3D 프린팅 의치상 인공치아의 인접면 연결부위 두께 및 후경화에 따른 3차원 진실도 평가
Three-dimensional trueness of 3D-printed denture base teeth according to proximal connection thickness and post-curing
Purpose: This study was conducted to evaluate the effect of post-curing and interproximal connection thickness on the three-dimensional (3D) trueness of artificial teeth for 3D-printed dentures. Methods: Complete-arch artificial teeth were designed with interproximal connection thicknesses of 60%, 80%, and 100%, and 10 specimens were fabricated for each group using a digital light processing printer. Specimens were scanned before and after post-curing, and the scan data were superimposed on reference data using best-fit alignment. 3D trueness was evaluated based on deviation measurements and color difference maps. Data were analyzed using the Kruskal–Wallis and Wilcoxon signed-rank tests. Results: Before post-curing, median deviations were 94.30, 91.70, and 86.95 μm for the 60%, 80%, and 100% groups, respectively, with a significant difference among the groups (p=0.002). After post-curing, median deviations increased to 140.30, 121.65, and 119.40 μm, respectively, with a significant difference among groups (p=0.001). Significant differences between pre- and post-curing measurements were observed for all connection thicknesses (p=0.005). Color difference maps showed greater negative deviations after postcuring and relatively broader areas of low deviation in the 100% group than in the 60% group. Conclusion: Post-curing significantly affected 3D trueness across all connection thicknesses. Greater interproximal connection thicknesses were associated with lower deviations and improved dimensional stability. Therefore, connection thickness and dimensional changes induced by post-curing should be considered when designing 3D-printed denture prostheses.
목차
Abstract NTRODUCTION MATERIALS AND METHODS 1. 연구 설계 2. 주모형 선정 및 스캔 파일 획득 3. 인공치아 디자인 설계 4. 3D 프린팅 출력(DLP 유형), 재스캔(re-scan) 5. 3차원 중첩 6. 통계 분석 RESULTS DISCUSSION CONCLUSIONS FUNDING ACKNOWLEDGEMENTS CONFLICT OF INTEREST ORCID REFERENCES