摘要
目的探讨氯己定质量浓度对牙本质与树脂粘接耐久性的影响，为进一步选择最佳质量浓度的氯己定应用于临床粘接提供参考。方法40颗第三磨牙通过随机数字表法分为5组，1组用1．5μl纯水处理牙本质表面（对照组），其余4组分别用0．02％、0．2％、2％、20％氯己定处理牙本质表面（氯己定组），每组制作32个微拉伸试件，分别经24h和6个月37℃纯水储存后测试粘接强度；并用扫描电镜观察断裂界面。结果氯己定处理对水储存24h牙本质与树脂粘接强度的影响较小。水储存6个月后，0．2％和2％氯己定组的粘接强度[分别为（24．68±5．26）和（23．19±5．26）MPa]与对照组[（19．10±4．67）MPa]相比，差异有统计学意义（P=0．007，0．045）；0．2％、2％氯己定组的粘接强度与0．02％氯己定组[（19．01±6．87）MPa]相比，差异有统计学意义（P=0．006，0．041）。水储存24h时试件断裂多为界面破坏和混合破坏，水储存6个月后混合破坏和内聚破坏增加。水储存6个月后0．2％、2％和20％氯己定组界面断裂多发生于混合层顶部（近粘接树脂端）；而对照组和0．02％氯己定组断裂多发生于混合层底部（近牙本质端）。结论氯己定处理牙本质表面可以提高牙本质与树脂的粘接耐久性；氯己定质量浓度超过0．2％后，增加质量浓度未能进一步提高粘接耐久性。
Objective To evaluate the effect of concentration of chlorhexidine on bonding durability of dentine and resin. Methods Forty extracted third molars were randomly allocated into five groups, which include one control group and four test groups. Teeth dentin surfaces in each group were treated with one of the following solution, 1.5 μl water（control） , 0. 02% , 0. 2% , 2% and 20% chlorhexidine. Single Bond 2 adhesive was applied to the dentin surface according to manufacturer＇s recommendations. Then 5 mm thickness of composite （Z250） was built up on the dentin of each molar. The teeth were sectioned into microtensile samples and subdivided into two subgroups, 16 samples each. Samples in subgroup Ⅱ and Ⅰ were tested after being stored in distilled water for 24 h and 6 month respectively. Each fractured sample was examined with SEM. Results No significant differences of 24 h bonding strength were found among the five groups. There were significant difference in bonding strength between 0. 2%, 2% chlorhexidine groups [ （24. 68 ±5.26） and （23.19 ±5.26） MPa] and the control group[ （ 19. 10 ±4. 67） MPa] after 6 month （P = 0. 007, 0. 045 ）, and significant differences were also found between 0. 2%, 2% and 0. 02% chlorhexidine group[ （ 19. 01 ± 6.87 ） MPa, P = 0. 006,0.041 ）. Most of the fractured modes were mixed or interface failures after 24 h of water storage, and the mixed failure increased after six month of water storage. In the 0. 2%, 2% and 20% chlorhexidine treated group, most of the failure was found at the top of hybrid layer, while in the 0. 02% group, it was found in the base part of hybrid layer. Conclusions Chlorhexidine could increase the bonding durability of resin and dentine. Higher than 0. 2% , concentration of chlorhexidine couldn＇t improve bonding durability.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2010年第2期94-97,共4页
Chinese Journal of Stomatology
关键词
牙本质
氯己定
拉伸强度
粘接
Dentin
Chlorhexidine
Tensile strength
Bond
