摘要
目的研究粘接剂排溢沟对后牙全冠适合性的影响。方法三维建模一颗下颌第一磨牙,在Rhinoceros 5.0软件中设计4种预备体模型:A为常规全冠预备设计,B、C、D分别在A组的基础上设计1、2、4个粘接剂排溢沟,3D打印树脂预备体各5个。根据A预备体设计全冠,CAD/CAM制作氧化锆全冠20个,完全随机分为4组。三维扫描仪扫描试件,进行偏差分析及壁厚分析。硅橡胶法复制冠与预备体之间的间隙,金相显微镜下观察,并测量间隙大小。SPSS 17.0软件进行统计分析。结果全冠边缘和内部间隙从大到小依次为A组、B组、C组、D组,两两比较差异有统计学意义(P<0.05)。结论粘接剂排溢沟能显著提高全冠的适合性,且排溢沟数量越多,全冠适合性越好。
Objective To study the effect of adhesive overflow grooves on the marginal and internal adaptation of a molar zirconia full crown. Methods A three-dimensional model of a mandibular first molar was established. Four crown preparations （A-D） were designed ： a was a conventional full crown design, and B, C, and D included 1,2, and d adhesive overflow grooves, respectively, designed on the basis of A. Five resin preparations were created for each group using three-dimensional （3D） printing. According to the a design data, 20 CAD/ CAM zirconia crowns were prepared and randomly divided into four groups. The tooth, preparations, and crowns underwent 3D scanning for 3D deviation analysis and 3D wall thickness analysis. The gap between the crown and the preparation was replicated with silicone rub- ber, and then observed with a metallographic microscope and measured. Data were statistically analyzed with SPSS 17.0. Results Among the groups ,marginal and internal clearance was A〉B〉C〉D. The comparison between every two groups was statistically different （P 〈 0.05）. Conclusion Increases in the number of overflow grooves result in significant increases in the marginal adaptation and internal adaptation of a full crown.
出处
《中国医科大学学报》
CAS
CSCD
北大核心
2017年第10期882-886,共5页
Journal of China Medical University
基金
辽宁省自然科学基金(2013022012)
关键词
粘接剂排溢沟
边缘适合性
内部适合性
adhesive overflow groove
marginal adaptation
internal adaptation
