Effect of hybrid layer on fracture toughness of adhesively bonded dentin-resin composite joint.
Effect of hybrid layer on fracture toughness of adhesively bonded dentin-resin composite joint.
复制标题
杂化层对牙本质-树脂复合材料粘接接头断裂韧性的影响
DOI：
10.1016/s0109-5641(98)00014-1
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Park,JB
中科院分区：
文献类型：
--
作者：
Armstrong,SR;Boyer,DB;Keller,JC;Park,JB
目的 混合层的微机械保留通常被认为是当前一代牙本质粘合剂的粘附机制。本研究的目的是评估具有和不具有这种混合层的市售牙本质粘结剂的界面断裂韧性。方法将十颗拔出的磨牙 (AB2) 压平在咬合面上，按照制造商的说明使用 All-Bond 2 通用粘合剂系统 (Bisco)，并形成复合树脂 (Prodigy, Kerr) 牙冠。另一组十颗磨牙 (AB2Cl) 进行相同的处理，不同之处在于酸蚀后使用 5.25% 次氯酸钠轻轻擦洗 1 分钟，以去除暴露于酸的胶原蛋白。平面应变 V 形缺口短杆断裂韧性样本由所有 20 个复合材料牙冠制成，并根据 ASTM E1304-89 进行测试。每组均在 0.1mmmin−1 的拉伸模式下进行失效测试，并使用失效时的最大载荷来确定平面应变断裂韧性 (KQvM)。计算威布尔参数并测试断裂概率分布在 95% 置信水平下的显着差异。对断裂样品 (18/20) 采用扫描电子显微镜来描述失效模式。结果对于 AB2 和 AB2Cl，最大载荷 (KoQvM) 为 0.97MPam1/2 和 0.81MPam1/2，威布尔模量分别为 4.7 和 3.9，威布尔分布与特征平面应变断裂韧性没有显着差异。所有 AB2 样品均在粘合接头内失效，而 AB2Cl 裂纹从粘合树脂和牙本质的界面传播至牙本质 1-2μm。意义在本研究的条件下，胶原蛋白的存在并不能显着增强粘合接头。牙本质-复合树脂双材料界面的界面断裂韧性评估为未来的研究带来了希望。
ObjectivesMicromechanical retention from the hybrid layer is generally believed to be the mechanism of adhesion of current generation dentin bonding agents. The purpose of this investigation is to evaluate the interfacial fracture toughness of a commercial dentin bonding agent with and without this hybrid layer.MethodsTen extracted molars (AB2) were flattened on the occlusal surface, All-Bond 2 Universal Adhesive System (Bisco) was applied according to manufacturer's directions and a composite resin (Prodigy, Kerr) crown was formed. Another group of ten molars (AB2Cl) was handled identically with the exception of a 1min gentle scrubbing application of 5.25% sodium hypochlorite after acid etching to remove the acid-exposed collagen. Plane-strain chevron-notch short bar fracture toughness specimens were fabricated from all 20 composite crowns and tested according to ASTM E1304-89. Each group was tested to failure in tensile mode at 0.1mmmin−1and the maximum load at failure was used to determine plane-strain fracture toughness (KQvM). Weibull parameters were calculated and fracture probability distributions were tested for significant difference at the 95% confidence level. Scanning electron microscopy was employed on broken specimens (18/20) to describe the failure mode.ResultsWeibull distributions were not significantly different with characteristic plane-strain fracture toughness from maximum load (KoQvM) of 0.97MPam1/2and 0.81MPam1/2and a Weibull modulus of 4.7 and 3.9, respectively, for AB2 and AB2Cl. All AB2 samples failed within the adhesive joint, while the AB2Cl crack propagated from the interphase of adhesive resin and dentin to 1–2μm into dentin.SignificanceUnder the conditions of this study, the presence of collagen did not contribute to a significantly stronger bonded joint. Interfacial fracture toughness evaluation of the dentin–composite resin bimaterial interface shows promise for future investigations.