Nakabayashi N, Watanabe A, Gendusa N J
Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan.
Dent Mater. 1992 Jul;8(4):259-64. doi: 10.1016/0109-5641(92)90096-u.
This study investigated adhesion to dentin of a modified 4-META/MMA-TBB resin (4-methacryloxyethyl trimellitate anhydride in methyl methacrylate initiated by tri-n-butyl borane) which does not require PMMA powder to polymerize. Ground bovine dentin specimens were pre-treated with an aqueous solution of 10% citric acid and 3% ferric chloride (10-3). This solution removes the smear layer and demineralizes the dentin, exposing collagen. Improved bond strengths were obtained when a HEMA-primer was applied to 10-3 pre-treated dentin. SEM examination revealed the formation of a transitional zone of resin-reinforced-dentin (hybrid layer) in 10-3 pre-treated, HEMA-primed samples. The adhesive monomer impregnated exposed collagen fibrils and, upon polymerization, became entangled with them to create the hybrid layer, essential in achieving significantly high tensile bonding strengths. HEMA enhanced the penetration capability of dentinal substrates. After polymerization and formation of the hybrid layer, auto-cured acrylic resin, photo-cured composite and amalgam were all capable of adhering to the dentin. The modified 4-META/MMA-TBB resin created significant adhesive bonds to 10-3 pre-treated ground bovine dentin.
本研究调查了一种改性的4-META/MMA-TBB树脂（由三正丁基硼烷引发的甲基丙烯酸甲酯中的4-甲基丙烯酰氧基乙基偏苯三酸酐）对牙本质的黏附情况，该树脂聚合时不需要聚甲基丙烯酸甲酯粉末。将磨碎的牛牙本质标本用10%柠檬酸和3%氯化铁的水溶液（10-3）进行预处理。该溶液可去除玷污层并使牙本质脱矿，暴露出胶原蛋白。当将甲基丙烯酸羟乙酯（HEMA）底漆应用于经10-3预处理的牙本质时，可获得更高的粘结强度。扫描电子显微镜检查显示，在经10-3预处理、涂有HEMA底漆的样本中形成了树脂增强牙本质的过渡区（混合层）。粘性单体浸渍暴露的胶原纤维，聚合时与它们缠结形成混合层，这对于实现显著高的拉伸粘结强度至关重要。HEMA增强了牙本质底物的渗透能力。聚合和混合层形成后，自凝丙烯酸树脂、光固化复合材料和汞合金都能够黏附到牙本质上。改性的4-META/MMA-TBB树脂与经10-3预处理的磨碎牛牙本质形成了显著的粘结。
