Ruse N D, Sekimoto R T, Feduik D
Department of Oral Biology, Faculty of Dentistry, The University of British Columbia, Vancouver, Canada.
Oper Dent. 1995 Sep-Oct;20(5):180-5.
The aim of this study was to investigate the effect of amalgam surface preparation on the short-and long-term in vitro shear bond strength between a dental amalgam (Valiant) and two dental composites (Herculite, Z100) mediated by three universal bonding agents (All-Bond 2, Amalgambond, and Scotchbond Multi-Purpose). Cylinders of dental composite resin were formed on, and bonded to flat amalgam surfaces. Prior to bonding, the amalgam surfaces were: a) ground flat, with the grinding lines oriented parallel to the direction of the shear stress; b) ground flat, with the grinding lines oriented perpendicular to the direction of the shear stress; or c) ground flat and then sandblasted using 50 micrometer Al2O3. A computerized Universal Testing Machine was used to determine the 1-, 7-, and 30-day shear bond strength of 162 samples (six per group) that were stored in distilled water at 37 degrees C. The results, which were statistically analyzed by performing a three-way analysis of variance (ANOVA) and 27 one-way ANOVA followed by modified (Bonferroni) t-tests for between-group comparisons (alpha = 0.05), have shown that: 1) sandblasting resulted in higher shear bond strength than grinding, except for 1-day All-Bond 2, where no differences were identified; 2) there was no difference in the shear bond strength between samples with parallel or perpendicular ground surfaces for a given bonding system and storage time; 3) for All-Bond 2, the 7-day shear bond strength of parallel and perpendicular ground samples dropped to half of the 1-day values, while the sandblasted samples showed a constant, high shear bond strength over 30 days, 4) for Amalgambond, the shear bond strength of parallel, perpendicular, and sand blasted samples was constant over 30 days; and 5) for Scotchbond Multi-Purpose, a sharp drop in the 7-day shear bond strength was recorded for all the samples, irrespective of amalgam surface preparation.
本研究的目的是调查汞合金表面处理对牙科汞合金（Valiant）与两种牙科复合材料（Herculite、Z100）之间短期和长期体外剪切粘结强度的影响，这两种复合材料由三种通用粘结剂（全粘结2号、汞合金粘结剂和3M多功能粘结剂）介导。在平坦的汞合金表面上形成并粘结牙科复合树脂圆柱体。在粘结之前，汞合金表面处理方式如下：a）磨平，磨痕方向平行于剪切应力方向；b）磨平，磨痕方向垂直于剪切应力方向；或c）磨平后用50微米的Al2O3喷砂处理。使用计算机控制的万能材料试验机测定162个样本（每组6个）在37℃蒸馏水中储存1天、7天和30天的剪切粘结强度。通过进行三因素方差分析（ANOVA）和27次单因素方差分析，然后进行修正（Bonferroni）t检验以进行组间比较（α = 0.05）对结果进行统计分析，结果表明：1）除了1天的全粘结2号外，喷砂处理后的剪切粘结强度高于打磨处理，1天的全粘结2号未发现差异；2）对于给定的粘结系统和储存时间，平行或垂直磨平表面的样本之间的剪切粘结强度没有差异；3）对于全粘结2号，平行和垂直磨平样本的7天剪切粘结强度降至1天值的一半，而喷砂处理的样本在30天内显示出恒定的高剪切粘结强度；4）对于汞合金粘结剂，平行、垂直和喷砂处理样本的剪切粘结强度在30天内保持恒定；5）对于3M多功能粘结剂，所有样本在7天时的剪切粘结强度均急剧下降，与汞合金表面处理方式无关。
