Stress Analysis of Implant-supported All-ceramic Single Crown on Different Abutments

Objective:The purpose of this study was to observe stress distribution and maximum stresses of implant-supported all-ceramic single crown on alumina,zirconia,and titanium abutments.Methods:Three dimensional finite element model of implant-supported all-ceramic crown for mandibular first premolar was founded.Alumina,zirconia and titanium were used as abutment materials,respectively.600 N vertical load and 225 N horizontal load were applied on the occlusal surface.The stress distribution and maximum stress within all-ceramic crown,abutment,fixture,and bone on different abutment were analyzed.Results:The stress distribution on ceramic abutments was similar to that on titanium abutment.The maximum stresses under horizontal loading were higher than those under vertical loading.The stresses within all-ceramic crown concentrated at the loading position and lingual shoulder.The maximum stresses within all-ceramic crown on ceramic abutments had no significant difference and were lower than those on titanium abutment.Within abutment,the stresses concentrated at cervical part on buccal side.The maximum stresses within titanium abutment were lower than those within all-ceramic abutments while the displacement of titanium abutment was higher.For fixture and bone,the stresses concentrated at cervical cortical bone.The Von Mises stresses of fixture and bone on titanium abutment were higher than those on ceramic abutment under horizontal loading.Conclusion:The stresses within all-ceramic crown,implant,and bone on ceramic abutments were lower than those on titanium abutment.The stresses within zirconia and alumina abutment had no significant difference and were higher than those within titanium abutment.