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《Journal of Clinical Stomatology》 2011-12
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The influence of cusp inclination on the stress of implant supported all-ceramic single crown

GE Chun-cheng,TIAN Tao.Department of Stomatology,Enshi Central Hospital,Hubei Enshi 445000,China.  
Objective:To analyze the influence of cusp inclination on the stress of implant supported all-ceramic single crown.Materials and Method:5 three-dimensional finite element models of implant supported all-ceramic crown for the first mandibular molar with different cusp inclination were established by COSMOS 2.85.The inclination of buccal cusp was 20,25,30,35 and 40 degrees respectively.Vertical and horizontal loading was applied to analyze the influence of cusp inclination on the stress within all-ceramic crown,abutment,implant and surrounding bone.Result:Within all-ceramic crown,the tensile and Von Mises stress concentrated at the buccal cervical marginal area,the compress stress concentrated at the loading position.The maximum tensile stress was increased as the cusp inclination increased under vertical loading,but decreased under horizontal loading.The maximum compress stress and Von Mises stress was lowest when the cusp inclination was 25 degrees.Within abutment and fixture,the stress concentrated at cervical part on buccal side.For surrounding bone,the stress concentrated at the cervical part on the buccal side under vertical loading and both buccal and lingual side under horizontal loading.Maximum stresses within the abutment,fixture and surrounding bone had no significant difference under vertical loading but increased as the cusp inclination increased under horizontal loading.Conclusion:The stress distribution of implant supported all-ceramic single crown was similar with different cusp inclinations.Maximum stresses were significantly influenced by the loading condition.
【CateGory Index】: R783.3
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