit FDPs were the lowest in the LC group (8.72±2.74 μm) and the highest in the DL group (20.75±2.03 μm; p=0.001).
Conclusion: A statistically significant difference was observed in the RMS mean values of all the groups. However, in comparison to the subtractive manufacturing method, all measurement areas of 3-unit FDPs fabricated by three different additive manufacturing methods are within a clinically acceptable range.
키워드
Three-unit bridge; Additive manufacturing; Computer-aided design; Computeraided manufacturing; Liquid crystal displays printer; Subtractive manufacturing
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