摘要
目的通过对根管壁内表面进行不同方式的处理来提高纤维桩的粘接强度。方法 36颗新鲜无龋单根管离体前磨牙桩道预备后随机分为6组,分别进行根管内壁处理。Ⅰ组（对照组）使用生理盐水冲洗,Ⅱ组使用2%氯己定溶液和17%乙二胺四乙酸（EDTA）溶液冲洗,Ⅲ组使用3%过氧化氢溶液、17%EDTA溶液冲洗,Ⅳ组使用5.25%次氯酸钠、17%EDTA冲洗,Ⅴ组使用35%磷酸凝胶酸蚀30 s,Ⅵ组使用17%EDTA凝胶处理1 min,最后Ⅱ~Ⅵ组再使用生理盐水冲洗。采用3M ESPE RelyXTM Unicem树脂粘接剂粘接纤维桩后进行薄片推出强度测试,扫描电镜观察根管内壁及粘接界面的微观形态,体视显微镜观察纤维桩粘接界面断裂方式。结果Ⅱ~Ⅵ组均可有效地去除玷污层,Ⅱ、Ⅴ组粘接界面可观察到树脂突形成。各组试件的断裂方式均以含有牙本质内聚破坏的混合破坏为主。与对照组相比,Ⅱ、Ⅴ组纤维桩的粘接强度明显提高（P〈0.05）。结论 2%氯己定溶液和17%EDTA溶液冲洗及35%磷酸凝胶酸蚀可显著提高纤维桩的粘接强度,桩道深度对纤维桩粘接强度无明显影响。
Objective The purpose of this study is to find some appropriate treatments on the dentin of root canal wall to obtain better bonding strength of fiber posts.Methods 36 new extracted non-caries single root canal anterior teeth were collected and post spaces were prepared.The teeth were divided into six groups randomly and processed by different post-space treatments： Sodium chloride irrigation（groupⅠ,control group）;irrigation with 2% chlorhexidine solution followed by 17% EDTA solution（groupⅡ）;irrigation with 3% hydrogen peroxide followed by 17% EDTA solution（group Ⅲ）;irrigation with 5.25% sodium hypochlorite（NaClO） followed by 17% EDTA solution（group Ⅳ）; etching with 35% phosphoric acid-gel for 30 s（group Ⅴ）;17% EDTA-gel for 1 min（group Ⅵ）.After each post-space treatment,sodium chloride irrigation was applied in Ⅱ~Ⅵ group.Fiber posts were then luted in the treated roots using 3M ESPE RelyXTM Unicem and the thin-slice push-out test was performed.The dentin surfaces and bonding interface were examined under scanning electron microscope.Fracture mode of fiber posts were observed by stereo microscope.Results Group Ⅱ~Ⅵ were effective in getting rid of smear layer.Resin rags of dentin bonding interface were observed in group Ⅱ and group Ⅴ.The majority fracture mode of specimens in each group were mixed mode which contained dentin destruction.Compared with control group,the bonding strength of group Ⅱ,Ⅴ increased obviously（P0.05）.Conclusion Irrigation with 2% chlorhexidine solution followed by 17% EDTA solution and 35% phosphoric acid-gel etching improved the bonding strength of fiber posts.The depth of post space has no influence of bond strength.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2011年第2期210-213,共4页
West China Journal of Stomatology
关键词
纤维桩
粘接强度
表面处理
fiber post
bonding strength
surface treatment
