OMFS IMPATH Research Group, Faculty of Medicine, Department of Imaging and Pathology, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, 3000 Leuven, Belgium.
Department of Dentistry, Royal Medical Services, Jordanian Armed Forces, 00962 Amman, Jordan.
Int J Environ Res Public Health. 2019 Feb 11;16(3):496. doi: 10.3390/ijerph16030496.
(1) Background: Three-dimensional printing is progressing rapidly and is applied in many fields of dentistry. Tooth autotransplantation offers a viable biological approach to tooth replacement in children and adolescents. Restoring or reshaping the transplanted tooth to the anterior maxilla should be done as soon as possible for psychological and aesthetic reasons. However, to avoid interfering with the natural healing process, reshaping of transplanted teeth is usually delayed three to four months after transplantation. This delay creates a need for simple indirect temporary aesthetic restoration for autotransplanted teeth. The aim of this study was to develop and validate a digital solution for temporary restoration of autotransplanted teeth using 3D printing. (2) Methods: Four dry human skulls and four dry human mandibles were scanned using cone beam computed tomography to create 3D models for 15 premolars. Digital impression of the maxillary arch of one of the skulls was captured by intra oral scanner. The digital work flow for the design and fabrication of temporary veneers is presented. The seating and adaptation of the 3D printed veneers were evaluated using stereomicroscopy and micro-computed tomography. (3) Results: Evaluation of the veneer seating using stereomicroscopy showed that the mean marginal gap at all of the sides was below the cut-off value of 200 µm. The overall mean marginal gap was 99.9 ± 50.7 µm (median: 87.8 (IQR 64.2⁻133 µm)). The internal adaptation evaluation using micro-computed tomography showed an average median gap thickness of 152.5 ± 47.7 (IQR 129⁻149.3 µm). (4) Conclusions: The present concept of using temporary veneers that are designed and fabricated with CAD/CAM (computer-aided design/computer-aided manufacturing) technology using a DLP (digital light processing) printer may present a viable treatment option for restoration of autotransplanted teeth.
(1) 背景：三维打印技术发展迅速，已应用于牙科多个领域。牙自体移植为儿童和青少年的牙齿替换提供了可行的生物学方法。出于心理和美学原因，应尽快对移植牙进行修复或重塑，使其恢复到上颌前牙区。然而，为避免干扰自然愈合过程，通常在移植后三到四个月对移植牙进行重塑。这种延迟导致需要对自体移植牙进行简单的间接临时美学修复。本研究旨在开发和验证一种使用 3D 打印技术对自体移植牙进行临时修复的数字解决方案。 (2) 方法：使用锥形束 CT 对四颗干燥的人颅骨和四颗干燥的人下颌骨进行扫描，为 15 颗前磨牙创建 3D 模型。通过口腔内扫描仪对其中一个颅骨的上颌弓进行数字化印模。介绍了设计和制作临时贴面的数字工作流程。使用体视显微镜和微计算机断层扫描评估 3D 打印贴面的就位和适应性。 (3) 结果：使用体视显微镜评估贴面的就位情况，显示所有边缘的平均边缘间隙均低于 200 µm 的截止值。总体平均边缘间隙为 99.9 ± 50.7 µm（中位数：87.8（IQR 64.2⁻133 µm））。使用微计算机断层扫描评估内部适应性，显示平均中位数间隙厚度为 152.5 ± 47.7（IQR 129⁻149.3 µm）。 (4) 结论：使用 CAD/CAM（计算机辅助设计/计算机辅助制造）技术设计和制作并使用 DLP（数字光处理）打印机制作临时贴面的概念可能为自体移植牙的修复提供可行的治疗选择。
