Purpose: To compare the trueness of liquid crystal display (LCD) 3D-printed orthodontic models generated from cone-beam computed tomography (CBCT) and an intraoral scanner (IOS) and assess their clinical applicability. Methods: A standardized dental master cast was digitized with a high-precision optical scanner to generate a reference standard tessellation language file. The cast was scanned 10 times using CBCT and 10 times using an IOS, and each dataset was used to print a model with an LCD 3D printer (n=20). After post-curing, all printed models were rescanned and compared with the reference data using 3D best-fit alignment. Root mean square (RMS) deviation values were calculated and analyzed using the Shapiro–Wilk test, Levene’s test, and an independent t-test (α=0.05). Results: The IOS group showed significantly lower RMS deviation than the CBCT group, with mean RMS values of 106.20±3.29 μm and 122.50±1.84 μm, respectively (p<0.001). Color difference map analysis showed a uniform green distribution across the surface in Group A. In contrast, Group B showed increased red areas on the buccal and lingual posterior surfaces and irregular blue areas on the occlusal surfaces. Conclusion: The accuracy of LCD 3D-printed orthodontic models was significantly affected by the data acquisition method, with IOS-derived models showing superior trueness compared with CBCT-derived models. However, both methods remained within clinically acceptable limits, supporting their use for orthodontic diagnosis and appliance fabrication.
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Abstract INTRODUCTION MATERIALS AND METHODS 1. 마스터 모델 제작 및 데이터 획득 2. 구강 스캐너 및 콘빔 전산화단층촬영 데이터의 STL 파일추출 3. LCD 프린터를 활용한 시편 출력 4. 3차원 진실도 분석 5. 통계 분석 RESULTS DISCUSSION CONCLUSIONS FUNDING ACKNOWLEDGEMENTS CONFLICT OF INTEREST ORCID REFERENCES