摘要
目的研究Cerec3D/Inlab MC XL系统不同光学印模法对Cerec Blocs全瓷冠边缘和内部适合性的影响。方法制备1个右侧下颌第一磨牙全冠预备体模型,复制32个石膏代型。采用随机抽样法,16个代型用于冠粘接,16个代型用于光学印模采集,其中直接法和间接法各选取8个,分别制作8个Cerec Blocs全瓷冠。采用修正美国公共卫生服务(USPHS)标准和扫描电镜(SEM)法评价冠的适合性,SAS9.1软件对实验数据进行统计分析。结果修正USPHS法显示87.5%的边缘测试点临床可接受,直接法与间接法边缘适合性比较差异无统计学意义(P>0.05);SEM法显示所有冠的边缘测试点均小于120μm,直接法与间接法边缘和内部适合性比较差异均无统计学意义(P>0.05),但直接法在近中、颊面、舌面、面的适合性优于间接法(P<0.05);直接法远中轴面适合性较差,与近中轴面比较差异有统计学意义(P<0.01)。结论光学印模法对Cerec Blocs冠边缘适合性无影响,但对内部适合性有一定影响,全瓷冠边缘适合性均在临床可接受范围内。
Objective To study the effect of different optical impression methods in Cerec 3D/Inlab MC XL system on marginal and internal fit of all-ceramic crowns.Methods A right mandibular first molar in the standard model was used to prepare full crown and replicated into thirty-two plaster casts.Sixteen of them were selected randomly for bonding crown and the others were used for taking optical impression,in half of which the direct optical impression taking method were used and the others were used for the indirect method,and then eight Cerec Blocs all-ceramic crowns were manufactured respectively.The fit of all-ceramic crowns were evaluated by modified United States Public Health Service（USPHS） criteria and scanning electron microscope（SEM） imaging,and the data were statistically analyzed with SAS 9.1 software.Results The clinically acceptable rate for all marginal measurement sites was 87.5% according to USPHS criteria.There was no statistically significant difference in marginal fit between direct and indirect method group（P0.05）.With SEM imaging,all marginal measurement sites were less than 120 μm and no statistically significant difference was found between direct and indirect method group in terms of marginal or internal fit（P 0.05）.But the direct method group showed better fit than indirect method group in terms of mesial surface,lingual surface,buccal surface and occlusal surface（P0.05）.The distal surface＇ s fit was worse and the obvious difference was observed between mesial surface and distal surface in direct method group（P0.01）.Conclusion Under the conditions of this study,the optical impression method had no significant effect on marginal fit of Cerec Blocs crowns,but it had certain effect on internal fit.Overall all-ceramic crowns appeared to have clinically acceptable marginal fit.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2010年第1期29-33,共5页
West China Journal of Stomatology
关键词
适合性
光学印模
计算机辅助设计与制作
全瓷冠
fit
optical impression
computer aided design/computer aided manufacture
all-ceramic crown
