Albogha Mhd Hassan, Takahashi Ichiro
Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
J Biomech. 2015 Nov 5;48(14):3751-6. doi: 10.1016/j.jbiomech.2015.08.015. Epub 2015 Aug 21.
Many finite element (FE) studies used different settings for modeling orthodontic mini-implants (OMIs). This study aims to compare different approaches for modeling OMI with FE method, to exhibit the role of key factors in modeling process. A computerized tomography (CT) dataset of a living human is used to develop subject-specific FE model of bone specimen, and a microCT was used to generate the geometry of OMI. Another five models were developed to assess the effect of changing different settings of FE modeling process. These five models differed from the subject-specific model in either: (i) bone properties' assignment method, (ii) geometries and constrains' conditions, or (iii) simulation method of bone-implant contact (BIC). The models presented significant differences in maximum principal strain distribution. These differences were most apparent when the models differed either in the nature of BIC or the method of assigning bone properties. The models different only in bone geometries showed differences in the intensity of strain rather than its distribution pattern. There is a need for assessment and validation of all FE modeling approaches currently used for simulation of mechanical environment in the bone surrounding OMIs.
许多有限元（FE）研究在对正畸微型种植体（OMIs）进行建模时采用了不同的设置。本研究旨在比较使用有限元方法对OMI进行建模的不同方法，以展示关键因素在建模过程中的作用。使用一名活体人类的计算机断层扫描（CT）数据集来建立特定于个体的骨标本有限元模型，并使用显微CT生成OMI的几何形状。还开发了另外五个模型，以评估改变有限元建模过程的不同设置所产生的影响。这五个模型与特定于个体的模型在以下方面有所不同：（i）骨属性的赋值方法，（ii）几何形状和约束条件，或（iii）骨-种植体接触（BIC）的模拟方法。这些模型在最大主应变分布上呈现出显著差异。当模型在BIC的性质或骨属性的赋值方法上不同时，这些差异最为明显。仅在骨几何形状上不同的模型在应变强度上存在差异，而非应变分布模式。有必要对目前用于模拟OMIs周围骨力学环境的所有有限元建模方法进行评估和验证。
