[Effect of nano-silica coating on bonding strength of zirconia ceramics to dentin].
OBJECTIVE
To investigate the effect of silica coating by sol-gel process on bonding strength of zirconia ceramics to dentin.


METHODS
Blocks of sintered zirconia ceramics were cut and randomly divided into 4 groups,16 slices in each group. Each group was subject to one of the 4 kinds of surface treatment (control group, sandblasting, sandblasting +silicone, sandblasting + silica coating + silicone) and then bonded to dentin with resin cement. After preservation in 37 degrees centigrade distilled water for 24 hours, the shear bonding strength of these specimens was tested and the data was analyzed with SAS6.12 software package for analysis of variance. The surface modality of the ceramics was observed under scanning electron microscopy (SEM).


RESULTS
The group of sandblasting+ silica coating + silicone attained the highest shear bonding strength, which was significantly different from the other groups(P=0.000);There was no significant difference between the sandblasting and sandblasting + silicone group (P=0.827), which was significantly different from the control group(P=0.001).


CONCLUSIONS
Silica coating by sol-gel process, coupled with silicone, can significantly increase the bonding strength of zirconia ceramics to dentin.
Zhang
Xian-Fang
XF
Department of Prosthodontics, Dental Center of Xuhui District, Shanghai 200032, China. zxf0524@163.com
Zheng
Hu
H
Han
Dong-Wei
DW
D002516:Ceramics; D001840:Dental Bonding; D003804:Dentin; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D012822:Silicon Dioxide; D013499:Surface Properties; D014867:Water; D015040:Zirconium
D019279:Resin Cements; D014867:Water; D012822:Silicon Dioxide; D015040:Zirconium; C028541:zirconium oxide