北京大学学报（医学版）2018，Vol.50Issue(1)：136-140,5.DOI:10.3969/j.issn.1671-167X.2018.01.023
比较口内扫描和模型扫描对数字化牙列模型咬合定量分析的影响
Influence of intraoral scan and dental cast scan on occlusal quantitative analysis of virtual dental model
摘要
Abstract
Objective: To make more accurate occlusal quantitative analysis of three-dimensional (3D) virtual dental models and to compare the occlusal contact obtained by intraoral and dental cast scan. Methods: In this study, 5 subjects were intraoral scanned using laser scanner (3 shapes, Germany) to obtain the 3D virtual models of one tooth (the first molar), two teeth (the second premolar and the first molar),three teeth (the premolars and the first molar) and their opposite teeth, respectively. The silicone impressions were made and dental stone models were poured for each of them. The dental casts were scanned and then they were fixed to the maximum intercuspal position with a special locating jig for a rescanning of occlusal position. The virtual models taken intraorally and obtained with dental cast scan were introduced to a 3D quantitative analysis system, and some criteria regarding to occlusal contact were cal-culated and analyzed. The occlusal criteria were mean values of occlusal clearance space between the upper and lower occlusal surface (clearance),occlusal contact area (area),and cusp inclination (angle) of the mandibular first molar. Paired t tests were used to evaluate differences of occlusal criteria between the virtual models obtained with the intraoral scan and dental cast scan (a =0.05). Results: The mean values of occlusal clearance of one to three teeth obtained by way of intraoral scan were smaller than those obtained by way of cast scan by 0. 134 mm, 0. 177 mm, and 0. 207 mm,respectively. While the occlusal contact areas were greater than the cast scan by 8. 65 mm2,10. 28 mm2,and 11.46 mm2. No statistically significant differences were found between the cusps inclinations obtained with the two scanning methods,and the interclass correlations were high. Conclusion: Occlusal clearance obtained by intraoral scan was less than that by cast scan while the occlusal contact area was greater than the latter, indicating that intraoral occlusal contact was closer. The difference of the standard deviations of occlusal clearance measured by the two methods were small and that of occlusal contact area was influenced by the number of teeth scanned intraorally. There was no statistical difference in cusp inclination between the two methods.关键词
成像,三维/激光/牙(牙合)/图像处理,计算机辅助/牙科印模技术Key words
Imaging,three-dimensional/Lasers/Dental occlusion/Image processing, computer-assisted/Dental impression technique分类
医药卫生引用本文复制引用
程明轩,姜婷,孙玉春,张皓羽..比较口内扫描和模型扫描对数字化牙列模型咬合定量分析的影响[J].北京大学学报（医学版）,2018,50(1):136-140,5.基金项目
北京市科技计划课题首都特色临床应用及普及项目（Z171100001017096)和北京大学口腔医院临床新技术新疗法项目(PKUSSNCT-16A01)资助 （PKUSSNCT-16A01）
Supported by the Capital Characteristic Clinical Application Research Project (Z171100001017096) and the Program of New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology (PKUSSNCT-16A01) （Z171100001017096）
