| [Objective] To construct the 3-D finite elemet model of craniofacial complex with ANSYS and investigate the biomechanics characters preliminarily with different direction and the magnitude of the retractive forces to maxilla of rhesus monkey.[Materials and Methods]1. Using ANSYS software to establish traction zygomatic implant and the maxillary arch splint implant and three-dimensional finite element model,Monkey skull on the finite element model of maxillary IGES file into ANSYS software,Consistent with the formation of morphological and biomechanical properties of biology, and ease of application and calculation of the craniofacial complex three-dimensional finite element model.2. Zygomatic implants anchorage for maxillary orthopedic traction effect after the three-dimensional finite element analysis:Has been established in the first part of the zygomatic implant and the implant and the maxillary traction splint arch finite element model based on,Analysis using ANSYS software and the arch bar splint implants and orthopedic traction force after the next, maxillary and nasofrontal suture, the amount of seam zygomatic, zygomatic suture, zygomatic temporal suture, transverse palatine slit in three dimensions of displacement and stress distribution. 3. Comparative analysis of the zygomatic anchorage rhesus traction splint maxillary arch orthopedic implants and the role of three-dimensional morphological changes and biomechanical mechanisms.1. Zygomatic arch splint implant to establish three-dimensional finite element model,which was made up of 3319574 units and 852556 nodes, included maxilla and bones all around, parts of the skull, and all of the cavity, sinus, pore structures. Model and modeling were of the same size with a good geometric similarity. So it could be splitted randomly or extracted a certain part for a separate study. And it had scalability which made it possible to attach brackets, arch wires, implants to start related studies.2. Zygomatic anchorage for maxillary implants after pulling monkey craniofacial three-dimensional morphological changes caused,â‘ Loading force backward on alveolar bone between the bilateral lateral incisor and canine meanwhile the force paralleled withY axis (functional occlusal plane). with the increase of the force value, each landmarks (A, N, ANS, PNS, Zm, Zm') showed larger displacement, values of displacement and force the size suggested a linear relationship. In the X-axis (horizontal) direction, all the displacements are small, showing that level backward traction will not have significant impact on the width of the upper jaw. In the Y-axis direction, all the displacements showed great changes, with the increase of the force value displacement increased significantly, showing that there was an obvious backward effect on maxilla. In the Z axis (vertical) direction, A-point and ANS point moved downward but PNS Upward, showing that maxilla rotated clockwisely. (2) The distribution of stress produced three pathways, consistenting with the three pairs of maxilla pillars basically. The stress value and the magnitude of force were of a linear relationship. With the traction value increased, stress value in all sutures increased too. Nasofrontal suture and zygomaticofrontal suture showed tensile stress, but zygomatic suture and zygomatic temporal suture showed compressive stress, showing that maxilla rotated clockwisely too. The stress distribution of Zygomatic suture was complex because of the complexity of the anatomy.3. Zygomatic arch traction splint anchorage after the three-dimensional craniofacial morphology caused by changes in its biomechanical mechanism.the displacements'changes of the points (A, N, ANS, PNS, Zm, Zm') in the Z axis were most effective, in the Y-axis were more effective, in the X-axis were almost no effect. when the traction angle was negative, points moved to the negative direction of the Z axis; when the angle is positive, points moved to the positive direction of the Z axis, indicating that the direction of traction is important. when the traction direction went down relatively under functional occlusal plane, clockwise rotation will occured on maxilla. on the contrary, the counterclockwise rotation would happened on maxilla.1. Explored a way to built the 3-D finite element model from helical CT tomography data which is based on the conventional two-dimensional spiral CT scan of the original DICOM digital image data. Using MIMICS, ANSYS software, we established the three-dimensional finite element model which adjusted to biological morphology and biomechanical characteristics, what's more it was easy to apply and calculate.2. The stress of suture and the magnitude of the force is of a linear relationship,Implants and dental arch after the two methods can traction splint maxillary distal movement.3. Implants and dental arch splints suggest different modes of action the two methods have advantages,The former power of direct spread of biological suture,The latter can be a good move to push far dentition, after indirect traction on the mandible.
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