A3-d Fem Study On The Stress Distribution And Displacement Of Zygomatic Temporal Suture Assessed With Implanting Retractive Forces To Maxilla Of Rhesus Monkey

[Objective] To construct the3-D finite elemet model which contains zygomatic temporal suture of craniofacial complex on the base of the established model to optimize the original model. Different mechanical properties of sutures were applied. Under the same loading condition. Bone displacements and stress distribution of the maxilla were calculated to investigate the biomechanics characters preliminarily of suture with retractive forces. This study has provided the scientific basis for the mechanism research of cranial and set up good foundation for biomechanical studies of craniofacial complex.[Materials and Methods]1. The establishment of3-D finite elemet model which contains zygomatic temporal suture of craniofacial complex:(1) Make sure the coordinates in Mimics and Ansys software are the same.A wooden model which contain a cavitie was used, then CT images which from scaned spiral CT was outputed in DICOM format from CT workstation to a personal computer, the3-D finite elemet model of wooden model was established using Mimics and Ansys software. The coordinates of the point in Mimics and Ansys software were recorded respectively, then we can make sure the coordinates in Mimics and Ansys software are the same.(2) Record the coordinates of the suture:First marked the points of suture accurately in Mimics software and recorded the coordinates.Then found the same points using the established model in ANSYS software. The3-D finite elemet model which contains zygomatic temporal suture of craniofacial complex were established with ANSYS software.2.3-D finite element analysis of the biomechanics mechanism of the suture with implants anchorage retractive forces:Sutures were assigned isotropic material properties that varied between modeling experiments. Four different sets of mechanical properties were used:1MPa,50MPa,1.37Gpa,13.7Gpa to investigate the biomechanics characters preliminarily of zygomatic temporal suture with implants anchorage retractive forces.[Result]l.The establishment of3-D finite elemet model which contains zygomatic temporal suture of craniofacial complex:model,which was made up of5673429units and1177892nodes, included maxilla and bones all around, parts of the skull, zygomatic temporal sutures of the both sides, and all of the cavity, sinus, pore structures and implants, titanium plate, spring. Model and modeling were of the same size with a good geometric similarity. It provided the basis of investigate the biomechanics characters preliminarily of suture with retractive forces for further research.2.3-D finite element analysis of the biomechanics mechanism of the suture with implants anchorage retractive forces:â‘ Suture were assigned isotropic material properties, the elastic moduli of50MPa produced significant variations.â‘¡As the elastic modulus decreased, the displacement and the strain were obviously which produced by the same stress.â‘¢Under the implants anchorage retractive forces, zygomatic temporal sutures showed tensile stress mostly, just few compressive stress.[Conclusion)1.Explored a way to built the3-D finite element model which contains zygomatic temporal suture of craniofacial complex from CT tomograph data. It based on the conventional two-dimensional spiral CT scan of the original DICOM digital image data and faithful to the original animal model and provided the basis of investigate the biomechanics characters preliminarily of suture with retractive forces for further research.2. Under the implants anchorage retractive forces, zygomatic temporal sutures showed tensile stress mostly, just few compressive stress.3. There is no consensus on the elastic modulus of sutural tissue, as indicated by widely varying published data. According to this study, we infer that the most reasonable modeling approach is to employ an isotropic elastic modulus for suture that is approximately50MPa. We need to do more further research to definite the elastic modulus of sutures to make the3-D finite elemet model which contains sutures more close to reality.