The Study of Self Etching Dentin Bonding Agent

由于提高了边缘封闭性，抑制了边缘褐变、继发性龋病和牙髓病，修复复合树脂具有较高的拉伸粘结强度。本研究的目的是：1)比较不同条件下牛牙本质与粘结剂粘接强度的影响因素；2)测试208种牙本质自酸蚀粘结剂(SEDBA)与牛牙本质的粘接强度；3)测试市售粘结剂；4)观察牙本质与粘结剂之间的间隙。结论：1.成年牛牙1_1、1_2带髓牙拔除后12小时内使用，不能包埋于环氧树脂中，重复使用同一标本，用棉球摩擦牙本质表面并加预处理液。实验表明，在牙本质表面不喷水的情况下，用SEDBA对牙本质表面进行预处理，可以有效地提高复合树脂与弯曲牙本质表面的粘结强度。牙本质用0.3mol EDTA(含3%戊二醛、1%FeCl3和18%甲基丙烯酸羟乙酯(0.3M EDTA3-1-18)，50%磷酸pH标准溶液(pH 6.86)3-1-35，5%草酸铝/甘氨酸溶液(pH 1.0)3-1-50，4%硫酸铵35%丙烯酸3-1-50，0.5M马来酸3-1-18，3-1-35，3-1-50，1%单宁酸3-1-18，3-1-35，3-1-35，加入2.5%单宁酸3-1-18、3-1-35、3-1-50、5%单宁酸3-1-35、10%单宁酸3-1-35、3-5-35处理60s，可有效提高粘接强度，达到150kgf/cm~2以上。许多商用粘结剂对牛牙本质表面表现出相对较低的拉伸粘结强度。三层粘结剂和复合树脂的应用表明，牙本质与粘结剂之间的差距小于块状填充法。

It is to be desired that a high tensile bond strength of restorative composite resin is achieved because of improving the marginal sealing, inhibiting the marginal brown discoloration, secondary caries and pulp disease. The purpose of this study was to 1) compare the factor influencing the tensile bond strength between various condition of bovine dentin and bonding agents, 2) test the experimental 208 self etching dentin bonding agent (SEDBA) to bovine dentin, 3) test the commercial bonding agents and 4) observe the gap between the dentin and bonding agent.The following results were obtained.1. Adult bovine teeth 1_1, 1_2 with pulp should be used within 12hours after extraction without embedding them in epoxy resin, reusing of the same specimen and rubbing dentin surface by cotton pellet with pretreatment solution.2. Pretreating the dentin surface with experimental SEDBA without spraying by water was found to be very effective for incresasing the tensile bond strength of composite resin to boving dentin surfaces. Pretreating dentin with 0.3 mol EDTA containing 3% glutaraldehyde, 1% FeCl_3 and 18% hydroxyethy methacrylate (0.3 M EDTA3-1-18), 50% phosphate pH standard solution (pH6.86) 3-1-35, 5% aluminium oxalate/glycine solution (pH 1.0) 3-1-50, 4% ammonium sulfate 35% acrylic acid 3-1-50, 0.5 M maleic acid 3-1-18, 3-1-35, 3-1-50, 1% tannic acid 3-1-18, 3-1-35, 2.5%tannic aced 3-1-18, 3-1-35, 3-1-50, 5% tannic acid 3-1-35, 10% tannic acid3-1-35 and 3-5-35 for 60 seconds effectively increased the tensile bond strength up to 150 Kgf/cm^2 or more.3. Many commercial bonding agents showed relatively low tensile bond strength to bovine dentin surfaces.4. Application of three layers of bonding agent and composite resin showed smaller gap than bulk pack technique between dentin and bonding agent.