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首页> 外文期刊>The Journal of Prosthetic Dentistry >The effect of polymerization cycles on porosity of microwave-processed denture base resin.
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The effect of polymerization cycles on porosity of microwave-processed denture base resin.

机译：聚合周期对微波加工义齿基础树脂孔隙率的影响。

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STATEMENT OF PROBLEM: Although most of the physical properties of denture base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. PURPOSE: This study evaluated the effect of different microwave polymerization cycles on the porosity of a denture base resin designed for microwave polymerization. MATERIAL AND METHODS: Thirty-two rectangular resin specimens (65 x 40 x 5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and 1 control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes+500 W for 90 seconds, (C) 320 W for 3 minutes+0 W for 4 minutes+720 W for 3 minutes, and (T) 74 degrees C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (alpha=.05). RESULTS: The mean values and SDs of the percent mean porosity were: A=1.05%+/-0.28%, B=0.91%+/-0.15%, C=0.88%+/-0.23%, T=0.93%+/-0.23%. No significant differences were found in mean porosity among the groups evaluated. CONCLUSION: Within the limitations of this study, a denture base resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized denture base resin tested.
机译：问题陈述：尽管已经显示出通过微波能量聚合的义齿基体树脂的大多数物理性质与通过常规热聚合方法聚合的树脂相似，但是存在孔隙率是一个问题。目的：本研究评估了不同的微波聚合周期对用于微波聚合的义齿基托树脂孔隙率的影响。材料与方法：将32个矩形树脂样品（65 x 40 x 5 mm）分为3个实验组（A，B和C; Onda-Cryl，微波聚合树脂）和1个对照组（T; Classico，热聚合树脂），按照以下聚合周期进行：（A）500 W 3分钟，（B）90 W 13分钟+500 W 90秒，（C）320 W 3分钟+0 W 4分钟+720 W 3分钟，（T）74摄氏度9小时。通过测量样品在水中之前和之后的体积来计算孔隙率。使用方差的单向分析（alpha = .05）分析数据。结果：平均孔隙度百分数的平均值和SD为：A = 1.05％+ /-0.28％，B = 0.91％+ /-0.15％，C = 0.88％+ /-0.23％，T = 0.93％+ / -0.23％。在评估组之间，平均孔隙度没有发现显着差异。结论：在本研究的范围内，专门为微波聚合测试而设计的义齿基料树脂不受不同聚合周期的影响。孔隙率类似于测试的常规热聚合义齿基料树脂。

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