The influence of cross-sectional shape and surface area on the microtensile bond test
The influence of cross-sectional shape and surface area on the microtensile bond test
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DOI：
10.1016/s0109-5641(98)00034-7
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发表时间：
1998-06-01
期刊：
影响因子：
5
通讯作者：
Tyas, MJ
中科院分区：
文献类型：
--
作者：
Phrukkanon, S;Burrow, MF;Tyas, MJ
目标。本研究的目的是确定四种牙本质粘接系统(Scotchond MP Plus，OptiBond FL，OptiBond Solo，One-Step)的横截面面积形状(圆柱形和矩形)和粘接表面积对微拉伸粘结强度和应力分布的影响。此外，还建立了有限元分析(FEA)模型来研究应力分布。拔出的人磨牙垂直切割，去除咬合牙釉质；牙齿的一半用于矩形标本，另一半用于圆柱形标本。根据制造商的说明粘结咬合牙本质，并用一块树脂复合材料覆盖。对于圆柱形试件，用金刚石钻在车床上成形粘结的牙本质，在粘结界面产生面积为1.1、1.5或3.1 mm(2)的试件。将矩形试件剖分成棒状试件，再将其成形为沙漏状试件，其面积与圆形试件相同。以1 mm min(-1)的速度拉伸粘结。用双因素方差分析、单因素方差分析、LSD检验和学生t检验比较平均结合强度。用扫描电子显微镜观察骨折表面，并用Kruskal-Wallis和Mann-Whitney U检验比较骨折模式的出现频率。建立有限元模型，模拟粘接的横截面面积，确定应力分布。除了使用Scotchond MP Plus和One-Step的矩形试件外，3.1mm2粘结面积组的粘结强度显著低于1.1 mm(2)粘结面积组(p<；0.05)。粘结面积为1.1 mm或1.5 mm的大多数圆柱形试件在牙本质与粘接树脂之间的界面处出现粘接失败。圆柱形和矩形试件之间没有差异。断裂模式与有限元模型计算得到的应力分布规律相吻合。结果表明，使用小表面积的试验方法比使用大表面积的试验方法产生的粘结强度更高，而截面形状对粘结强度的影响不大。这可能是由于小面积试件中出现的缺陷较少所致。(C)1998年，由爱思唯尔科学有限公司代表否认材料学会出版。
Objectives. The purpose of this study was to determine the effect of the cross-sectional area shape (cylindrical vs, rectangular) and the bonding surface area on the microtensile bond strengths and stress distribution of four dentin adhesive systems (Scotchbond MP Plus, OptiBond FL, OptiBond Solo, One-Step). In addition, finite element analysis (FEA) models were developed to investigate stress distributions.Methods. Extracted human molars were cut vertically and the occlusal enamel removed; one-half of the tooth was used for rectangular specimens, the other half for cylindrical specimens. The occlusal dentin was bonded according to the manufacturers' directions and covered with a block of resin composite. For the cylindrical specimens, the bonded dentin was shaped with a diamond bur on a lathe to produce specimens of area 1.1, 1.5 or 3.1 mm(2) at the bonded interface. The rectangular specimens were sectioned to obtain bar-shaped specimens, which were shaped to produce hourglass shaped specimens with the same area as the round specimens. Bonds were stressed in tension at a speed of 1 mm min(-1). The mean bond strengths were compared using two-way ANOVA, one-way ANOVA, LSD and Student's t tests. The fractured surfaces were examined by scanning electron microscopy, and the frequencies of the fracture modes were compared using the Kruskal-Wallis and Mann-Whitney U tests. FEA models were created simulating the cross-sectional areas for bonding to determine the stress distribution.Results. The 3.1 mm2 bonding area groups showed significantly lower bond strengths than the 1.1 mm(2) bonding area groups (p < 0.05), except for the rectangular specimens using Scotchbond MP Plus and One-Step. Most cylindrical specimens of bonding area 1.1 or 1.5 mm exhibited adhesive failure at the interface between the dentin and the adhesive resin. No differences were determined between cylindrical and rectangular specimens. The fracture mode matched the stress distribution patterns calculated from the FEA modeling.Significance. The results indicate that the test methods using small surface areas produce higher bond strengths than those using larger surface areas, and that cross-sectional shape has little effect. This is probably a result of fewer defects occurring in the small-area specimens. (C) 1998 Published by Elsevier Science Ltd on behalf of the Academy of Denial Materials.