Biomaterials Science, Biomimetics & Biophotonics Research Group, King's College London Dental Institute, London, UK.
Dent Mater. 2011 Jun;27(6):563-72. doi: 10.1016/j.dental.2011.02.010. Epub 2011 Mar 30.
To compare microtensile bond strengths (MTBS) subsequent to load cycling of resin bonded acid-etched or EDTA-treated dentin using a modified ethanol wet-bonding technique.
Flat dentin surfaces were obtained from extracted human molars and conditioned using 37% H(3)PO(4) (PA) (15s) or 0.1M EDTA (60s). Five experimental adhesives and one commercial bonding agent were applied to the dentin and light-cured. Solvated experimental resins (50% ethanol/50% comonomers) were used as primers and their respective neat resins were used as the adhesives. The resin-bonded teeth were stored in distilled water (24h) or submitted to 5000 loading cycles of 90N. The bonded teeth were then sectioned in beams for MTBS. Modes of failure were examined by scanning electron microscopy.
The most hydrophobic resin 1 gave the lowest bond strength values to both acid and EDTA-treated dentin. The hydrophobic resin 2 applied to EDTA-treated dentin showed lower bond strengths after cycling load but this did not occur when it was bonded to PA-etched dentin. Resins 3 and 4, which contained hydrophilic monomers, gave higher bond strengths to both EDTA-treated or acid-etched dentin and showed no significant difference after load cycling. The most hydrophilic resin 5 showed no significant difference in bond strengths after cycling loading when bonded to EDTA or phosphoric acid treated dentin but exhibited low bond strengths.
The presence of different functional monomers influences the MTBS of the adhesive systems when submitted to cyclic loads. Adhesives containing hydrophilic comonomers are not affected by cycling load challenge especially when applied on EDTA-treated dentin followed by ethanol wet bonding.
比较经负载循环后使用改良乙醇湿粘接技术的酸蚀或 EDTA 处理牙本质的树脂粘结微拉伸粘结强度（MTBS）。
从人磨牙中获得平面牙本质表面，并用 37% H(3)PO(4)（PA）（15s）或 0.1M EDTA（60s）进行预处理。将五种实验性胶粘剂和一种商业粘结剂应用于牙本质并用光固化。将溶解的实验性树脂（50%乙醇/50%共聚单体）用作底漆，将其各自的纯树脂用作粘结剂。将粘结的牙齿储存在蒸馏水中（24 小时）或进行 5000 次 90N 的负载循环。然后将粘结的牙齿切成梁以进行 MTBS。通过扫描电子显微镜检查失效模式。
最疏水的树脂 1 对酸蚀和 EDTA 处理的牙本质给出的粘结强度值最低。疏水树脂 2 应用于 EDTA 处理的牙本质，在循环负载后显示出较低的粘结强度，但在粘结到 PA 酸蚀牙本质时则不会发生。含有亲水性单体的树脂 3 和 4 对 EDTA 处理或酸蚀牙本质均给出较高的粘结强度，在循环负载后没有显著差异。最亲水的树脂 5 在循环负载后与 EDTA 或磷酸处理牙本质粘结时粘结强度没有显著差异，但粘结强度较低。
不同功能单体的存在会影响在循环负载下粘结系统的 MTBS。含有亲水性共聚单体的胶粘剂不受循环负载挑战的影响，特别是在 EDTA 处理的牙本质上应用后，再进行乙醇湿粘接。
