背景:口内扫描的准确性对于牙科中的计算机辅助设计/计算机辅助制造工作流程至关重要。然而,缺乏有关各种相邻修复材料和口内扫描仪的扫描精度的数据。这项体外研究旨在评估相邻的修复材料类型和CEREC的口内扫描仪对嵌体腔的口内数字印模准确性的影响。
方法:准备假牙,咬合腔深度为2mm,牙龈底板的近端盒子宽度为1.5毫米,在舌侧和颊侧的过渡线角处,等牙龈边缘向外延伸,以进行镶嵌修复。相邻的牙齿用金和氧化锆制成的牙冠贴面,使用人造牙齿(树脂)作为对照组。镶嵌腔和相邻的牙齿(金,氧化锆,和树脂)使用椅子上的美学陶瓷经济修复(CEREC)Primescan(PS)扫描10次,Omnicam(OC),和Bluecam(BC)。使用实验室扫描仪(3形E3)获得参考扫描。根据制造商的说明进行扫描,包括BC组的粉末应用。使用三维分析软件程序分析标准镶嵌语言文件。使用双向方差分析和Tukey事后比较检验分析实验数据。
结果:相邻牙齿的修复材料显着影响了口内数字印模的准确性(p<.05)。氧化锆组显示出最高的精度偏差,其次是树脂和金组,每个都表现出统计学上的显著差异(p<.05)。树脂组显示出最高的最大正偏差和精度偏差。与其他相邻的修复材料相比,金的真实性平均偏差值最低。口内扫描仪类型显著影响扫描数据的真实性和精度(p<0.05)。根据口内扫描仪类型,正确度的平均偏差按以下顺序增加:BC>PS>OC。精度的平均偏差按以下顺序增加:PS>OC>BC(p<.05)。
结论:相邻牙齿的修复材料和口内扫描仪的类型会影响口内数字印模的准确性。BC组数字图像的真实性,通过喷洒粉末获得,与PS组相当。在相邻的修复材料中,氧化锆表现出最低的真实性。相比之下,PS在口腔内扫描仪中显示出最高的精度,而树脂在相邻的修复材料中显示出最低的精度。
BACKGROUND: The accuracy of intraoral scanning is critical for computer-aided design/computer-aided manufacturing workflows in dentistry. However, data regarding the scanning accuracy of various adjacent restorative materials and intraoral scanners are lacking. This in vitro study aimed to evaluate the effect of adjacent restorative material type and CEREC\'s intraoral scanners on the accuracy of intraoral digital impressions for inlay cavities.
METHODS: The artificial tooth was prepared with an occlusal cavity depth of 2 mm, a proximal box width at the gingival floor of 1.5 mm, and an equi-gingival margin extended disto-occlusally at the transition line angle on both the lingual and buccal sides for an inlay restoration. The adjacent teeth were veneered with crowns made of gold and zirconia, and an artificial tooth (resin) was utilized as the control group. The inlay cavity and adjacent teeth (Gold, Zirconia, and resin) were scanned 10 times using Chairside Economical Restoration of Esthetic Ceramics (CEREC) Primescan (PS), Omnicam (OC), and Bluecam (BC). A reference scan was obtained using a laboratory scanner (3-shape E3). Scanning was performed according to the manufacturer\'s instructions, including powder application for the BC group. Standard tesselation language files were analyzed using a three-dimensional analysis software program. Experimental data were analyzed using a two-way analysis of variance and the Tukey\'s post-hoc comparison test.
RESULTS: The restorative materials of the adjacent teeth significantly affected the accuracy of the intraoral digital impressions (p < .05). The zirconia group exhibited the highest trueness deviation, followed by the resin and gold groups, with each demonstrating a statistically significant difference (p < .05). The resin group demonstrated the highest maximum positive deviation and deviation in
precision. Gold exhibited the lowest average deviation value for trueness compared with those of the other adjacent restorative materials. Intraoral scanner type significantly influenced the trueness and
precision of the scan data (p < .05). The average deviation of trueness according to the intraoral scanner type increased in the following order: BC > PS > OC. The average deviation in
precision increased in the following order: PS>OC>BC (p < .05).
CONCLUSIONS: The restorative materials of the adjacent tooth and the type of intraoral scanner affect the accuracy of the intraoral digital impression. The trueness of the digital images of the BC group, obtained by spraying the powder, was comparable to that of the PS group. Among the adjacent restorative materials, zirconia exhibited the lowest trueness. In contrast, PS demonstrated the highest
precision among the intraoral scanners, while resin displayed the lowest
precision among the adjacent restorative materials.