Effect of polydopamine on bonding strength of zirconia and study on aging test

ZHANG Jing; WU Jie; WANG Lu; ZHOU Jing; ZHANG Zhao

doi:10.13820/j.cnki.gdyx.20233745

Abstract：Objective To explore the effect of Polydopamine(PDA)compound coating on the bonding strength of zirconia and self-bonding resin cement 3M ESPE Rely XTM U200 and the change of bonding strength after aging test.Methods Zirconia specimens were treated with three different surface treatments:"sandblasting,""sandblasting+si-lanization,"and"sandblasting+PDA composite coating."These treated zirconia specimens were then bonded to resin blocks using 3M U200.The samples were divided into three groups for immediate shear bond strength testing,thermocy-cling aging,and pH cycling aging followed by shear bond strength testing.Statistical analysis was performed on the bond-ing strength data of each group.Results The"sandblasting+silanization"group showed the highest bonding strength between zirconia and resin,with statistically significant differences(P＜0.05).The"sandblasting+PDA composite coating"group had slightly higher bonding strength than the"sandblasting"group,but the difference was not statistically significant(P＞0.05).After aging tests,all surface treatment groups experienced a significant reduction in bonding strength(P＜0.05).The"sandblasting+PDA composite coating"group exhibited the greatest decrease in bonding strength,which was statistically significant(P＜0.05).The decrease in bonding strength for the"sandblasting+si-lanization"group was slightly higher than that of the"sandblasting"group,but the difference was not statistically signifi-cant(P＞0.05).Conclusion The PDA composite coating did not effectively enhance the bonding strength between zir-conia and resin cement.Its bonding strength and stability after aging were inferior to those of the silanization coating.