Lee Kyungmin, Lee Gyu-Hyoung
Department of Orthodontics, School of Dentistry, Chonnam National University, 33 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea.
Int J Implant Dent. 2020 Sep 30;6(1):55. doi: 10.1186/s40729-020-00253-3.
Radiographs are integral in evaluating implant space and inter-root distance. The purpose of this report is to introduce a method for evaluating the 3D root position with minimal radiation using a 3D tooth model composed of an intraoral-scanned crown and a cone-beam computed tomography (CBCT)-scanned root.
Intraoral scan and CBCT scan of the patient were obtained before treatment. In the CBCT image, tooth segmentation was performed by isolating individual teeth from the maxillary and mandibular alveolar bone using software program. The 3D tooth model was fabricated by combining segmented individual teeth with the intraoral scan.
A post-treatment intraoral scan was integrated into the tooth model, and the resulting position of the root could be predicted without additional radiographs. It is possible to monitor the root position after a pretreatment CBCT scan using a 3D tooth model without additional radiographs.
The application of the 3D tooth model benefits the patient by reducing repeated radiation exposure while providing the clinician with a precise treatment evaluation to monitor tooth movement.
X线片在评估种植体空间和牙根间距方面不可或缺。本报告的目的是介绍一种使用由口内扫描的牙冠和锥形束计算机断层扫描（CBCT）扫描的牙根组成的三维牙齿模型，以最小辐射量评估三维牙根位置的方法。
在治疗前获取患者的口内扫描和CBCT扫描。在CBCT图像中，使用软件程序将单个牙齿与上颌和下颌牙槽骨分离，进行牙齿分割。通过将分割后的单个牙齿与口内扫描相结合，制作三维牙齿模型。
将治疗后的口内扫描整合到牙齿模型中，无需额外的X线片即可预测牙根的最终位置。使用三维牙齿模型，在治疗前CBCT扫描后无需额外的X线片即可监测牙根位置。
三维牙齿模型的应用通过减少重复辐射暴露使患者受益，同时为临床医生提供精确的治疗评估以监测牙齿移动。
