[Effect of hot chemical etching on bond strength of zirconia to resin].
OBJECTIVE
This study aims to evaluate the influence of hot chemical etching on short- and long-term shear bond strength (SBS) of zirconia to resin.


METHODS
Eighty zirconia ceramic slices were obtained and randomly divided into five groups based on the surface treatment to be applied--group A: H2SO4/(NH4)2SO4 hot solution etching + application of Clearfil; group B: HF/HNO3 hot solution etching + application of Clearfil; group C: H2SO4/HF/HNO3 hot solution etching + Clearfil; group D: alumina sandblasting + application of Clearfil; group E: tribochemical silica coating + application of silane coupling agent. Eighty composite cylinders were bonded to pretreated ceramic slices using a bis-GMA-based resin cement. Specimens in each group were divided into two fractions: the first half received 24 h water storage, and the second half received 40 d water storage. Then, SBS tests were conducted. Morphological analysis of sandblasted alumina and hot chemical-etched zirconia surfaces were performed by scanning electron microscopy(SEM).


RESULTS
Group E displayed the highest SBS before artificial aging, and no statistical difference was found among the other groups. After 40 d water storage, groups A, B, and E showed significantly higher SBS than groups C and D. SBS increased significantly after artificial aging in groups A and B. No significant variations were found before and after artificial aging in the other groups.


CONCLUSIONS
The experimental hot chemical etching solution provides enhanced bonding for zirconia than sandblasting, and the bond strengths remain stable after artificial aging.
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
Wenyong
W
Dai
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
Houcai
H
Yin
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
Chen
C
Chen
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
Haifeng
H
Xie
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
Feimin
F
Zhang
D000537:Aluminum Oxide; D002516:Ceramics; D003188:Composite Resins; D001840:Dental Bonding; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D012822:Silicon Dioxide; D013499:Surface Properties; D015040:Zirconium
D003188:Composite Resins; D019279:Resin Cements; D012821:Silanes; D012822:Silicon Dioxide; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide