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目的分析不同粘接层厚度对全瓷冠修复系统在荷载作用下的应力分布情况的影响,为牙齿的全瓷冠修复提供理论依据。方法采用CT断层扫描技术和CAD建模软件相结合的方法,建立下颌第一磨牙模型,采用有限元方法进行应力数值模拟。结果在垂直荷载作用下,近中、远中位置的粘接层中有应力集中产生;粘接层上下表面应力分布形式相似,应力值相差不大;沿特定路径,粘接层厚度0.15 mm模型的颈部应力较0.05 mm模型应力降低近30%。结论粘接层厚度对全瓷修复系统内的应力分布有重要作用,在所研究的3个模型中,粘接层厚度0.15 mm的模型显示出更好的抗破坏能力。
Objective To analyze the influence of the thickness of different adhesive layers on the stress distribution of all-ceramic crowns restoration system under load, and provide a theoretical basis for the restoration of all-ceramic crowns. Methods The mandibular first molar model was established by using CT tomography and CAD software. The finite element method was used to simulate the stress. Results Under the vertical load, stress concentration occurred in the adhesive layers near and far and mid-distance. The stress distributions on the upper and lower surfaces of the adhesive layer were similar and the stress values did not differ significantly. Along the specific path, the adhesive layer thickness 0.15 mm The neck stress is approximately 30% lower than that of the 0.05 mm model. Conclusion The thickness of the adhesive layer plays an important role in the stress distribution in the all-ceramic restoration system. In the three models studied, the model with the adhesive layer thickness of 0.15 mm shows better anti-sabotage ability.