次氯酸钠溶液表面处理对牙本质粘接强度的影响

发布时间：2018-01-31 01:10

  本文关键词： 牙本质 次氯酸钠 微拉伸粘接强度　出处：《北京大学学报(医学版)》2017年01期 　论文类型：期刊论文

【摘要】：目的:研究根管治疗过程中次氯酸钠(sodium hypochlorite,Na OCl)冲洗溶液对牙本质粘接强度的影响。方法:选取新鲜拔除的人第三磨牙15颗,牙冠完整无龋坏,未经牙体或牙髓治疗,去除釉质,暴露中层牙本质,600目砂纸打磨牙本质表面1 min,去离子水冲洗1 min,制备牙本质平面试件。试件随机分为3组,采用不同表面处理方法后制作粘接试件:A组(阴性对照组),去离子水处理牙本质平面试件20 min;B组(2.50%Na OCl实验组),2.50%Na OCl溶液处理牙本质平面试件20 min,每5分钟更换1次新鲜溶液;C组(5.25%Na OCl实验组),5.25%Na OCl溶液处理牙本质平面试件20 min,每5分钟更换1次新鲜溶液。处理后所有试件表面均使用自酸蚀粘接剂SE bond进行粘接处理,上方堆塑5 mm高的AP-X复合树脂,分层固化后,粘接试件置于37℃去离子水中储存24 h后,使用金刚石切割机垂直于粘接界面切割,制作1.0 mm×1.0 mm条状试样(n=45)。用微拉伸测试仪测试条状试样微拉伸粘接强度(MPa),体视显微镜下观察试样断裂类型(界面破坏、内聚破坏及混合破坏类型),采用单因素方差分析比较不同实验组的微拉伸粘接强度,并用Post-hoc test(LSD)法进行两两比较,应用卡方检验比较不同组之间断裂类型分布的差异,并进行两两比较。结果:2.50%Na OCl实验组[(26.04±5.74)MPa]和5.25%Na OCl实验组[(24.46±3.77)MPa]的粘接强度明显低于未经Na OCl溶液处理的阴性对照组[(48.71±7.77)MPa],P=0.000。与阴性对照组比较,2.50%和5.25%Na OCl实验组粘接强度分别下降了46.5%和50.2%,2.50%和5.25%Na OCl实验组间粘接强度差异无统计学意义(P=0.214)。不同实验组之间断裂类型分布差异均具有统计学意义(χ~2=56.324,P=0.000),阴性对照组试样断裂类型以混合破坏类型(68.9%)为主,界面破坏类型(24.4%)次之,内聚破坏类型(6.7%)最少,2.50%Na OCl实验组与5.25%Na OCl实验组发生界面破坏类型的比例明显高于阴性对照组(P=0.000),2.50%Na OCl实验组和5.25%Na OCl实验组间的断裂类型分布差异无统计学意义(P=0.197),且均未发现内聚破坏。结论:Na OCl处理过的牙本质与复合树脂的粘接强度明显降低。
[Abstract]:Objective: to study sodium hypochlorite hypochlorite during root canal therapy. Methods: 15 freshly extracted human third molars were selected. The crown was completely free of caries and enamel was removed without dental or pulp treatment. The surface of dentin was ground with 600 mesh sandpaper exposed to middle layer and washed with deionized water for 1 min. The dentin plane specimen was prepared. The specimens were randomly divided into 3 groups. Different surface treatment methods were used to make the bonding specimen: group A (negative control group), the plane dentin specimen treated with deionized water for 20 min; Group B (2. 50%) was treated with Na OCl solution for 20 min, and the fresh solution was replaced once every 5 minutes. Group C: 5.25% Na OCl test group treated with Na OCl solution for 20 min. Fresh solution was changed once every 5 minutes. After treatment, all specimens were bonded with self-etching adhesive SE bond. The top of the sample was plasticized with 5 mm high AP-X composite resin. The adhesive specimens were stored in deionized water at 37 鈩，

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