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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of temperature increase in the pulp chamber during the polymerization of materials used for the direct fabrication of provisional restorations.
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Comparison of temperature increase in the pulp chamber during the polymerization of materials used for the direct fabrication of provisional restorations.

机译：比较用于直接制作临时修复体的材料聚合过程中纸浆腔中温度的升高。

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STATEMENT OF PROBLEM: Polymerization of resin materials used for the fabrication of provisional restorations is associated with an exothermic reaction. This temperature rise may present a serious biological problem, since it can cause iatrogenic thermal trauma to the pulp. PURPOSE: This in vitro study compared the temperature increase in the pulp chamber of a molar placed in contact with different resins used for the direct fabrication of provisional restorations. MATERIAL AND METHODS: Polymethyl methacrylate (Jet), polyethyl methacrylate (Snap), polyvinylethyl methacrylate (Trim), Bis-acrylic composite (Protemp II), and a VLP urethane dimethacrylate (Revotec LC) were compared with respect to their exothermic reaction properties during polymerization. A mandibular molar prepared for a complete coverage restoration was placed in an acrylic resin block. A thermal probe connected to a digital thermometer was placed into the pulp chamber. Specimens were submerged in a water bath to simulate intraoral conditions. The provisional resin materials tested were measured and mixed according to manufacturer's instructions. The resin mixture was placed into a vacuum-formed acetate template and was then positioned on the prepared molar tooth. The temperature was recorded during polymerization at 30-second intervals until it was evident that the peak temperature had been reached. Temperature increase was measured ( degrees C) for both the initial crown fabrication and the reline procedures. Data were analyzed with descriptive statistics, 1-way analysis of variance, and Tukey Honestly Significant Difference tests (alpha=.05). RESULTS: One-way ANOVA revealed significant differences (F=57.010, P<.0001) in temperature rise for different provisional resin materials. Mean temperature increase for the provisional crown fabrication ranged from 37.76 degrees C for the polyvinylethyl methacrylate to 39.40 degrees C for the polymethyl methacrylate. Mean temperature rise for the reline procedures ranged from 36.80 degrees C forthe polyvinylethyl methacrylate to 37.69 degrees C for the polymethyl methacrylate. All of the tested materials produced an exothermic chemical reaction. CONCLUSIONS: Polymethyl methacrylate produced the higher exothermic reaction in both initial crown fabrication and reline procedures. Polyethyl methacrylate, polyvinylethyl methacrylate, and Bis-acrylic resins tested were not significantly different from each other.
机译：问题陈述：用于制造临时修复物的树脂材料的聚合与放热反应有关。温度升高可能会带来严重的生物学问题，因为它可能对纸浆造成医源性热损伤。目的：这项体外研究比较了与直接用于制作临时修复体的不同树脂接触的磨牙的牙髓腔内温度的升高。材料与方法：比较了聚甲基丙烯酸甲酯（Jet），聚甲基丙烯酸乙酯（Snap），聚甲基丙烯酸乙酯（Trim），双丙烯酸复合材料（Protemp II）和VLP聚氨酯二甲基丙烯酸酯（Revotec LC）的放热反应性能。聚合。将准备完全覆盖的下颌磨牙放入丙烯酸树脂块中。将连接到数字温度计的热探针放入纸浆室。将标本浸入水浴中以模拟口内状况。根据制造商的说明测量并混合测试的临时树脂材料。将该树脂混合物置于真空形成的乙酸酯模板中，然后置于制备的磨牙上。在聚合过程中以30秒的间隔记录温度，直到明显达到峰值温度为止。对于初始胎冠制造和重整步骤均测量了温度升高（摄氏度）。使用描述性统计数据，方差的1向分析和Tukey诚实显着差异检验（alpha = .05）对数据进行分析。结果：单因素方差分析显示不同临时树脂材料的温升存在显着差异（F = 57.010，P <.0001）。临时胎冠制造的平均温度升高范围从甲基丙烯酸聚乙烯乙酯的37.76摄氏度到聚甲基丙烯酸甲酯的39.40摄氏度。重排程序的平均温升范围为：对于甲基丙烯酸聚乙烯乙酯为36.80摄氏度，对于聚甲基丙烯酸甲酯为37.69摄氏度。所有测试的材料均发生放热化学反应。结论：聚甲基丙烯酸甲酯在最初的牙冠制造和修复过程中产生了更高的放热反应。所测试的聚甲基丙烯酸乙酯，甲基丙烯酸聚乙烯基乙酯和双丙烯酸树脂之间没有显着差异。

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