CAJ | 학술논문

目的对比分析牙尖交错(牙合)时个别后牙反(牙合)和正常(牙合)颞下颌关节(temporomandibular joint,TMJ)内各结构的应力分布情况,以期从生物力学角度为个别后牙反(牙合)正畸治疗的必要性提供依据.方法利用已建立的正常(牙合)TMJ几何模型,建立个别后牙反(牙合)和正常(牙合)TMJ三维有限元模型.对两种模型施加相同的(牙合)力(100 N)和边界条件,模拟牙尖交错(牙合)时的工况加载,分析比较个别后牙反(牙合)和正常(牙合)TMJ的应力分布情况.结果与正常(牙合)相比,个别后牙反(牙合)TMJ内部各结构应力分布规律无明显变化,但应力值有所增大,且分布更不均匀.个别后牙反(牙合)关节盘von Mises应力最大值为0.792 MPa,最大主应力最大值为0.598 MPa,最小主应力最大值为-0.744MPa;正常(牙合)关节盘von Mises应力最大值为0.592 MPa,最大主应力最大值为0.395 MPa,最小主应力最大值为-0.554MPa.结论牙尖交错(牙合)时个别后牙反(牙合)双侧TMJ内应力分布不均匀,应力值比正常(牙合)有所增大,可引起TMJ的超负荷应力和局部应力集中,临床上应对个别后牙反(牙合)进行及时积极的治疗.
목적 대비분석아첨교착(아합)시개별후아반(아합)화정상(아합)섭하합관절(temporomandibular joint,TMJ)내각결구적응력분포정황,이기종생물역학각도위개별후아반(아합)정기치료적필요성제공의거.방법 이용이건립적정상(아합)TMJ궤하모형,건립개별후아반(아합)화정상(아합)TMJ삼유유한원모형.대량충모형시가상동적(아합)력(100 N)화변계조건,모의아첨교착(아합)시적공황가재,분석비교개별후아반(아합)화정상(아합)TMJ적응력분포정황.결과 여정상(아합)상비,개별후아반(아합)TMJ내부각결구응력분포규률무명현변화,단응력치유소증대,차분포경불균균.개별후아반(아합)관절반von Mises응력최대치위0.792 MPa,최대주응력최대치위0.598 MPa,최소주응력최대치위-0.744MPa;정상(아합)관절반von Mises응력최대치위0.592 MPa,최대주응력최대치위0.395 MPa,최소주응력최대치위-0.554MPa.결론 아첨교착(아합)시개별후아반(아합)쌍측TMJ내응력분포불균균,응력치비정상(아합)유소증대,가인기TMJ적초부하응력화국부응력집중,림상상응대개별후아반(아합)진행급시적겁적치료.
Objective To analyze the stress distribution of temporomandibular joint (TMJ) in posterior cross-bite of individual teeth and in normal occlusion during the intercuspal occlusion (ICO).Methods On the basis of the geometric TMJ model of normal occlusion,the TMJ finite element model of posterior cross-bite of individual teeth was reconstructed.The occlusal force and boundary conditions were applied on the model.Using three-dimensional finite element method (FEM),the stress distribution of TMJ in posterior cross-bite of individual teeth was analyzed by simulating the ICO load.Results No significant differences were found in stress distribution in various TMJ structures between posterior cross-bite of individual teeth and normal occlusion.However,the stress level was higher and the stress distribution was more inhomogeneous in posterior cross-bite of individual teeth than in normal occlusion.In the cross-bite malocclusion of individual posterior teeth,the maximum of von Mises stress was 0.792 MPa,the maximum principal stress was 0.598 MPa and the mimimum principal stress was-0.744 MPa.But in normal occlusion,the maximum of von Mises stress was 0.592 MPa,the maximum principal stress was 0.395 MPa and the mimimum principal stress was-0.554 MPa.Conclusions When the ICO load was applied,the stress distribution of TMJ was more inhomogeneous and the stress level was higher in posterior cross-bite of individual teeth than in normal occlusion.