A Dynamic Finite Element Analysis Of Stress Distribution In Bone Tissue Surrounding Solely Or Splinted Implant-borne Fixed Partial Denture

ObjectiveThis study uses the finite dement method(FEM) to simulate stresses induced in bone tissue surrounding solely and splinted implants in the mandible under dynamic loads,so as to provide theoretical references of biomechanics for clinical application of implant-borne fixed partial dentures.MethodsThree-dimensional finite-element models were created of a(?) section of the mandible with solely and splinted implants embedded in.Vertical and oblique dynamic loads were applied in a circle of mastication(0.875s).The stress distribution was analyzed to study the biomechanical behavior of bone tissue surrounding solely and splinted implants.Result1 The three-dimensional finite element model was good in geometry,which could serve for the needs of the three-dimensional stress analysis.2 In a simulated circle of mastication,under the different loads,the stress of the implant-bone interface was concentrated in the cervical of the bone.The interface stress of the solely implants spreaded to the cancellous bone better,while there were low stress regions of the interface of the splinted implants.3 As loading on the solely implant(?),the maximum Von Mises value under oblique loads at t=0.30s was 4 times that under vertical loads at t=0.15s.Meanwhile,as coincidently loading on the splinted implants,the maximum Von Mises value at t=0.30s was 1.2 times that at t=0.15s.4 As loading on the solely implant(?),the maximum stress value was 48.393 MPa at t=0.30s. As separately loading on the splinted implant the(?),the maximum stress value of the whole model was 9.541 MPa in the same load course,which was located at the distal cervical of the indirectly loaded implant(?).5 By comparing the stress distribution under different kinds of loads,the stress of the distal implant was more than that of the mesial implant.Conclusions1 CT scanning aided finite element model building,used with Pro/Engineer software and ANSYS software,is a convenient and credible method.2 There are stress concentration regions and low stress regions at the bone interface.3 Oblique loads tend to produce more stress concentration than vertical loads.4 Partial loads of the directly loaded implant is transferring to the indirectly loaded implant through the pontic.Thus,stress in the bone-interface of the splinted implants is even distributed in the cervical.5 The distal implant tends to undertake more loads than the mesial one.