下颌骨骨折生物接骨内固定的三维有限元分析

目的:用计算机对生物可吸收板在下颌骨骨折内固定中进行三维有限元的分析,来估计生物可吸收板在典型的角部和体部骨折时能否提供所需的强度和力度。方法:在ANSYS6.0软件中建立下颌骨角部和体部骨折的内固定三维有限元模型,施加载荷后,分别计算角部、体部骨折钛板单、双板及生物可吸收板单、双板固定时,骨折段位移、骨断层的应力,固定板的应力。结果:角部和体部骨折钛板单、双板固定,生物可吸收板双板固定时骨折段位移、骨断层的应力,固定板的应力均在安全范围内;角部骨折生物可吸收板单板固定时骨折段位移超出安全范围;体部骨折生物可吸收板单板固定时固定板的应力超出安全范围。结论:生物可吸收板双板固定在下颌骨角部和体部骨折早期时可以提供骨折愈合的条件。

A Three-dimensional Finite-element Analysis of Bioabsorbable Plates and Screws for the Internal Fixation of Mandibular Fractures

Objective: This computer-based study used finite element analysis (FEA) is to assess whether internal fixation by bioabsorbable plates and screws can provide the required stiffness and strength for a typical mandibular angle and body fractures. Methods: ANSYS 6.0 software was used to establish a three-dimensional finite-element model (3D-FEM) of typical mandibular angle and body fractures with internal fixation. Applied the loads to the model, then calculated the distance changement of fracture mandible, the stress on fracture part and the plates. Results: When the mandibular angle and body fractures were fixed with single or double titanium plates and double bioabsorbable plates, the distance changes of fracture mandible, the stress on fracture part and the plates were all in the safe limits. When the mandibular angle fracture was fixed with single bioabsorbable plates, the distances change of fracturemandible were beyond the safe limits. When the mandibular body fracture was fixed with signle bioabsorbable plates, the stress on the plates were beyond the safe limits. Conclusion: Fixation with double bioabsorbable plates can provides enough health condition during the primary period of mandibular angle and body fracture.