Nemli S K, Wolfart S, Reich S
Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Int J Comput Dent. 2012;15(1):23-31.
The aim of this in-vitro study was to evaluate the accuracy of inLab and Cerec Connect software in simulating the maximum intercuspal contacts in comparison to the real situation on the respective gypsum casts.
Ten pairs of maxillary and mandibular casts were mounted in articulators in maximum intercuspal position. The contacts of the gypsum casts were marked and digital photographs of the mandibular casts were taken. Digital impressions of arches were made using two different software packages; inLab (Version 3.83) and Cerec Connect (Version 3.83) using the Cerec Acquisition Center. The intercuspal position of the teeth was captured by buccal images. Screenshots of the virtual casts showing the occlusal contacts were saved. The digital photographs of the contacts of the cast and the screenshots of the occlusal contacts were superimposed using an image processing program. The number of contacts of the virtual mandibular models that were identical with the contacts of the gypsum casts were determined and calculated as percentages in relation to the gypsum cast contacts, which were set as 100%. The null hypothesis tested was that the Cerec connect software delivers contacts that are closer to the real situation than contacts created with the inLab software.
Cerec Connect showed a median percentage of 41.6% and Inlab a median percentage of 31.9%. The Wilcoxon test revealed statistically significant differences between the inLab software and Cerec Connect. Especially at the contra-lateral side of that side where the virtual buccal registration was done, the contacts showed the greatest deviations from the original.
Cerec Connect more precisely virtually simulated the real contacts than did inLab when scanning full-arch dentitions.
本体外研究旨在评估inLab和Cerec Connect软件在模拟最大牙尖交错接触方面的准确性，并与各自石膏模型上的实际情况进行比较。
将十对上颌和下颌模型安装在牙合架上，处于最大牙尖交错位。标记石膏模型的接触点，并拍摄下颌模型的数码照片。使用两个不同的软件包（inLab 3.83版本和Cerec Connect 3.83版本）通过Cerec采集中心对牙弓进行数字化印模。通过颊侧图像获取牙齿的牙尖交错位。保存显示咬合接触的虚拟模型截图。使用图像处理程序将模型接触点的数码照片与咬合接触的截图进行叠加。确定与石膏模型接触点相同的虚拟下颌模型接触点数量，并计算其相对于设定为100%的石膏模型接触点的百分比。所检验的零假设是，Cerec connect软件生成的接触点比inLab软件生成的接触点更接近实际情况。
Cerec Connect显示的中位数百分比为41.6%，Inlab为31.9%。Wilcoxon检验显示inLab软件和Cerec Connect之间存在统计学显著差异。特别是在进行虚拟颊侧记录的那一侧的对侧，接触点与原始情况的偏差最大。
在扫描全牙列时，Cerec Connect比inLab更精确地虚拟模拟了实际接触情况。
