Covey D A, Moon P C
Medical College of Virginia, Virginia Commonwealth University.
Am J Dent. 1991 Feb;4(1):19-22.
The objective of this study was to determine the shear bond strength of dental amalgam bonded to dentin with adhesives. Four groups of 15 permanent posterior teeth were used in this study. The occlusal enamel of the teeth was removed to produce a flat dentin surface. The teeth were embedded in phenolic rings with acrylic resin. Vinyl polysiloxane ring molds 4 mm thick with 4.5 mm circular openings were attached to the exposed dentin surface. Adhesives applied to the dentin surfaces prior to amalgam placement and condensation included: Amalgambond, a 4-META/TBB-MMA, HEMA based system (A), Panavia EX, a modified phosphate ester of Bis-GMA luting system (P), and Ketac-Cem, a glass ionomer luting cement (K). A dentin bonding agent and composite resin restoration system (Scotchbond 2/Silux Plus) was included for comparison. The specimens were stored in 37 degrees C water for 7 days prior to testing. Shear bond tests were done in an Instron machine at a crosshead speed of 0.02 inches per minute. The data were analyzed by ANOVA at 5% level of significance. The differences in shear bond strengths of the four test groups were not statistically significant (P = 0.115). Fracture patterns of the bonded amalgams, examined by SEM, were adhesive in appearance for Groups A and K and cohesive for Group P.
本研究的目的是确定用黏合剂黏合到牙本质上的牙科汞合金的抗剪黏结强度。本研究使用了四组，每组15颗恒牙后牙。去除牙齿的咬合面釉质以形成平坦的牙本质表面。用丙烯酸树脂将牙齿嵌入酚醛环中。将厚度为4毫米、圆形开口为4.5毫米的乙烯基聚硅氧烷环形模具附着在暴露的牙本质表面。在放置和压实汞合金之前应用于牙本质表面的黏合剂包括：Amalgambond，一种基于4-META/TBB-MMA、HEMA的系统（A）；Panavia EX，一种双酚A缩水甘油醚改性磷酸酯黏固系统（P）；以及Ketac-Cem，一种玻璃离子黏固剂（K）。为作比较，纳入了一种牙本质黏结剂和复合树脂修复系统（Scotchbond 2/Silux Plus）。在测试前，将标本在37摄氏度的水中储存7天。在Instron机器上以每分钟0.02英寸的十字头速度进行抗剪黏结测试。数据采用方差分析，显著性水平为5%。四个测试组的抗剪黏结强度差异无统计学意义（P = 0.115）。通过扫描电子显微镜检查，黏合汞合金的断裂模式在A组和K组中外观为黏附性，在P组中为内聚性。
