中文摘要：

目的探讨建立拾力作用下前牙牙槽骨改建数学模型的可行性。方法建立包含上颌中切牙及牙周膜、骨皮质、骨松质的三维有限元模型，基于应变能密度的骨改建理论，通过开发Abaqus有限元分析软件中的用户材料子程序，分析上颌中切牙在加载60—150N猞力作用下牙槽骨受力和骨密度的变化情况，依据骨密度的变化反映牙槽骨的改建情况。结果随着猞力的增加，前牙牙槽骨颊侧颈缘处承受的压应力逐渐增大，牙槽骨密度则逐渐降低，骨皮质密度由1．74g／cm3降至1．63g／cm^3，骨松质密度由0．90g／cm。降至0．77g／cm^3，均小于各自相应初始骨密度值。牙槽骨舌侧承受的拉应力也逐渐增大，但骨密度值无明显变化；当载荷超过120N后，骨皮质密度逐渐降低（1．74—1．73g／cm^3），骨松质无明显变化。结论依据应变能密度的骨改建理论分析牙槽骨组织在猞力作用下组织改建过程的方法可行，可为临床工作中分析牙槽骨的改建过程和预测改建结果提供有效的方法。

英文摘要：

Objective To study the remodeling of the anterior alveolar bone with parodontium under physiology loading using finite element method （FEM） and theory of bone remodeling. Methods A FEM model of the maxillary central incisor with parodontium was established, and the change of bone density during the remodeling of alveolar bone was investigated under physiology loading （60-150 N） based on the theory of bone remodeling about strain energy density （SED）. The finite element analysis software Abaqus user material subroutine（UMAT） were used. Results With the increase of physiology loading, the pressure stress on the buccal cervical margin increased gradually while the density was decreased gradually. The cortical bone was lower than its initial density 1.74 g/cm3 , which was 1.74-1.63 g/cm3. The density of cancellous bone was 0. 90-0. 77 g/cm3 , which was lower than its intial density 0. 90 g/cm3. The lingual cervical margin was under tensile stress which also increased with loading, the density had no significant change. When the achieve to 120 N, the density of cortical bone was 1.74-1.73 g/cm3. No significant change was found in the cancellous bone. Conclusions The simulation of the perodontium remodeling is achieved and proved to be effective by the relevant research based on the method of the study. And the result will be helpful to form the basis of analysis bone remodeling process and predict the results in the clinical work.