Department of Prosthodontics and Implantology, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.
J Indian Prosthodont Soc. 2023 Oct-Dec;23(4):391-397. doi: 10.4103/jips.jips_273_23.
This study investigates the effectiveness of an innovative virtual tooth preparation workflow for the fabrication of dental crowns using cone-beam computed tomography (CBCT) and intraoral scanners (IOSs) with conventional workflow using extraoral/laboratory scanners.
This in vitro experimental study was conducted in the laboratory of a university in Chennai, India. The dental laboratory and research facilities at the institution were utilized for the fabrication of the temporary crowns and the data acquisition process.
Institutional approval was obtained from the university. It was basically a comparison between the virtual prep technique using CBCT and IOS and the conventional digital technique using extra oral scanners (EOS) for temporary crown fabrication. The sample size was estimated using an effect size of 1.5004, assuming a normal distribution, a significance level of 0.05, and a power of 0.95 in G power software. Based on this calculation, an extracted second lower molar was used to fabricate 10 samples in each group. The samples were divided into three groups: the CBCT (Group 1), the IOS (Group 2), and laboratory scanner (Group 3 as control) groups. The vertical marginal gap of all the surfaces of the crown was evaluated using a scanning electron microscope.
Data were analyzed using one-way ANOVA using the SPSS software version 26.0, IBM, Armonk, NY, USA.
Acceptable marginal discrepancy values were obtained in all three groups. There was no significant difference in the marginal discrepancy recorded (P = 0.113).
Virtual tooth preparation using CBCT and IOSs can be used as an alternative to the conventional workflow for provisional crown and bridge fabrication.
本研究旨在比较使用锥形束计算机断层扫描（CBCT）和口内扫描仪（IOS）的创新虚拟牙体预备工作流程与使用传统口外/实验室扫描仪的常规工作流程在制作牙冠方面的效果。
这是一项在印度钦奈的一所大学的实验室中进行的体外实验研究。该机构的牙科实验室和研究设施用于制作临时冠和数据采集过程。
获得了该大学的机构批准。这基本上是使用 CBCT 和 IOS 的虚拟预备技术与使用口外扫描仪（EOS）的传统数字技术在临时冠制作方面的比较。使用 G 力量软件，根据效应大小 1.5004、正态分布、显著性水平 0.05 和功率 0.95 来估计样本量。根据此计算，使用一个第二下磨牙进行了样本提取，每组制作 10 个样本。将样本分为三组：CBCT（第 1 组）、IOS（第 2 组）和实验室扫描仪（第 3 组作为对照）组。使用扫描电子显微镜评估所有牙冠表面的垂直边缘间隙。
使用 SPSS 软件版本 26.0，IBM，Armonk，NY，USA 中的单向方差分析对数据进行分析。
三组中均获得了可接受的边缘差异值。记录的边缘差异无显著差异（P=0.113）。
使用 CBCT 和 IOS 的虚拟牙齿预备可以替代传统的临时冠和桥制作工作流程。
