al-Moayad M, Aboush Y E, Elderton R J
Department of Conservative Dentistry, University of Bristol Dental School.
Br Dent J. 1993 Nov 20;175(10):363-7. doi: 10.1038/sj.bdj.4808326.
This study assessed the effectiveness of a glass-ionomer liner/base (Vitrebond) and two adhesive resins (Amalgambond and Panavia Ex) in bonding amalgam to enamel/dentine cavities in vitro. Restorations placed without any intermediary, or with varnish, served for comparison purposes. Standardised unretentive cavities on the buccal sides of a total of 78 extracted human molar teeth were prepared to receive the restorations. After application of the adhesive materials (without light curing the Vitrebond), the cavities were filled with amalgam (Dispersalloy). Each specimen was stored for 24 hours in distilled water at 37 degrees C. The amalgam restorations were then pulled from the cavities using an Instron machine and the retentive strength values were recorded. The results showed that any of the three adhesive intermediary agents substantially enhanced the retention of the amalgam restorations. The Vitrebond specimens had the highest mean retentive strength value (133 N), followed by Amalgambond (18% lower) and Panavia Ex (38% lower); the difference between the value for the Vitrebond specimens and that for the Panavia Ex specimens was statistically significant. The Vitrebond specimens failed due to gross enamel fractures and a cohesive failure of the glass-ionomer layer. The Amalgambond specimens failed at the resin/amalgam interface, while the Panavia Ex specimens showed enamel fractures and failure at the resin/dentine interface. It appears that Vitrebond has the potential for being an effective amalgam adhesive in vivo.
本研究评估了玻璃离子衬层/基底材料（维他玻璃离子粘固粉）和两种粘结树脂（银汞粘结剂和帕纳维亚Ex）在体外将银汞合金粘结至牙釉质/牙本质洞的有效性。未使用任何中间材料或使用清漆进行修复作为对照。在总共78颗拔除的人类磨牙的颊侧制备标准化的非固位洞以接受修复。在应用粘结材料后（维他玻璃离子粘固粉未进行光固化），用银汞合金（Dispersalloy）填充窝洞。每个标本在37℃的蒸馏水中储存24小时。然后使用英斯特朗材料试验机将银汞合金修复体从窝洞中拔出并记录固位强度值。结果表明，三种粘结中间材料中的任何一种均显著提高了银汞合金修复体的固位力。维他玻璃离子粘固粉标本的平均固位强度值最高（133 N），其次是银汞粘结剂（低18%）和帕纳维亚Ex（低38%）；维他玻璃离子粘固粉标本与帕纳维亚Ex标本的值之间的差异具有统计学意义。维他玻璃离子粘固粉标本因牙釉质严重骨折和玻璃离子层的内聚破坏而失败。银汞粘结剂标本在树脂/银汞合金界面处失败，而帕纳维亚Ex标本显示牙釉质骨折以及在树脂/牙本质界面处失败。看来维他玻璃离子粘固粉有可能成为体内有效的银汞合金粘结剂。
