目的探讨两种桩系统修复对根管治疗牙强度影响的临床效果。方法选取60颗于我院进行近期拔除的完整人上颌中切牙,将其随机分为两组,对30颗对照组牙齿实施铸造镍铬桩核及铸造全冠修复治疗,对30颗观察组牙齿实施玻璃纤维桩Para Post Fiber ...目的探讨两种桩系统修复对根管治疗牙强度影响的临床效果。方法选取60颗于我院进行近期拔除的完整人上颌中切牙,将其随机分为两组,对30颗对照组牙齿实施铸造镍铬桩核及铸造全冠修复治疗,对30颗观察组牙齿实施玻璃纤维桩Para Post Fiber White、复合树脂核及铸造全冠修复治疗,观察两组患者的治疗效果。结果两组患者的牙断裂强度无显著差别,P>0.05,无统计学意义;其中观察组的可修复性断裂效果显著优于对照组,P<0.05,有统计学意义。结论两种桩系统对治疗后牙强度的影响无显著差别,其中玻璃纤维桩术弹性模型与牙本质近似,可修复的破坏效果好。展开更多
目的研究自酸蚀粘接流动树脂（DvadFlow，DF）初始应用层厚度对牙本质粘接性能的影响。方法选取离体人磨牙20颗，制备牙本质试件，将牙本质试件分为4组。G0．5、G1．0、G2．0直接使用DF，初始应用层厚度分别为0．5、1．0和2．0mm；GOB...目的研究自酸蚀粘接流动树脂（DvadFlow，DF）初始应用层厚度对牙本质粘接性能的影响。方法选取离体人磨牙20颗，制备牙本质试件，将牙本质试件分为4组。G0．5、G1．0、G2．0直接使用DF，初始应用层厚度分别为0．5、1．0和2．0mm；GOB配合使用OptiBond All in One（OB）自酸蚀粘接剂后再使用DF，初始应用层厚度为2．0mm。4组上部均充填复合树脂，然后制备截面积为1mm×1mm的条形试样并测定微拉伸粘接强度，每组试样均为15个。扫描电镜观察4组牙本质-树脂界面的形态及断裂类型。结果GOB、G0．5、G1．0及G2．0组微拉伸粘接强度依次减小，分别为（20．19±3．11）、（8．65±1．58）、（6．65±1．13）及（5．70±0．60）MPa，4组间总体比较及两两比较差异均有统计学意义（P〈0．05）。G0．5、G1．0、G2．0及GOB组粘接断裂类型为混合破坏B2型（DF自酸蚀粘树脂与牙本质混合破坏）的样本比例分别为14／15、13／15、14／15及13／15。结论直接使用DF自酸蚀粘接流动树脂，其与牙本质的粘接强度随材料初始应用层厚度增加而降低。展开更多
Objective To investigate the effect of multiple coatings of the one-step self-etching adhesive on immediate microtensile bond strength to primary dentin.Methods Twelve caries-free human primary molars were randomly di...Objective To investigate the effect of multiple coatings of the one-step self-etching adhesive on immediate microtensile bond strength to primary dentin.Methods Twelve caries-free human primary molars were randomly divided into 2 groups with 6 teeth each.In group 1,each tooth was hemisected into two halves.One half was assigned to control subgroup 1,which was bonded with a single-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 1 in which the adhesive was applied three times before light curing.In group 2,the teeth were also hemisected into two halves.One half was assigned to control subgroup 2,which was bonded with the single-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 2 in which three layers of adhesive were applied with light curing each successive layer.Microtensile bond strength was immediately tested after specimen preparation.Results When the adhesive was applied three times before light curing,the bond strength of the experimental subgroup 1(n=33,57.49±11.61 MPa) was higher than that of the control subgroup 1(n=31,49.71±11.43 MPa,P<0.05).When using the technique of applying multiple layers of adhesive with light curing each successive layer,no difference of immediate bond strength was observed between the control subgroup 2 and the experimental subgroup 2(P>0.05).Conclusion Multiple coatings of one-step self-etching adhesive can increase the immediate bond strength to primary dentin when using the technique of light-curing after applying three layers of adhesive.展开更多
文摘目的探讨两种桩系统修复对根管治疗牙强度影响的临床效果。方法选取60颗于我院进行近期拔除的完整人上颌中切牙,将其随机分为两组,对30颗对照组牙齿实施铸造镍铬桩核及铸造全冠修复治疗,对30颗观察组牙齿实施玻璃纤维桩Para Post Fiber White、复合树脂核及铸造全冠修复治疗,观察两组患者的治疗效果。结果两组患者的牙断裂强度无显著差别,P>0.05,无统计学意义;其中观察组的可修复性断裂效果显著优于对照组,P<0.05,有统计学意义。结论两种桩系统对治疗后牙强度的影响无显著差别,其中玻璃纤维桩术弹性模型与牙本质近似,可修复的破坏效果好。
文摘目的研究自酸蚀粘接流动树脂（DvadFlow，DF）初始应用层厚度对牙本质粘接性能的影响。方法选取离体人磨牙20颗，制备牙本质试件，将牙本质试件分为4组。G0．5、G1．0、G2．0直接使用DF，初始应用层厚度分别为0．5、1．0和2．0mm；GOB配合使用OptiBond All in One（OB）自酸蚀粘接剂后再使用DF，初始应用层厚度为2．0mm。4组上部均充填复合树脂，然后制备截面积为1mm×1mm的条形试样并测定微拉伸粘接强度，每组试样均为15个。扫描电镜观察4组牙本质-树脂界面的形态及断裂类型。结果GOB、G0．5、G1．0及G2．0组微拉伸粘接强度依次减小，分别为（20．19±3．11）、（8．65±1．58）、（6．65±1．13）及（5．70±0．60）MPa，4组间总体比较及两两比较差异均有统计学意义（P〈0．05）。G0．5、G1．0、G2．0及GOB组粘接断裂类型为混合破坏B2型（DF自酸蚀粘树脂与牙本质混合破坏）的样本比例分别为14／15、13／15、14／15及13／15。结论直接使用DF自酸蚀粘接流动树脂，其与牙本质的粘接强度随材料初始应用层厚度增加而降低。
文摘Objective To investigate the effect of multiple coatings of the one-step self-etching adhesive on immediate microtensile bond strength to primary dentin.Methods Twelve caries-free human primary molars were randomly divided into 2 groups with 6 teeth each.In group 1,each tooth was hemisected into two halves.One half was assigned to control subgroup 1,which was bonded with a single-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 1 in which the adhesive was applied three times before light curing.In group 2,the teeth were also hemisected into two halves.One half was assigned to control subgroup 2,which was bonded with the single-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 2 in which three layers of adhesive were applied with light curing each successive layer.Microtensile bond strength was immediately tested after specimen preparation.Results When the adhesive was applied three times before light curing,the bond strength of the experimental subgroup 1(n=33,57.49±11.61 MPa) was higher than that of the control subgroup 1(n=31,49.71±11.43 MPa,P<0.05).When using the technique of applying multiple layers of adhesive with light curing each successive layer,no difference of immediate bond strength was observed between the control subgroup 2 and the experimental subgroup 2(P>0.05).Conclusion Multiple coatings of one-step self-etching adhesive can increase the immediate bond strength to primary dentin when using the technique of light-curing after applying three layers of adhesive.
