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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparision of diametral tensile strength of microwave and oven-dried investment materials.
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Comparision of diametral tensile strength of microwave and oven-dried investment materials.

机译：微波和烘干的投资材料的径向拉伸强度比较。

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STATEMENT OF PROBLEM: Microwave drying technique for investment materials is believed to be timesaving by accelerating the elimination of free water content. PURPOSE: This study compared the diametral tensile strength of 4 investment materials used in removable partial denture framework fabrication. The investment materials were subjected to microwave and conventional oven drying at different time intervals. MATERIAL AND METHODS: Type III partial denture casting investments (Wirovest, Wiroplus, Biosint, PH2) were tested. A total of 160 specimens were prepared in cylindrical form at a height of 40 mm and a diameter of 20 mm, in accordance with the manufacturers' recommendations. Forty specimens were prepared from each product; 20 specimens were dried at 230 degrees C for 1 hour in an electric furnace, the other 20 were dried in a microwave oven for 10 minutes at 600 W. The dried specimens were tested at 2- and 4-hour intervals in diametral compression at a crosshead speed of 0. 5 cm/min. RESULTS: The microwave drying technique resulted in greater diametral tensile strength values for all investment materials. CONCLUSION: Within the limitations of this study, microwave drying of type III dental investment materials at 600 W for 10 minutes was, apart from strengthening the material, timesaving for the dental laboratory.
机译：问题陈述：通过加快消除游离水含量，用于投资材料的微波干燥技术被认为可以节省时间。目的：本研究比较了可移动局部义齿框架制造中使用的4种投资材料的径向拉伸强度。将被投资材料以不同的时间间隔进行微波和常规烤箱干燥。材料和方法：测试了III型局部义齿铸造投资（Wirovest，Wiroplus，Biosint，PH2）。根据制造商的建议，共准备了160个圆柱形样品，高度为40 mm，直径为20 mm。每个产品准备了40个样本;将20个样品在电炉中于230摄氏度下干燥1小时，将另外20个样品在600 W的微波炉中干燥10分钟。将干燥后的样品在2到4个小时的间隔内在径向压缩下进行测试。十字头速度为0. 5厘米/分钟。结果：微波干燥技术使所有包埋材料的径向拉伸强度值更高。结论：在这项研究的局限性内，III型牙科用投资材料在600 W的功率下微波干燥10分钟，除了增强材料外，还为牙科实验室节省了时间。

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