NaClO溶液的浓度和作用时间对树脂牙本质粘结界面的影响  

Effect of Concentrations and Action Time of Sodium Hypochlorite(NaClO)Solution on Resin-dentin Bonding Interface

作　　者：王璐瑶 沈帅 牛玉梅[1] 潘爽[1] WANG Luyao;SHEN Shuai;NIU Yumei;PAN Shuang(Affiliated Stomatological Hospital of Harbin Medical University, Harbin 150001, China)

机构地区：[1]哈尔滨医科大学口腔医学院,黑龙江哈尔滨150001

出　　处：《口腔医学研究》2021年第2期126-130,共5页Journal of Oral Science Research

基　　金：国家自然科学基金(编号:81570963)。

摘　　要：目的:研究次氯酸钠(NaClO)溶液的浓度和作用时间对树脂牙本质粘结界面的影响。方法:选取50颗离体磨牙,去除牙齿根部及牙合面釉质,暴露牙本质层并堆塑4 mm厚的复合树脂块。分别沿两个垂直方向纵向片切样本,制备横截面积为1.0 mm2的试件条。选取50个试件随机分为5组:A1组(2.5%NaClO溶液浸泡1 h)、A2组(2.5%NaClO溶液浸泡2 h)、B1组(5.25%NaClO溶液浸泡1 h)、B2组(5.25%NaClO溶液浸泡2 h)、C组(对照组)。测试5组试件微拉伸粘接强度,体式显微镜及扫描电镜下观察断裂模式及断裂界面。结果:(1)随着NaClO溶液浓度的增高,作用时间的延长,4个实验组的微拉伸强度值与对照组相比显著降低;(2)实验组中NaClO溶液的作用时间因素对树脂牙本质粘结强度没有显著性影响(P>0.05);NaClO溶液的浓度因素对树脂牙本质粘结强度没有显著性影响(P>0.05),但NaClO溶液的浓度与时间因素之间存在交互作用,影响树脂与牙本质间的粘接强度(P<0.05)。(3)体式显微镜及扫描电镜下显示5组样本断裂模式均以粘结界面断裂为主。结论:随着NaClO溶液浓度的增高,作用时间的延长,树脂与牙本质之间的粘结强度随之下降。Objective:To investigate the influence of different concentrations and time of sodium hypochlorite(NaClO)solution on the resin-dentin bonding interface.Methods:Fifty human molars were selected to remove the tooth root and occlusal enamel,and exposed the dentin layer.A 4mm thick composite resin block was piled on the bonding surface.Teeth were sectioned vertically along two perpendicular directions into beams of approximately 1.0 mm 2 in cross-section.Fifty specimens were randomly divided into five groups:Group C(control),Group A1(2.5%NaClO solution for 1 hour),Group A2(2.5%NaClO solution for 2 hours),Group B1(5.25%NaClO solution for 1 hour),and Group B2(5.25%NaClO solution for 2 hours).The microtensile bond strength(μTBS)of five groups was tested.The stereomicroscope and SEM images of the fractured areas were used to determine the fracture mode of specimens.Results:The microtensile strength values of four experimental groups were significantly reduced compared to the control group with the increase of the concentration and the action time of NaClO solution.The action time of NaClO solution had no significant effects on the resin dentin bonding strength(P>0.05).The concentration of NaClO solution had no significant effects on the dentin bonding strength of the resin(P>0.05).However,there was an interaction effect between the concentration and action time of NaClO solution(P<0.05).Scanning electron microscope and stereo microscope showed that five groups of samples mainly fractured at the bonding interface.Conclusion:The micro-tensile bonding strength of the adhesion interface between dentin and resin can be reduced with the increase of concentration and action time of NaClO solution.

关 键 词：血管生成牙本质粘接 次氯酸钠 微拉伸粘接强度 粘接界面 双因素方差分析 

分 类 号：R78[医药卫生—口腔医学]