LIN Bin,LU Cheng-lin,ZHANG Xiu-yin,ZHANG Dong-sheng.Effects of adhesive thickness on internal stress distribution in full-ceramic crowns[J].Journal of medical biomechanics,2010,25(1):56-62
粘接剂厚度对IPS Empress II 全瓷冠应力的影响分析
Effects of adhesive thickness on internal stress distribution in full-ceramic crowns
Chinese key words:  全瓷冠;粘接剂;厚度  应力;有限元
English Key words:Full-ceramic crown  Adhesive  thickness  Stress  Finite element analysis
Fund project:国家自然科学基金项目(30672348,10772111),上海市重点学科建设项目(S30106)
Author NameAffiliation
LIN Bin Shanghai institute of Applied Mathematics and Mechanics 
LU Cheng-lin Shanghai institute of Applied Mathematics and Mechanics 
ZHANG Xiu-yin Department of Stomatology, Shanghai Ninth people's Hospital Affiliated to Shanghai Jiaotong University,School of Medicine 
ZHANG Dong-sheng Department of Mechanics, aShanghai University 
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Chinese abstract:
      目的 本研究利用数值分析方法研究3M ESPE RelyX ARC粘接剂厚度对IPS Empress II全瓷冠各组成部分应力水平的影响。方法 建立粘接剂厚度分别为60、90、120和150μm的四种全瓷冠数值模型,施加四种不同的载荷加载方式,用数值计算方法分析全瓷冠的各组成部分的应力极值和应力分布进行分析。结果 当粘接剂的厚度从60μm增大到90μm时,全瓷冠饰面瓷和核瓷的张应力极值都有所降低;而当厚度增至120μm时,瓷冠的应力水平有所提高,当厚度继续增大为150μm时,饰面瓷和核瓷的应力极值显著增大。结论 粘接剂内部的正应力在粘接剂厚度为90-120μm时维持在一个较低的水平。当粘接剂厚度达到90μm以上时,剪应力幅值变化不大。当粘接剂厚度维持在90μm附近时,可以降低各瓷层内部的应力水平。粘接剂主要以剪切的方式破坏,粘接剂剪切强度是一个值得注意的问题。
English abstract:
      Objective The objective of this study is to investigate the effects of the thickness of the adhesives (3M ESPE RelyX ARC) on the internal stress distribution of the IPS Empress II full-ceramic crowns using Finite Element Analysis (FEA). Methods A dummy Empress II ceramic crown restoration of the mandible right first molar was prepared according to standard dental process. Followed by micro-CT scanning, four 3D numerical models with cement thickness 60, 90, 120 and 150μm were established. The models were subjected to four loading conditions and stresses in veneer and core layers were presented. Results Numerical results indicate that when adhesive thickness increases from 60μm to 90μm, the maximum principal stress either in veneer or core decreases. However, when thickness increases to 150μm, stress variation trends differ from adhesives. Conclusion The normal stresses in adhesives remain a low level when the thickness varies from 90μm to 120μm, while the shear stress is less sensitive to the thickness when it exceeds 90μm. There is an optimal thickness which can reduce the tensile stress in the core and veneer. Attention should be paid to the shear strength of the adhesives since the shear stress could cause failure in the adhesive layer.
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