RELATIONSHIP BETWEEN SURFACE-AREA FOR ADHESION AND TENSILE BOND STRENGTH - EVALUATION OF A MICRO-TENSILE BOND TEST
RELATIONSHIP BETWEEN SURFACE-AREA FOR ADHESION AND TENSILE BOND STRENGTH - EVALUATION OF A MICRO-TENSILE BOND TEST
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DOI：
10.1016/0109-5641(94)90067-1
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发表时间：
1994-07-01
期刊：
影响因子：
5
通讯作者：
PASHLEY, DH
中科院分区：
文献类型：
--
作者：
SANO, H;SHONO, T;PASHLEY, DH
目标.本研究旨在检验牙本质粘结表面积与粘结材料抗张强度之间无相关性的零假设。从拔除的人第三磨牙的咬合面去除釉质，并且用结合到牙本质的树脂复合物覆盖整个平坦表面以形成平坦的树脂复合物冠。24 h后，将粘接后的牙体标本沿牙体长轴方向平行切成10-20个薄片，薄片上半部分为树脂复合材料，下半部分为牙本质。使用高速金刚石钻头将这些小部分修整成沙漏形状，最后部分位于粘合界面处。通过改变试样厚度和宽度来改变表面积。使用定制的夹具在万能试验机中测量拉伸粘结强度。拉伸粘结强度与粘结表面积呈负相关。在低于0.4mm（2）的表面积下，对于Clearfil Liner Bond 2（Kuraray Co.，有限公司）、Scotchbond MP（3 M牙科产品）为38 MPa，Vitremer（3 M牙科产品）为20 MPa。在这些小表面积处，所有粘合失效本质上都是粘合剂失效。重要性。这种新的方法允许测量高粘结强度，而不会导致牙本质的内聚破坏。它还允许在单个牙齿内进行多次测量。
Objectives. The purpose of this study was to test the null hypothesis that there is no relationship between the bonded surface area of dentin and the tensile strength of adhesive materials.Methods. The enamel was removed from the occlusal surface of extracted human third molars, and the entire flat surface was covered with resin composite bonded to the dentin to form a flat resin composite crown. Twenty-four hours later, the bonded specimens were sectioned parallel to the long axis of the tooth into 10-20 thin sections whose upper part was composed of resin composite with the lower half being dentin. These small sections were trimmed using a high speed diamond bur into an hourglass shape with the narrowest portion at the bonded interface. Surface area was varied by altering the specimen thickness and width. Tensile bond strength was measured using custom-made grips in a universal testing machine.Results. Tensile bond strength was inversely related to bonded surface area. At surface areas below 0.4 mm(2), the tensile bond strengths were about 55 MPa for Clearfil Liner Bond 2 (Kuraray Co., Ltd.), 38 MPa for Scotchbond MP (3M Dental Products), and 20 MPa for Vitremer (3M Dental Products). At these small surface areas all of the bond failures were adhesive in nature.Significance. This new method permits measurement of high bond strengths without cohesive failure of dentin. It also permits multiple measurements to be made within a single tooth.