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首页> 外文期刊>The Journal of Prosthetic Dentistry >Finite element analysis of heat generation from different light-polymerization sources during cementation of all-ceramic crowns.
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Finite element analysis of heat generation from different light-polymerization sources during cementation of all-ceramic crowns.

机译：全瓷冠固结过程中不同光聚合源产生的热量的有限元分析。

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STATEMENT OF PROBLEM: Exothermic composite resin chemical reactions and visible light generators can produce heat during a restorative polymerization process. These thermal changes in restored teeth may cause pain and irreversible pulpitis. PURPOSE: The purpose of this study was to analyze the temperature distribution and heat flow patterns of a crowned mandibular second premolar tooth model using 3 different light-polymerization technologies and a finite element technique. MATERIAL AND METHODS: A 2-dimensional finite element model was used to simulate a clinical condition. Heat flow and thermal stress distribution in a tooth during cementation of an all-ceramic crown using 4 commercially available light-polymerization units (LPUs), each with different wavelengths (Elipar TriLight, Elipar Freelight, Apollo 95 E, and ADT 1000 PAC), were investigated. The temperature values were measured at 3, 10, 12, and 40 seconds for each light-polymerizing unit (LPU) at 6 different finite element nodes. Two-dimensional temporal and spatial distribution of the thermal stress within the tooth, including the thermal coefficients and boundary conditions of the dental materials, were obtained and evaluated. RESULTS: The temperature at the nodal points did not exceed 42 degrees C, which is a threshold value for tissue vitality within the recommended operating periods at the dentin and pulp surface for all LPUs, except for Elipar TriLight. In the case of Elipar TriLlight, the temperatures at the dentin and pulp surfaces were 47 degrees C and 42 degrees C, respectively. CONCLUSIONS: When the light-polymerization units were used according to the manufacturers' operating procedures and without prolonged operating periods, with the exception of Elipar TriLight, the investigated LPUs did not produce significant heat. However, when the operating periods were prolonged, unacceptable temperature increases were observed, especially with the high-intensity LPUs.
机译：问题陈述：放热的复合树脂化学反应和可见光发生器会在恢复性聚合过程中产生热量。修复后的牙齿中的这些热变化可能导致疼痛和不可逆的牙髓炎。目的：本研究的目的是使用3种不同的光聚合技术和有限元技术来分析下颌第二前磨牙冠的温度分布和热流模式。材料与方法：使用二维有限元模型模拟临床状况。使用4种市售的光聚合单元（LPU）在全瓷冠粘结过程中牙齿中的热流和热应力分布，每种单元具有不同的波长（Elipar TriLight，Elipar Freelight，Apollo 95 E和ADT 1000 PAC），被调查了。在6个不同的有限元节点上，每个光聚合单元（LPU）在3、10、12和40秒时测量了温度值。获得并评估了牙齿内热应力的二维时空分布，包括牙齿材料的热系数和边界条件。结果：节点的温度未超过42摄氏度，这是所有LPU在牙本质和牙髓表面在推荐操作期间内组织活力的阈值（Elipar TriLight除外）。对于Elipar TriLlight，在牙本质和牙髓表面的温度分别为47摄氏度和42摄氏度。结论：按照制造商的操作程序使用光聚合装置时，没有延长操作时间，除了Elipar TriLight之外，所研究的LPU不会产生明显的热量。但是，如果延长工作时间，则会发现温度升高得不可接受，尤其是在高强度LPU的情况下。

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