Assistant Lecturer of Prosthodontics, Faculty of Dentistry, Damanhour University, Damanhour, Egypt; and PhD student, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Professor and Chairman, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
J Prosthet Dent. 2023 May;129(5):777.e1-777.e7. doi: 10.1016/j.prosdent.2023.03.010. Epub 2023 Apr 5.
The accuracy of different virtual cement gap parameters in designing a single crown in a computer-aided design (CAD) software program is still unclear.
The purpose of this in vitro study was to evaluate and compare the virtual cement gap settings of 3 different CAD software programs used to design a single crown restoration.
Three different CAD software programs (exocad, Dental System, and B4D) were evaluated for designing single crowns with similar virtual cement gap settings. Three experimental groups were created based on the CAD software program used (n=10). Three-dimensional analysis software program was used to assess the virtual cement gap in the CAD restoration. The Shapiro-Wilk test of normality was used. Comparisons were carried out by using 1-way ANOVA and the Scheffé post hoc test (α=.05).
The Dental System software program had the lowest statistical mean error values at both tooth margin (4.6 μm) and axial wall (1.5 μm), followed by B4D then exocad. At the occlusal surface, the lowest statistical mean error value of 5 μm was achieved by the Dental System followed by exocad then B4D.
Accuracy of the virtual cement gap parameter in single crown design varies based on the CAD software used. The highest accuracy was attained by the Dental System software program at all tooth surfaces, followed by B4D at the tooth margin and axial wall and by exocad at the occlusal surface.
不同虚拟固位间隙参数在计算机辅助设计（CAD）软件程序中设计单冠的准确性仍不清楚。
本体外研究的目的是评估和比较用于设计单冠修复体的 3 种不同 CAD 软件程序的虚拟固位间隙设置。
使用 3 种不同的 CAD 软件程序（exocad、Dental System 和 B4D）设计具有相似虚拟固位间隙设置的单冠。根据使用的 CAD 软件程序（n=10）创建了 3 个实验组。使用三维分析软件程序评估 CAD 修复体中的虚拟固位间隙。使用 Shapiro-Wilk 检验进行正态性检验。采用单因素方差分析和 Scheffé 事后检验（α=.05）进行比较。
在牙颈缘（4.6μm）和轴向壁（1.5μm）处，Dental System 软件程序的统计均方误差值最低，其次是 B4D，然后是 exocad。在牙合面，Dental System 软件程序的最低统计均方误差值为 5μm，其次是 exocad，然后是 B4D。
基于使用的 CAD 软件，单冠设计中虚拟固位间隙参数的准确性有所不同。在所有牙面，Dental System 软件程序的准确性最高，其次是 B4D 在牙颈缘和轴向壁，exocad 在牙合面。
