Influence Of Tilting Implantation On Biomechanical Distribution On Implant-bone Interface: A Three-Dimensional Finite Element Analysis

Objective: Three-dimensional mathematical models of the mandible with temporomandibular joint was developed that was used to analyze the influence of different tilted angle on the distribution of the stress, strain and displacement on the implant-bone interface. Materials and Methods: CT scan and image processing were applied to construct a three-dimensional mathematical models of edentulous mandible . A 4. OmmXlOmm cylindrical implant was embedded in the first molar position, which was vertical and 10?^ 20?> 30?tilted lingually to occlusal plane respectively, to perform four three-dimensional finite element models with dental implants. A simulated force of masticatory muscles was loaded in the mathematical models, analysis of the stress, strain and displacement distribution on the implant-bone interface at central occlusion. Results: The stress concentration appeared around the neck of implants intergrated with the cortical bone, on the contrary , a little stress was found around the middle portion of implants intergrated with the cancellous bone. There was an increase in the magntitude of stress, strain and displacement as the angle increased, the stress concentration area transferred from the neck to the bottom around implants. When the embeded implant was angled 30? the stress ofimplant-bone interface increased significently(P<0.05), the magntitude of strain and displacement also increased obviously. Conclusions: The study revealed that the tilted angle of implants should be less than 30? or it would cause bone microfracture and absorption easily and reduce the rate of long-term success of dental implantation.