CAJ | 학술논문

背景：对釉牙本质界缺损的下颌前磨牙进行有限元接触分析，为楔状缺损的预防及咬合治疗提供生物力学依据。 　　目的：分析釉牙本质界潜行性破坏对牙颈部硬组织应力分布的影响。 　　方法：在下颌前磨牙沿釉牙本质界建立三角形缺损设计楔状缺损模型，模拟紧咬和咀嚼运动中牙的受力情况，对下颌前磨牙颈部硬组织进行非线性接触分析。 　　结果与结论：模拟紧咬和咀嚼运动中牙的受力情况，釉牙本质界缺损的下颌前磨牙缺损区均存在明显应力集中。随着缺损高度的增加，应力值增大，应力集中程度也增加。可见釉牙本质界破坏改变了缺损区牙颈部的应力分布，临床上楔状缺损应及时充填治疗。
배경：대유아본질계결손적하합전마아진행유한원접촉분석，위설상결손적예방급교합치료제공생물역학의거。 　　목적：분석유아본질계잠행성파배대아경부경조직응력분포적영향。 　　방법：재하합전마아연유아본질계건립삼각형결손설계설상결손모형，모의긴교화저작운동중아적수력정황，대하합전마아경부경조직진행비선성접촉분석。 　　결과여결론：모의긴교화저작운동중아적수력정황，유아본질계결손적하합전마아결손구균존재명현응력집중。수착결손고도적증가，응력치증대，응력집중정도야증가。가견유아본질계파배개변료결손구아경부적응력분포，림상상설상결손응급시충전치료。
BACKGROUND:Finite element contact analysis was performed in premolars of lower mandible with enamelo-dentinal junction defects, which provided biomechanical evidence for the prevention of wedge-shaped defect and occlusion treatment. OBJECTIVE:To analyze the effects of undermining damage of the enamelo-dentinal junction on the stress distribution of sclerous tissues of dental cervix. METHODS:Triangle defects were established and models of wedge-shaped defect were designed in mandibular premolar along the enamelo-dentinal junction. The stresses during tightly biting and masticatory movement were simulated. Nonlinear contact analysis was conducted in sclerous tissues of mandibular premolar in the buccal cervical region. RESULTS AND CONCLUSION:By simulating the stresses during tightly biting and masticatory movement, the stresses were concentrated in the defected regions of mandibular premolar at the enamelo-dentinal junction. With the defect length increased in size, the stress value and the magnitude of the stress field both increased. These indicated that the destruction of enamelo-dentinal junction altered stress distribution in the buccal cervical region. In the clinic, wedge-shaped defect should be fil ed promptly.