Effects of cross-sectional area on resin-enamel tensile bond strength.
Effects of cross-sectional area on resin-enamel tensile bond strength.
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DOI：
10.1016/s0109-5641(97)80098-x
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发表时间：
1997-09
期刊：
影响因子：
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通讯作者：
Y. Shono;M. Terashita;E. Pashley;P. Brewer;D. Pashley
中科院分区：
文献类型：
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作者：
Y. Shono;M. Terashita;E. Pashley;P. Brewer;D. Pashley
目的假设牙釉质粘结强度与粘结截面积呈负相关，树脂-釉质粘结强度存在地区差异。方法将拔除的人第三磨牙的面部和舌面用240粒砂纸研磨0.3 mm，然后按照制造商的说明用Clearfi Liner Bond 2或Scotchond多功能粘接剂系统粘接。然后，粘合表面接受树脂复合材料的堆积。在水中放置24 h后，用金刚石锯将粘结的牙齿垂直连续切成1.0 mm厚的薄板，并在显微镜下用金刚石锯将树脂-牙釉质界面的粘结表面积从0.5~3.0MMZ变化。修剪区域从面牙釉质或舌侧牙釉质的咬合1/3到中部1/3，到颈部1/3不等。然后将修剪后的试件粘接到Bencor多T设备上，放置在Instron测试机中，以1 mm/min的速度施加应力直至破坏。使用三因素方差分析比较粘结强度(颊与舌，咬合与中牙合与颈部-三分之一，与材料)。结果在两种粘结系统中，抗拉粘结强度(y轴)与粘结截面积(x轴)之间存在极显著的指数负相关(p<；0.001)，其y截距分别为51和59 Mpa。用这两种材料测得的粘结强度在咬合的三分之一处最高，显著高于颈部牙釉质的粘结强度(p<；0.05)。与树脂-牙本质粘结一样，树脂-釉质粘结与横截面面积呈负相关。这种关系在粘结表面积低于2mm2时变得更加明显，这可能是因为随着样品变小，界面应力增加的数量减少了。
OBJECTIVEIt was hypothesized that there is an inverse relationship between resin-enamel bond strength and bonded cross-sectional area, and that there are regional differences in resin-enamel bond strength.METHODSThe facial and lingual surfaces of extracted human third molars were ground down 0.3 mm using 240 grit abrasive paper and were then bonded with either Clearfil Liner Bond 2 or Scotchbond Multi-Purpose Plus adhesive systems using the manufacturer's instructions. The bonded surfaces then received a resin composite build-up. After 24 h of storage in water, the bonded teeth were vertically serially sectioned into 1.0 mm thick slabs using a diamond saw, and the bonded surface area at the resin-enamel interface was varied from 0.5 to 3.0 mmz using a diamond saw under microscopic observation. The trimmed region was varied from the occlusal third of the facial or lingual enamel to the middle third, to the cervical third. The trimmed specimens were then glued to a Bencor Multi-T device, placed in an Instron testing machine and stressed to failure at 1 mm/min. A three-factor ANOVA was used to compare bond strengths (buccal vs. lingual, occlusal vs. middle vs. cervical-third, vs. materials). Regression analysis was used to examine the relationship between bond strength and bonded cross-sectional area for each material on occlusal enamel.RESULTSFor both bonding systems, there was a highly significant (p < 0.001) inverse exponential relationship between tensile bond strength (y axis) and bonded cross-sectional area (x axis) with y intercepts of 51 and 59 MPa for Clearfil Liner Bond 2 and Multi-Purpose Plus, respectively. Using both materials, the highest bond strengths were measured in the occlusal third, which were significantly higher (p < 0.05) than those made to cervical enamel.SIGNIFICANCELike resin-dentin bonds, resin-enamel bonds exhibit an inverse relationship with cross-sectional area. This relationship becomes more apparent at bonded surface areas below 2 mm2and is probably due to reductions in the number of interfacial stress-raisers as samples are made smaller.