CAJ | 학술논문

目的：探讨在不同力作用下，长度和直径同时连续变化情况下微种植体尺寸的优化设计，以期为临床上合理选择微种植体尺寸提供理论基础。方法建立长度和直径连续变化的微种植体及周围颌骨组织的三维有限元模型，设定长度变化范围为6~12 mm，直径变化范围为1.2~2.0 mm，在微种植体头部的横槽内分别加载水平力（HF）和复合力（CF），观察长度和直径同时变化对周围颌骨等效应力峰值（Max EQV）及微种植体位移峰值（Max DM）的影响。结果在两种力的作用下，随着长度和直径的增加，颌骨Max EQV和微种植体Max DM均下降，当长度大于9 mm时，各评估指标值较小且变化幅度较小。灵敏度分析显示，直径对评估指标的影响较大。在CF作用下，直径对评估指标的影响较HF作用下显著。结论在本研究所设定的参数范围内，微种植体的长度应不超过9 mm，运用微种植体对牙齿进行转矩控制时，其直径应超过1.2 mm。
목적： 탐토재불동력작용하，장도화직경동시련속변화정황하미충식체척촌적우화설계，이기위림상상합리선택미충식체척촌제공이론기출。방법 건립장도화직경련속변화적미충식체급주위합골조직적삼유유한원모형，설정장도변화범위위6~12 mm，직경변화범위위1.2~2.0 mm，재미충식체두부적횡조내분별가재수평력（HF）화복합력（CF），관찰장도화직경동시변화대주위합골등효응력봉치（Max EQV）급미충식체위이봉치（Max DM）적영향。결과 재량충력적작용하，수착장도화직경적증가，합골Max EQV화미충식체Max DM균하강，당장도대우9 mm시，각평고지표치교소차변화폭도교소。령민도분석현시，직경대평고지표적영향교대。재CF작용하，직경대평고지표적영향교HF작용하현저。결론 재본연구소설정적삼수범위내，미충식체적장도응불초과9 mm，운용미충식체대아치진행전구공제시，기직경응초과1.2 mm。
Objective To investigate the effect of different length and diameters on the stability of mini implant and to select optimal length and diameter using continuous variation of parameters. Methods To perform 3-dimensional finite element analysis, finite element models of a maxilla, and mini implants with length of 6-12 mm and diameters of 1.2-2.0 mm were generated. Load of two different forces were applied to the head of mini implant. One type was horizontal force (HF), the other was composite force (CF). The maximum equivalent stress (Max EQV) in maxilla and the maximum displacement (Max DM) of mini implant were evaluated. Results The Max EQV in maxilla and Max DM of mini implant decreased as length and diameter increased. When length was more than 9 mm, the evaluation indexes were small and had a less change. Datas indicated that diameter played a more important role in reducing target, and was a more effective parameter in re-ducing Max EQV when CF was loaded. Conclusion From biomechanical point of view, the choice of the length should not be more than 9 mm. When CF is loaded using the mini implant, diameter exceeding 1.2 mm are optimal design for mini implant.