Effect of Self-adhesive Resin Cement and Tribochemical Treatment on Bond Strength to Zirconia

Aim To evaluate the interactive effects of different self- adhesive resin cements and tribochemical treatment on bond strength to zirconia. Methodology The following self-adhesive resin cements for bonding two zirconia blocks were evaluated： Maxcem （MA）, Smartcem （SM）, Rely X Unicem Aplicap （UN）, Breeze （BR）, Biscem （BI）, Set （SE）, and Clearfil SA luting （CL）. The specimens were grouped according to conditioning as follows： Group 1, polishing with 600 grit polishing paper; Group 2, silica coating with 110 μm Al2O3 particles which modified with silica; and, Group 3, tribochemical treatment - silica coating ＋ silanization. Specimens were stored in distilled water at 37℃ for 24 hours before testing shear bond strength. Results Silica coating and tribochemical treatment significantly increased the bond strength of the MA, UN, BR, B1, SE and CL to zirconia compared to #600 polishing. For both #600 polished and silica coating treatments, MDP- containing self-adhesive resin cement CL had the highest bond strengths to zirconia. Conclusion Applying silica coating and tribochemical treatment improved the bond strength of self-adhesive resin cement to zirconia, especially for CL.

核电厂放射性含硼废树脂水泥固化工艺的改进研究

为了提高水泥固化方法对含硼废树脂的包容率,通过改变固化配方,在大亚湾核电厂(GNPS)和岭澳核电厂(LNPS)的放射性废物处理系统进行了现场固化试验研究。结果表明,使用改进后的工艺进行水泥固化,废树脂的包容率从32.4%提高到46.3%,相对于原工艺包容率增加幅度42.9%,固化体体积减少了30%。该方法生产的固化体性能满足GB 14569.1—2011的各项要求。经过6年的工程实践,证明改进后工艺可在不改变核电厂固化系统原设施的情况下使用。

新型自黏结树脂水门汀与传统聚羧酸锌水门汀临床黏结力的比较

目的：观察新型自黏结树脂水门汀的黏结力，探讨其临床适用性。方法选择2010年5月~2011年10月在本院就诊的58例进行根管治疗的患者，随机分为试验组30例和对照组28例，试验组采用新型自黏结树脂水门汀黏结修复处理，对照组采用传统聚羧酸锌水门汀黏结修复处理，观察两组的患牙修复成功率并分别测试和记录1、3、6、12、24个月的黏结强度。结果试验组患牙修复成功率为97.1%（34/35），对照组患牙修复成功率为94.1%（32/34），两组比较差异无统计学意义（χ2=0.3795，P=0.5379）。1个月后，两组黏结强度比较差异无统计学意义（P〉0.05）；3、6、12、24个月后，试验组的黏结强度明显高于对照组，差异有统计学意义（P〈0.05）。结论相对于传统聚羧酸锌水门汀，新型自黏结树脂水门汀虽未明显提高患牙修复功率，但其黏结强度大，可以更好地增强黏结效果，值得临床推广应用。