Digital light processing 방식으로 제작한 임시 크라운의 정확도에 대한 다양한 적층 각도와 레이어 두께의 영향
Effects of various build directions and layer thicknesses on the accuracy of provisional crowns fabricated using the digital light processing method
Purpose: This study aims to compare the internal and marginal accuracy of provisional crowns fabricated using the digital light processing (DLP) three-dimensional (3D) printing method, considering build directions of 0° and 90°, as well as layer thicknesses of 50 μm, 75 μm, and 100 μm. Methods: Provisional crowns were fabricated using a DLP 3D printer, and six experimental groups were created, each comprising 10 specimens. Provisional crowns were designed with computer-aided design software and printed using a liquid resin material. Internal and marginal accuracy were assessed using root mean square (RMS) values. Statistical analyses, including two-way ANOVA and Tukey HSD tests (α=0.05), were conducted to evaluate the effects of build direction and layer thickness on RMS values. Results: For the trueness of the internal surface, the lowest RMS value (31.56±4.47 μm) was observed at a 0° build direction with a layer thickness of 100 μm. At 90° with 100 μm, the RMS value was 64.72±4.96 μm (p<0.05). Marginal trueness at a 0° build direction with 75 μm showed the lowest value of 31.88±6.89 μm, while at 90° with 75 μm it was 85.40±22.45 μm (p<0.001). Differences between build direction and layer thickness combinations were confirmed for both internal and marginal trueness (p<0.001). Conclusion: The effects of build directions (0°, 90°) and layer thicknesses (50 μm, 75 μm, 100 μm) on the internal and marginal accuracy of printed crowns were analyzed, revealing a significant interaction in both internal and marginal trueness.
목차
Abstract INTRODUCTION MATERIALS AND METHODS 1. 시편 제작 2. 3차원 정확도 분석 3. 통계 분석 RESULTS DISCUSSION CONCLUSIONS FUNDING ACKNOWLEDGEMENTS CONFLICT OF INTEREST ORCID REFERENCES