氩气源低温常压等离子体改善牙本质⁃自酸蚀粘接界面粘接效果的体外研究

In vitro study on nonthermal argon atmospheric plasma improving the bonding interface between dentin and self⁃etch adhesive

目的探讨氩气源低温常压等离子体(nonthermal argonatmos phericpressure plasma,NTAPP)射流处理不同时间对牙本质⁃自酸蚀粘接剂粘接界面粘接强度及牙本质润湿性的影响。方法使用NTAPP发生装置(放电输入功率:9 W,氩气气体流量:5 L/min),分别处理5组(n=6)人牙本质试件(0、5、10、15、20 s)后,使用S3 Bond粘接剂处理牙面,制作微拉伸粘接试件并测量各组即刻粘接强度。同样参数、同样分组条件下处理牙本质面后测量牙本质表面接触角。结果随着NTAPP处理时间延长,牙本质即刻粘接强度呈显著上升趋势,以处理15 s组粘接强度最高(31.82±2.80)MPa。随着NTAPP处理时间延长,与阴性对照组牙本质表面接触角(75.57°±1.45°)相比,各实验组牙本质表面接触角均显著减小,以处理15 s组牙本质表面接触角(33.56°±2.14°)最低,湿润性最大。结论NTAPP处理可显著增加牙本质表面湿润性,提高与自酸蚀粘接剂粘接界面的粘接强度,这与处理时间相关。

Objective To study the effect of nonthermal argon atmospheric pressure plasma(NTAPP)treatment on the bonding strength between dentine and selfetch adhesive and the wettability of dentine surfaces under different treatment times.Methods The plasma jet was operated at an input power of 9 W.Argon was used as the operating gas at a flow rate of 5 L/min.The dentin surface was exposed to the plasma jet(n=6)for various times(0,5,10,15,20 s).After a onestep selfetch adhesive(S3 Bond)was applied to the treated dentine surface,microtensile bonding specimens were made,and the microtensile bonding strength was tested.Then,the dentine surface contact angles were measured after NTAPP treatment for 5,10,15,and 20 s with the same gas flow rate and input power described above.Results Along with the NTAPP treatment time,the dentin immediate bonding strength was significantly increased.The 15 s group showed significantly elevated bonding strength(31.82±2.80 MPa)in contrast to the other groups.The contact angles of each experimental group significantly decreased compared with the contact angles of the negative control group(75.57°±1.45°).The contact angles decreased the most to 33.56°±2.14°with NTAPP treatment for 15 s,and its wettability was the highest.Conclusion NTAPP treatment can significantly increase the wettability of the dentin surface and improve the adhesive strength of the adhesive interface with selfetching adhesive,which is also related to the treatment time.