Dimiou Anna Maria, Michalakis Konstantinos, Pissiotis Argirios
Resident, Division of Removable Prosthodontics, Department of Prosthodontics, Aristotle University School of Dentistry, Thessaloniki, Greece.
Adjunct Associate Professor, Division of Graduate and Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, Mass; Assistant Professor, Division of Removable Prosthodontics, Department of Prosthodontics, Aristotle University School of Dentistry, Thessaloniki, Greece; Private practice, Thessaloniki, Greece.
J Prosthet Dent. 2014 Jun;111(6):512-20. doi: 10.1016/j.prosdent.2013.07.021. Epub 2013 Dec 18.
Increasing the thickness of intraoral autopolymerizing hard denture base liners may result in a temperature rise and a burning sensation for patients.
The purpose of the study was to determine whether increasing the thickness of hard autopolymerizing reline resin increases the temperature of the basal seat area of a denture during the polymerization process.
Four polyethyl methacrylate and 1 polymethyl methacrylate autopolymerizing reline resin products of 3 different thicknesses were tested. A cobalt-chromium edentulous maxillary cast was used to obtain 150 stone casts, 50 for each thickness of 1, 2, and 3 mm (n=10). Polystyrene record bases were filled with the autopolymerizing reline resin mixture and placed on the cobalt-chromium cast, which was mounted on a reline index, to serve as denture substitutes. Two thermal probes were used to monitor the temperature rise, which was recorded at 30-second intervals until no further increase was noted. Collected data were subjected to a 2-way ANOVA and the Tukey honestly significant difference test (α=.05).
The mean temperature increase for the chairside denture reline procedure ranged from 39.45°C for the 1-mm thickness to 46.10°C for the 3-mm thickness. The 2-way ANOVA found significant differences (P<.001) among the different reline resin materials and thicknesses tested. All materials produced an exothermic chemical reaction. An increase in thickness was always accompanied by an increased temperature. The Tukey honestly significant difference test found that the highest temperature increase for all 3 thicknesses occurred in the polymethyl methacrylate resin.
The polymethyl methacrylate autopolymerizing hard denture base liner produced a significantly higher (P<.001) exothermic reaction than the other materials included in this study. One of the polyethyl methacrylate resins presented a higher exothermic reaction than the polymethyl methacrylate product at a 3-mm thickness, but the difference was not statistically significant. The polymethyl methacrylate resin presented the highest mean time to reach the maximum temperature for all 3 thicknesses.
增加口腔内自凝硬质义齿基托衬层的厚度可能会导致患者口腔温度升高并产生烧灼感。
本研究的目的是确定增加自凝硬质重衬树脂的厚度是否会在聚合过程中提高义齿基托部位的温度。
测试了4种聚甲基丙烯酸乙酯和1种聚甲基丙烯酸甲酯自凝重衬树脂产品，每种产品有3种不同厚度。使用钴铬无牙上颌模型制作150个石膏模型，每种厚度（1、2和3毫米）各50个（n = 10）。将自凝重衬树脂混合物填充到聚苯乙烯记录基托中，并放置在安装在重衬指示器上的钴铬模型上，作为义齿替代品。使用两个热探头监测温度升高情况，每隔30秒记录一次，直到温度不再升高。收集的数据进行双向方差分析和Tukey真实显著性差异检验（α = 0.05）。
椅旁义齿重衬过程中的平均温度升高范围为，1毫米厚度时为39.45°C，3毫米厚度时为46.10°C。双向方差分析发现，在所测试的不同重衬树脂材料和厚度之间存在显著差异（P < 0.001）。所有材料都发生了放热化学反应。厚度增加总是伴随着温度升高。Tukey真实显著性差异检验发现，所有3种厚度中温度升高最高的是聚甲基丙烯酸甲酯树脂。
聚甲基丙烯酸甲酯自凝硬质义齿基托衬层产生的放热反应比本研究中的其他材料显著更高（P < 0.001）。其中一种聚甲基丙烯酸乙酯树脂在3毫米厚度时的放热反应比聚甲基丙烯酸甲酯产品更高，但差异无统计学意义。聚甲基丙烯酸甲酯树脂在所有3种厚度下达到最高温度的平均时间最长。
