Analysis Of Different Position Of Implant’s Stress Distribution In Whole Maxillary Dentition Implant-Supported Fixed Bridge With Three-dimensional Finite Element Method

Objective:Through the establishment of a3D finite element model of a dental implant fixed bridge restoration of edentulous maxillary and analysis of the stress distribution of implant in different position, we propose to provide a reference for clinical applications.Methods:In this research, we selected the volunteer of complete dentition and moderate alveolar bone absorption, and then scanned his head with spiral CT. This research used a series of computer software for data conversion in order to complete the reconstruction of three-dimensional solid model of the maxillary. Based on this, we built a three-dimensional finite element model of implant-supported simulate different location and different cantilever length of a fixed bridge, and observed after the repair of computer simulation of stress distribution. This artical designed the different length of the cantilever on the basis of the experimental model I, and selected the stress values of two implants in the maxillary lateral incisor and the first premolar in different parts as observation index, to analyze the stress distribution changes around the implant bone interface.Under the same load when the vertical,we built two sets of model on the basis of experiment1. By changing the location of the implant and the length of the cantilever, and also choose the maximum stress under different circumstances around the implant-bone interface as observation index.Then we used finite element analysis software to analyze its variations.Results:We Successfully established the three-dimensional finite element model, which had a good geometric similarity, and simplified it reasonably with maintaining the similar mechanics of the original model. The implant neck bone interface stress value of the distal of the implant fixed bridge near the cantilevered was maximum, which was the stress concentration area. When the cantilever length was the same, the implants neck stress in two implants of model Ⅱ was greater than model I. The obvious stress change was found in the mesial part of the implant. When the way of loading was the same, the area between the two implants had a more obvious stress concentration in model Ⅱ.When under the same load situation, the changes of implant positions and the different cantilever length were significant to the stress distribution.Conclusion:1the length of the cantilever affects the implant’s stress distribution. We should shorten the length of the cantilever appropriately when we use the whole maxillary dentition implant-supported fixed bridge.2The position of the implant also affects the stress distribution.When we use the whole maxillary dentition implant-supported fixed bridge,the position of the implant should be dispersed and should be in a curved type distribution in the dental arch.