Abstract:

BACKGROUND: Mandibular reconstruction plate is the most commonly used metals. Titanium plate titanium screw fracture and loosening leads to surgical failure. Studies show that the causes for titanium plate titanium screw fracture and loosening include overload, occlusal force, plate length, number of titanium screw, and mechanical injury.
OBJECTIVE: To establish normal mandible and mandibular defect reconstruction plate finite element model, and analyze its biomechanics.
METHODS: Based on the original CT scan image data of 1 male volunteer with normal occlusion relationship, using high-performance computer and reverse engineering software Mimics, normal mandible and mandibular reconstruction plate three-dimensional model and three-dimensional finite element model were established to simulate the vertical and oblique teeth together state, normal plate reconstruction of the mandible and the mandibular stress distribution.
RESULTS AND CONCLUSION: Three-dimensional finite element model was obtained. The normal mandible comprised of 80 044 nodes and 431 899 modules; mandibular defects (SS type) titanium mandibular reconstruction was composed of 68 400 nodes and 247 379 units. Under normal mandibular teeth in the combined posterior vertical large area, the von Mises stress was distributed in the mandibular ramus front 20.15 MPa, mandibular angle and condylar neck 19.45 MPa 15.35 MPa. von Mises stress of titanium plate mandibular reconstruction model under vertical teeth together was ascending branch of the maximum front 19.34 Mpa, condylar neck 10.21 Mpa, mandibular angle 18.56 Mpa, titanium central 24.58 MPa, screws 18.35 MPa. Simulated oblique 45° teeth together under the maximum von Mises stress distribution, the reconstruction of mandibular titanium condylar neck and ramus on the right front was 19.34 MPa, right condyle neck 10.21 Mpa, mandibular angle 18.56 MPa, titanium 24.58 MPa titanium nail 18.35 MPa. Stress of reconstruction of mandibular stress distribution plate is focused on the titanium plate, titanium screw, which is distributed unevenly compared with the normal stresses, thereby affecting stability of titanium plate reconstruction of mandibular defects.