Tran Nguyen Chi, Nguyen Nhat Dinh Minh, Huynh Nam Cong Nhat, Tran Trang Thi Ngoc, Hoang Hung Trong, Wang Ding Han, Hsu Ming Lun
Faculty of Dentistry, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, 749000, Vietnam.
Nikkori Dental Clinic, Ho Chi Minh City, 749000, Vietnam.
J Clin Exp Dent. 2025 Apr 1;17(4):e366-e373. doi: 10.4317/jced.62249. eCollection 2025 Apr.
Composite resin build-up translucency affects the accuracy of digital impressions generated by an intraoral scanning system (IOS). Here, we evaluated the influence of composite core translucency on the accuracy of a CAD-CAM bridge (Fixed Partial Denture) using an intraoral scanner.
We investigated the accuracy (the trueness and precision) of 2 different composites (EverX Flow-EX and G-aenial Universal Injectable A3) for core build up in 3-unit CAD/CAM bridge on anterior teeth using an intra-oral scanner (Trios 3, 3Shape) and injectable technique. The fitting of crown within the clinical acceptable threshold of final restoration was also confirmed by CBCT superimposition.
The results illustrated that composite with high translucency (A3) expressed lower trueness value than one with low translucency. With a clinically acceptable threshold<50μm, the percentage of points over the threshold was lower in composite group with low translucency (EX). CAD/CAM restorations on high translucency composite-reconstructed abutments showed a poor fit compared with the low translucency group on both abutments.
The use of low translucency reconstructive materials helps to reduce the errors of IOS, and at the same time, appropriate compensation should be used when designing restorations to provide the most accurate results. Clinical Significance: • Composite with high translucency (A3) expressed lower trueness value than one with low translucency (EX). • With a clinically acceptable threshold<50μm, the percentage of points overcoming the threshold was lower in composite group with low translucency (EX). • Appropriate compensation should be applied when designing CAD/CAM restoration to achieve the best results. Accuracy, intraoral-scanner, digital dentistry, resin composite, bridge prosthesis, CAD/CAM.
复合树脂堆塑的透明度会影响口腔内扫描系统（IOS）生成的数字印模的准确性。在此，我们使用口腔内扫描仪评估了复合树脂核透明度对计算机辅助设计与制造（CAD-CAM）桥体（固定局部义齿）准确性的影响。
我们使用口腔内扫描仪（Trios 3，3Shape）和注射技术，研究了两种不同的复合树脂（EverX Flow-EX和G-aenial Universal Injectable A3）在前牙3单位CAD/CAM桥体核堆塑中的准确性（真实性和精确性）。最终修复体在临床可接受阈值内的冠部贴合情况也通过锥形束计算机断层扫描（CBCT）叠加进行了确认。
结果表明，高透明度的复合树脂（A3）的真实性值低于低透明度的复合树脂。在临床可接受阈值<50μm时，低透明度复合树脂组（EX）超过阈值的点的百分比更低。与低透明度复合树脂重建基牙组相比，高透明度复合树脂重建基牙上的CAD/CAM修复体贴合性较差。
使用低透明度的重建材料有助于减少IOS的误差，同时，在设计修复体时应使用适当的补偿以提供最准确的结果。临床意义：• 高透明度的复合树脂（A）的真实性值低于低透明度的复合树脂（EX）。• 在临床可接受阈值<50μm时，低透明度复合树脂组（EX）超过阈值的点的百分比更低。• 在设计CAD/CAM修复体时应应用适当的补偿以获得最佳效果。准确性、口腔内扫描仪、数字牙科、树脂复合材料、桥体修复体、CAD/CAM
