Evaluation of the bond strength and characteristics of zirconia after different surface treatments
Available online 21 June 2018
Abstract
Statement of problem
Non-thermal plasma treatment could increase the bond strength of resin cements to zirconia, but studies are lacking.
Purpose
The
purpose of this in vitro study was to evaluate zirconia bond strength,
surface roughness, and contact angle and to measure the infrared
spectrum after different surface treatments.
Material and methods
Yttria-tetragonal
zirconia polycrystal (Y-TZP; n=9) blocks were sectioned into 36 slices
(12×11×3 mm) and divided (n=4) into surface treatment groups as follows:
2 control groups, consisting of airborne-particle abrasion plus primer
(APP) and 10% hydrofluoric acid etching plus primer (HFP), and 3
experimental groups consisting of a nonthermal plasma (NP) application; a
nonthermal plasma plus primer application (NPP); and a 10% hydrofluoric
acid etching plus nonthermal plasma plus primer (HFNPP) application.
Each zirconia disk was cemented to a prepolymerized resin block. After
cementation, the specimens were sectioned for microtensile strength
testing and for surface roughness analysis and contact angle analysis.
Results were submitted to analysis of variance and Tukey tests (α=.05).
Results
Results
showed no statistically significant differences between the APP and
HFNPP groups, but these 2 groups showed statistically better bonding
than those of HFP, NP, and NPP.
Conclusions
Airborne-particle
abrasion resulted in a significant increase in surface roughness
compared with the other groups. After nonthermal plasma treatment, the
contact angle of the zirconia surface decreased within 48 hours.
Nonthermal plasma application for surface treatment of zirconia showed
no significant difference in bond strength when compared with
airborne-particle abrasion.
Comments