不同隙料厚度对全瓷冠适合性的影响  

Effect of different luting spaces on marginal fit of all-ceramic crowns

作　　者：申丹凤[1] 王小林[2] 王璐[1] 吴恙[1] 徐凌[1] 

机构地区：[1]重庆医科大学附属口腔医院修复科,重庆市口腔疾病与生物医学研究中心,重庆401147 [2]重庆医科大学附属第一医院体检中心,重庆400016

出　　处：《第三军医大学学报》2012年第20期2090-2093,共4页Journal of Third Military Medical University

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.

关 键 词：计算机辅助设计与制作 隙料厚度 全瓷冠 适合性 

分 类 号：R783.1[医药卫生—口腔医学] R783.2[医药卫生—临床医学]