Suitability of a shear punch test for dental restorative materials
Suitability of a shear punch test for dental restorative materials
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DOI：
10.1016/s0109-5641(00)00101-9
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发表时间：
2001-09-01
期刊：
影响因子：
5
通讯作者：
McCabe, JF
中科院分区：
文献类型：
--
作者：
Nomoto, R;Carrick, TE;McCabe, JF
目的：本研究的目的是评价剪切冲击试验在确定牙体修复材料力学性能方面的适用性。通过测量和比较银汞合金、复合树脂、复合材料、含预反应玻璃离子填料的复合材料、树脂改性玻璃离子、玻璃离子和聚羧酸水泥等7种不同修复材料的抗剪冲击强度，对该方法进行了评价。方法：采用聚羧酸盐水泥和两种不同的设备设置，评估试样约束条件、试样厚度和试验速度对剪切冲孔强度的影响。采用初步试验确定的优选试验方案，对7种不同材料的剪切冲孔强度进行了测量和比较。每种材料制备20个圆盘试样，厚0.5 mm，直径10 mm，限制在试验设备内，以1.0 mm/min的速度进行试验。结果：随着约束试件扭矩的增大，剪切冲头强度增大。不同厚度试件的抗剪冲孔强度无差异。试验速度为1.0 mm/min时，剪切冲孔强度最大。含预反应玻璃离子填料>银汞合金>复合材料>树脂改性玻璃离子>玻璃离子>聚羧酸酯的>复合材料的抗剪冲孔强度值减小。7种不同类型的修复材料在抗剪冲击强度上存在明显差异。在剪切冲击试验中，试样以周向开裂方式发生断裂。然而，对于一些玻璃离子和汞合金试样也观察到径向开裂。意义：本研究表明，所描述的简单测试适合标准化目的。(C) 2001年牙科材料学会。Elsevier Science Ltd.出版。版权所有。
Objective: The aim of the study was to evaluate the suitability of a shear punch test for determining the mechanical properties of dental restorative materials. The method was evaluated by measuring and comparing the shear punch strength of seven different restorative materials, that is amalgam, composite resin, compomer, composite containing pre-reacted glass ionomer filler, resin modified glass ionomer, glass ionomer and polycarboxylate cement.Method: The effects of specimen restraining conditions, specimen thickness and test speed on the shear punch strength were evaluated using polycarboxylate cement and two different equipment set-ups. Using the preferred testing regime as determined in the preliminary experiments, the shear punch strength of seven different materials were measured and compared. Twenty disc specimens, 0.5 nun thick and 10 mm diameter, were prepared for each material, restrained within the test equipment and tested at a speed of 1.0 mm/min.Results: The shear punch strength increased as the torque used for restraining a specimen was increased. There was no difference in shear punch strength for specimens of different thickness. The greatest shear punch strength was obtained at the test speed of 1.0 mm/min. The shear punch strength values decreased in the order composite > composite containing pre-reacted glass ionomer filler > amalgam > compomer > resin-modified glass ionomer > glass ionomer > polycarboxylate. A difference in the shear punch strength for seven different kinds of restorative materials clearly emerged. Specimen fracture occurred by circumferential cracking for the shear-punch test. However, for some glass ionomer and amalgam specimens radial cracking was also observed.Significance: This study suggests that the simple test described is suitable for standardization purposes. (C) 2001 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.