Three-dimensional Finite Element Analysis Of Implant Prostheses With Labial Bone Graft

Objective: To investigate and analyze the influence of bone graft factors on the implant-bone interface,implant,abutment,retaining screw and internal stress distribution in three occlusal relationships.Methods: With reference to the technical parameter documents of the product,the obtained imaging data and the actual measured data,a model of implant prosthesis of maxillary central incisor supported by two kinds of labial bone was established by using the software of Mimics17.0.Three kinds of occlusal conditions were simulated to analyze the stress distribution at the implant bone interface,implant,abutment,retaining screw and the internal of the prosthesis under the influence of two kinds of labial bone conditions and three kinds of loading methods.Results: When the occlusal relationship changed from the edge-to-edge occlusion to the normal and deep overbite relationship,the stress at the occlusal site of the prosthesis increased correspondingly,and the stress at the abutment,implant and the implant bone interface decreased.Under the normal occlusal relationship,the stress at the retention screw was more concentrated than the other two occlusion relationships.The stress in retaining screw and the labial bone tissues of the implant were much lower than those in non-bone graft group,but the stress of the implant neck was higher in bone graft group than that in non-bone graft group.Conclusion: This study shows that the changes of occlusal relationship and labial bone affect the stress distribution in various structures of implant prosthesis and implant bone interface,which can indicate the long-term risk brought by different occlusal methods and different labial bone.It can provide theoretical reference for eliminating related risk factors to improve the long-term success of implant and reduce the occurrence of related mechanical complications.