Durability of Siloxane-bond between Ceramic and Resin Cement after Water-storage

目的：分析树脂水泥和具有镜面抛光表面的陶瓷之间的微拉伸粘合强度，消除机械保留对粘合强度的影响，并研究由酸性磷酸酯单体活化的硅烷偶联剂形成的硅氧烷键的耐久性。方法：由长石瓷（超级瓷 AAA，Noritake）制备陶瓷样品（约 7 x 7 x 10mm），并抛光以获得镜面抛光表面金刚石化合物。超声波清洗后，用酸性磷酸酯单体（MEGA BOND PRIMER，Kuraray）活化的硅烷偶联剂（PORCELAIN BOND ACTIVATOR，Kuraray）处理表面。两个硅烷化样品使用 4-META/MMA-TBB 树脂水泥（Super-Bond，Sun Medical）在 37℃ 空气中粘合至少 24 小时。然后将粘合的样品切成平均横截面积为1.070.12mm2的梁。将它们浸入水中（第 1 组）或在 37℃ 下储存在空气中（C … More 控制）。 0（基线）、1、2、4和8周后，以1mm/min的十字头速度对它们进行微拉伸粘合强度测试。还使用用 pH=2.4 的酸性溶液活化的硅烷偶联剂（第 2 组）代替酸性单体和单独的硅烷偶联剂（第 3 组）进行了相同的实验。结果：平均基线强度约为 26 MPa，并且所有空气储存的样品在所有老化持续时间内都具有相似的强度。储存在水中的样品往往会产生较低的强度，但由于硅氧烷键的水解长达 8 周，没有明显的减弱。多元线性回归分析表明，浸入水中的试样的粘结强度显着低于存放在空气中的试样（p<0.05），而老化过程中粘结强度没有显着下降。此外，对于所有老化持续时间，组 1 和组 2 之间没有显着差异。另一方面，与第 1 组和第 2 组相比，第 3 组的粘结强度显着降低，p 值小于 0.01。结论：在目前体外研究的限制内，可以得出结论，4-META/MMA-TBB 树脂水泥和长石瓷之间的硅氧烷粘结的耐久性来自于硅烷偶联剂的酸化。较少的

Objective : To analyze micro-tensile bond strength between resin cement and a ceramic with a mirror finished surface that eliminated the effect of mechanical retention on the bond strength, and to investigate the durability of siloxane-bonds formed by an acidic phosphate monomer activated silane coupling agent.Methods : Ceramic specimen (approximately 7 x 7 x 10mm) was prepared from feldspathic porcelain (Super Porcelain AAA, Noritake), and was polished to obtain a mirror finished surface with diamond compounds. After an ultrasonic cleaning, the surface was treated by a silane coupling agent (PORCELAIN BOND ACTIVATOR, Kuraray) activated with an acidic phosphate monomer (MEGA BOND PRIMER, Kuraray). Two silanated specimens were bonded each other using 4-META/MMA-TBB resin cement (Super-Bond, Sun Medical) at 37℃ in air for at least 24 h. Then the bonded specimen was sliced into beams with a mean cross-sectional area of 1.070.12mm2. They were immersed in water (Group 1) or stored in air (C … More ontrol) at 37℃. After 0 (baseline),1,2,4 and 8 weeks, they were subjected to micro-tensile bond strength tests at a crosshead speed of 1mm/min. The same experiment was also performed using the silane coupling agent activated with an acidic solution of pH=2.4 (Group 2) instead of the acidic monomer and the silane coupling agent alone (Group 3).Results : The average baseline strength was about 26 MPa and all air-stored specimens gave similar strengths for all aging durations. The specimens stored in water tended to give lower strengths but there was no pronounced weakening due to the hydrolysis of siloxane bond up to 8 weeks. Multiple linear regression analysis revealed that the bond strength is significantly lower in specimens immersed in water than those stored in air (p<0.05), while the bond strength was not significantly decreased during aging. Moreover, there was no significant difference between Group 1 and Group 2 for all aging durations. On the other hand, Group 3 gave significantly lower bond strength compared to Groups 1 and 2, with a p-value less than 0.01.Conclusions : Within the limitation of the present in vitro study, it can be concluded that the durability of siloxane-bond between 4-META/MMA-TBB resin cement and feldspathic porcelain is derived from the acidification of the silane coupling agent. Less