摘要
目的研究InLab MC XL系统不同隙料厚度对Cerec Blocs全瓷冠边缘和内部适合性的影响。方法制备右上颌第一磨牙全冠预备体模型并翻制硅橡胶阴模,分别灌制全瓷石膏、超硬石膏预备体模型各30个。30个全瓷石膏预备体用于光学印模采集,获得30个数字化代型并完全随机分为6组分别设置不同隙料厚度值:0(A组)、10(B组)、20(C组)、30(D组)、40μm(E组)和50μm(F组),每组5个。30个超硬石膏预备体用于全瓷冠黏结,经包埋、剖开后,体式显微镜扫描试件剖面。结果 C、D组边缘适合性均介于30～120μm,内部适合性均介于30～300μm。C组与D组冠边缘适合性比较有统计学差异(P<0.05)。C、D组冠内部适合性不均匀,面适合性相对较大。结论当隙料厚度为20、30μm时,全瓷冠的边缘和内部适合性均在临床可接受范围内;30μm的冠边缘适合性优于20μm,但20、30μm的冠面适合性较差。
Objective To determine the effect of different luting spaces on marginal and internal fit of Cerec Blocs all-ceramic crowns in InLab MC XL system.Methods A right maxillary first molar in the standard model was prepared and subsequently replicated into silicone rubber negative mold.Respectively,30 preparations of all-ceramic plaster and die stone were irrigated.Thirty all-ceramic plasters were used for optical impression,and then 30 three-dimensional digital images were obtained and randomly and equally divided into 6 groups,with their luting spaces were set to 0（group A）,10（group B）,20（group C）,30（group D）,40（group E） and 50 μm（group F） respectively by computer software.In addition,30 die stones were prepared for bonding of the all-ceramic crowns.After being bonded,embedded and slitted,these specimens were scanned by stereo microscopy.Results The marginal fit was ranging from 30 to 120 μm and the internal one from 30 to 300 μm in groups C and D.There were statistically significant differences between groups C and D in the marginal fit（P〈0.05）.The fit of occlusal surface was better than other parts of the internal fit in groups C and D.Conclusion All-ceramic crowns can obtain the marginal and internal fit which meets clinical requirements when luting spaces are 20 and 30 μm.The crowns with luting spaces of 30 μm is better than that with 20 μm in the marginal fit,but both are worse in the fit of occlusal surface than other parts of internal fit.
出处
《第三军医大学学报》
CAS
CSCD
北大核心
2012年第20期2090-2093,共4页
Journal of Third Military Medical University
关键词
计算机辅助设计与制作
隙料厚度
全瓷冠
适合性
computer aided design and manufacture
luting space
all-ceramic crown
fit
