Finite Element Analysis of Zirconia Angled Ceramic Abutment.

Objective:To observe the influence of abutment angulation on the stress distribution within zirconia angled ceramic abutment and peri-implant bone.Methods: 14 three-dimensional finite element models of implant-supported maxillary incisor with angled abutments were established by COSMOS 2.85.Abutment was made by zirconia and titanium with an angle of 0 degree,5 degrees,10 degrees,15 degrees,20 degrees,25 degrees and 30 degrees co-related with the long axis of the implant,respectively.A load of 178 N and 130 degrees to the long axis of the implant was applied.Stresses within abutment and peri-implant bone were compared.Results: The stress distribution within zirconia and titanium angled abutment was different.Within zirconia abutment,stress concentrated in the shoulder and middle part of buccal side,while within titanium abutment only in the shoulder of buccal side.The maximum Von Mises stress within abutment and bone increased as the abutment angulation increased.The increasing speed was relatively stable within titanium abutment but obviously became faster within zirconia abutment when abutment angulaion was over 15 degrees.For the same abutment angulation,zirconia abutment demonstrated higher stress within abutment and lower stress within peri-implant bone.Conclusion: Stresses within zirconia angled ceramic abutment and peri-implant bone increased as the abutment angulation increased;over 15 degrees abutment angulation was not suggested for zirconia ceramic abutment.