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
This study was designed to solve the problem of large waste volume from bamboo processing residues in recent years.Using magnesium oxychloride(MO)cementitious material as the main material and bamboo residue(BR)as the...This study was designed to solve the problem of large waste volume from bamboo processing residues in recent years.Using magnesium oxychloride(MO)cementitious material as the main material and bamboo residue(BR)as the reinforcing material,a BR/MO composite material was prepared.The effects of BR amount on the molding properties,mechanical strength,and water resistance of BR/MO composites were examined and discussed.Scanning electron microscopy(SEM),X-ray diffractometry(XRD),and thermogravimetric analysis were used to characterize composite microscopic morphology,crystalline structure,and heat resistance.The results showed that,when the BR content was 1.00%(by wt),the flowability of MO paste was beneficial to composite molding.Composite mechanical properties and water resistance were greatly affected by BR addition.When the BR content was 1.00%,composite compressive and bending strengths and softening coefficient all reached maximum values.Meanwhile,increases in water absorption by 24 h and decreases of contact angle were small.These results suggested that,when the BR content was 1.00%,composite mechanical properties and water resistance were the best and the mechanical strength also improved with extended composite storage time.SEM analysis indicated that BR played the role of a reinforcing phase in MO matrices.However,when the BR content exceeded 1.00%,interfacial bonding between BR and MO became less.XRD analysis showed that,with 1.00%BR content,composites showed more 5-phase crystals with high strength.This further explained the reason why this composite’s mechanical properties were the best and the heat resistance not deteriorated due to BR,which was easily decomposed.展开更多
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。
基金supported by the National Natural Science Foundation of China(31971743)Forestry Science and Technology Innovation Outstanding Youth Scientific Research Project of Hunan Province,China(XLK201945)+2 种基金Natural Science Foundation of Hunan Province,China(2019JJ40540)Hunan Provincial Technical Innovation Platform and Talent Program in Science and Technology,China(2019RS2040)National College Students Innovation and Entrepreneurship Training Program in China(S202010538013).
文摘This study was designed to solve the problem of large waste volume from bamboo processing residues in recent years.Using magnesium oxychloride(MO)cementitious material as the main material and bamboo residue(BR)as the reinforcing material,a BR/MO composite material was prepared.The effects of BR amount on the molding properties,mechanical strength,and water resistance of BR/MO composites were examined and discussed.Scanning electron microscopy(SEM),X-ray diffractometry(XRD),and thermogravimetric analysis were used to characterize composite microscopic morphology,crystalline structure,and heat resistance.The results showed that,when the BR content was 1.00%(by wt),the flowability of MO paste was beneficial to composite molding.Composite mechanical properties and water resistance were greatly affected by BR addition.When the BR content was 1.00%,composite compressive and bending strengths and softening coefficient all reached maximum values.Meanwhile,increases in water absorption by 24 h and decreases of contact angle were small.These results suggested that,when the BR content was 1.00%,composite mechanical properties and water resistance were the best and the mechanical strength also improved with extended composite storage time.SEM analysis indicated that BR played the role of a reinforcing phase in MO matrices.However,when the BR content exceeded 1.00%,interfacial bonding between BR and MO became less.XRD analysis showed that,with 1.00%BR content,composites showed more 5-phase crystals with high strength.This further explained the reason why this composite’s mechanical properties were the best and the heat resistance not deteriorated due to BR,which was easily decomposed.
