JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE B 2016 Vol.17 No.9 P.703-711

Effects of light curing modes and ethanol-wet bonding on dentin bonding properties

Author(s): Mu-zi Li, Jin-rui Wang, Hong Liu, Xia Wang, Kang Gan, Xiu-ju Liu, De-li Niu, Xiao-qing Song
Affiliation(s): School and Hospital of Stomatology, Jilin University, Changchun 130021, China; more
Corresponding email(s): jdliuhong@163.com
Key Words: Light curing mode, Soft-start, Ethanol-wet bonding, Scanning electron microscopy (SEM), Bonding strength

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Abstract: Objective: This study explored the effects of different light curing modes and ethanol-wet bonding on dentin bonding strength and durability. Methods: A total of 54 molars were randomly divided into three groups: Single Bond 2, Gluma Comfort Bond, and N-Bond. Based on the three light-curing modes and presence or absence of ethanol pretreatment, the samples were assigned to six subgroups: high-light mode, ethanol pretreatment+high-light mode, soft-start mode, ethanol pretreatment+soft-start mode, standard mode, and ethanol pretreatment+standard mode. All samples were bonded with resin based on the experimental groups. After 24 h and 6 months of water storage, a universal testing machine was used to measure microtensile bond strength. scanning electron microscopy (SEM) was applied to observe mixed layer morphology. Results: The 24-h and 6-month microtensile bond strengths of the ethanol pretreatment groups were significantly higher than those of the non-ethanol pretreatment groups at the same light modes (P<0.05). With or without ethanol pretreatment, the microtensile bond strengths of the high-light modes were significantly lower than those of the soft-start modes and standard modes (P<0.05). The microtensile bond strengths of samples from the 6-month water storage group significantly decreased compared with those of samples from the 24-h water storage group (P<0.05). The soft-start groups and standard groups formed better mixed layers than the high-light mode groups, whereas the ethanol pretreatment groups formed more uniform mixed layers than those without ethanol pretreatment. Conclusions: ethanol-wet bonding technique, soft-start, and standard modes could improve dentin bonding properties.

不同光固化模式和乙醇湿粘接对牙本质粘结性能的影响

目的：探究不同光固化模式和乙醇湿粘接对牙本质粘结强度及耐久性的影响，为临床应用提供理论指导。
创新点：率先将乙醇湿粘接技术和不同光固化模式有机结合，成功筛选出了提高牙本质粘结性能的有效策略。
方法：将Single Bond 2（SB）组、Gluma Comfort Bond（GB）组和N-Bond（NB）组分别分为6个亚组：高光照射模式、乙醇预处理+高光照射模式、软启动照射模式、乙醇预处理+软启动照射模式、标准照射模式和乙醇预处理+标准照射模式。按照分组粘结，水储24小时和6个月后，应用万能测试机分别检测微拉伸强度，体视显微镜观察微拉伸试件断裂类型和扫描电镜观察混合层形态。
结论：乙醇湿粘接技术可以改善混合层质量，从而提高其粘结强度和改善粘结耐久性；软启动光照模式和标准光照模式可以形成更好的混合层质量，获得更高的牙本质粘结强度和更好的粘结耐久性。

关键词：光照模式；软启动；乙醇湿粘接；粘结强度；扫描电子显微术

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