CAJ | 학술논문

目的建立反映个性化咬合接触的颞下颌关节三维有限元模型,分析咬合接触对颞下颌关节应力分布的影响.方法选1名个别正常(牙合)志愿者,整合CT、锥形束CT、MRI和石膏模型表面扫描三维数据,建立可反映牙齿(牙合)面形态的颞下颌关节三维有限元模型.检测牙尖交错位最大紧咬时的咬合接触区域,将相应区域上表面固定约束,以模拟咬合接触状况;并构建正常(牙合)与单侧后牙反(牙合)两种咬合关系,对颞下颌关节内部应力进行对比分析.结果正常(牙合)双侧颞下颌关节应力分布基本对称.单侧后牙反(牙合)与正常(牙合)颞下颌关节应力分布规律基本一致,但患侧应力明显增大;患侧髁突、关节盘、关节窝von Mises应力最大值分别为10.35、3.82、3.59 MPa;而正常(牙合)相应区域yon Mises应力最大值分别为7.32、3.18、2.84 MPa.结论反映个性化咬合接触的颞下颌关节三维有限元模型的颞下颌关节应力分布对咬合接触改变高度敏感,单侧后牙反(牙合)造成的异常咬合接触可导致患侧明显的应力集中.
목적 건립반영개성화교합접촉적섭하합관절삼유유한원모형,분석교합접촉대섭하합관절응력분포적영향.방법 선1명개별정상(아합)지원자,정합CT、추형속CT、MRI화석고모형표면소묘삼유수거,건립가반영아치(아합)면형태적섭하합관절삼유유한원모형.검측아첨교착위최대긴교시적교합접촉구역,장상응구역상표면고정약속,이모의교합접촉상황;병구건정상(아합)여단측후아반(아합)량충교합관계,대섭하합관절내부응력진행대비분석.결과 정상(아합)쌍측섭하합관절응력분포기본대칭.단측후아반(아합)여정상(아합)섭하합관절응력분포규률기본일치,단환측응력명현증대;환측과돌、관절반、관절와von Mises응력최대치분별위10.35、3.82、3.59 MPa;이정상(아합)상응구역yon Mises응력최대치분별위7.32、3.18、2.84 MPa.결론 반영개성화교합접촉적섭하합관절삼유유한원모형적섭하합관절응력분포대교합접촉개변고도민감,단측후아반(아합)조성적이상교합접촉가도치환측명현적응력집중.
Objective To develope a three-dimensional finite element model based on the individual occlusal contact data to analyze the influence of occlusal contact on the stress distribution in the temporomandibular joint(TMJ).Methods CT,cone-beam CT(CBCT),MRI and 3D scanner were used to create a three-dimensional finite element model of the stomatognathic system,which reflected the accurate morphological characteristics of the occlusal surface.The contact area was marked on the occlusal surface of the teeth based on the individual occlusal contact data obtained during the maximal volunteer clenching (MVC).Two occlusal contact conditions including normal occlusion and unilateral posterior crossbite(UPC) were constructed.The models were fixed on the contact areas to simulate the MVC condition in order to analyze the stress distribution in the TMJ.Results The stress distribution of the TMJ was approximately symmetrical in normal occlusion,but the stress values were somewhat different.No significant difference was found in stress distribution between UPC and normal occlusion,but the values were significantly higher on the crossbite side.The maximum values of von Mises stress were 10.35,3.82,3.59 MPa,on condylar process,articular disk,articular fossa of the crossbite side,respectively while on the corresponding side of the normal occlusion maximum values were 7.32,3.18,2.84 MPa,respectively.Conclusions The stress distribution of the TMJ in three-dimensional finite element model which indicated the personal occlusal contact was highly sensitive to the change of the occlusal contact.The abnormal occlusal contact caused by the UPC could lead to the stress concentration of the TMJ on the crossbite side.