CAJ | 학술논문

背景：有观点认为根管治疗和桩核修复会增加牙齿折裂的危险，纤维桩核修复能否提高重度楔状缺损牙的抗折性能？三维有限元法可以将复杂的牙体组织简化成可被计算机分析的模型，通过对这些模型的分析进行生物力学方面的研究。目的：分析纤维桩复合树脂修复重度楔状缺损前后对牙体组织应力分布的影响。方法：建立上颌前磨牙重度楔状缺损及采用复合树脂纤维桩修复后的三维有限元模型，模拟267 N，45°斜向载荷时的受力情况，分析最大主应力的分布特征。结果与结论：重度楔状缺损模型在缺损尖端应力集中最明显。修复后模型的最大主应力分布趋势与正常牙类似，拉应力均匀分布于牙根颊面的中上部。说明纤维桩复合树脂修复有助于降低重度楔状缺损患牙颈部折裂的风险。
배경：유관점인위근관치료화장핵수복회증가아치절렬적위험，섬유장핵수복능부제고중도설상결손아적항절성능？삼유유한원법가이장복잡적아체조직간화성가피계산궤분석적모형，통과대저사모형적분석진행생물역학방면적연구。목적：분석섬유장복합수지수복중도설상결손전후대아체조직응력분포적영향。방법：건립상합전마아중도설상결손급채용복합수지섬유장수복후적삼유유한원모형，모의267 N，45°사향재하시적수력정황，분석최대주응력적분포특정。결과여결론：중도설상결손모형재결손첨단응력집중최명현。수복후모형적최대주응력분포추세여정상아유사，랍응력균균분포우아근협면적중상부。설명섬유장복합수지수복유조우강저중도설상결손환아경부절렬적풍험。
BACKGROUND:Someone regards that treatments such as root canal therapy and post-core restoration can increase the fracture probability of teeth. Can fiber reinforced composite post enhance the fracture resistance of the severe wedge-shaped defected premolar? Three-dimensional finite element can simplify complex dental systems into a model analyzed by computer, and conduct biomechanical research through the model analysis. OBJECTIVE:To analyze the stress distribution of sever wedge-shaped defected first premolar which restored by fiber reinforced composite post and composite resin. METHODS:We established the three-dimensional finite element models of severe wedge-shaped defected maxil ary first premolar before and after restoration with fiber reinforced composite post and composite resin. The maximum bite force was designed to 267 N that was applied at 45° angle. Then, we analyzed the distribution of maximum principal stress in finite element models. RESULTS AND CONCLUSION:The maximum principal stress was concentrated in the tip of defected region. After restoration, the distribution of maximum principal stress was similar to that of the normal premolar, and the tensile stress was distributed uniformly in the upper-central part of buccal root. It may be beneficial for improving fracture resistance ability of severe wedge-shaped-defect premolar by restoration with fiber reinforced composite post and composite resin.