光照对纤维桩周围双固化树脂粘接效果影响研究

Effect of photopolymerization on microhardness of dual-polymerized resin around a translucent fiber post in root canal

目的观察光照对纤维桩周围双固化树脂粘接效果的影响。方法选用2011年5—11月佛山市向阳口腔医院就诊患者拔除的新鲜完整单根管牙40颗,随机等分为非光照组和光照组。两组牙齿均在截去牙冠后行根管预备,充填,然后植入纤维桩,并使用Bisco全酸蚀粘接系统对纤维桩进行粘接,非光照组仅进行化学固化,光照组在化学固化的基础上再使用QHL75光固化灯照射40s。分别测量两组牙齿根尖段、根中段和根管口段的显微硬度和粘接强度。结果显微硬度:光照组牙齿根管口段的显微硬度明显高于根中段和根尖段及非光照组各段(P<0.05),而光照组根中段和根尖段间差异无统计学意义(P>0.05)。粘接强度:光照组牙齿根管口段的粘接强度高于根中段和根尖段及非光照组各段,差异有统计学意义(P<0.05),且根中段和根尖段的粘接强度差异也有统计学意义(P<0.05)。结论光照有助于加强Bisco全酸蚀粘接剂的聚合程度,从而有助于纤维桩固位。

Objective To evaluate the effect of photopolymerization on adhesion of dual-polymerized resin cement at three locations when a translucent fiber post was used. Methods Single-rooted bovine teeth received fiber post systems using a dual-polymerized resin cement. In Group 1, the posts were cemented but not photopolymerized, and in Group 2, the posts were both cemented and photopolymerized. After cementation, approximately 1.5 mm thick sections were ob- tained for regional microhardness evaluations. Results The microhardness of resin near the canal orifice was signifi- cantly higher than others. Conclusion The mode of polymerization of the cement tested in combination with the translu- cent fiber post system dose not affect the microhardness of the cement in the root except that near the canal orifice.