Abstract
The purpose of this study was to evaluate the effect of non-thermal atmospheric pressure plasma (NTP) on shear bond strength (SBS) between yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and self-adhesive resin cement. For this study, surface energy (SE) was calculated with cube-shaped Y-TZP specimens, and SBS was measured on disc-shaped Y-TZP specimens bonded with G-CEM LinkAce or RelyX U200 resin cylinder. The Y-TZP specimens were classified into four groups according to the surface treatment as follows: Control (no surface treatment), NTP, Sb (Sandblasting), and Sb + NTP. The results showed that the SE was significantly higher in the NTP group than in the Control group (p < 0.05). For the SBS test, in non-thermocycling, the NTP group of both self-adhesive resin cements showed significantly higher SBS than the Control group (p < 0.05). However, regardless of the cement type in thermocycling, there was no significant increase in the SBS between the Control and NTP groups. Comparing the two cements, regardless of thermocycling, the NTP group of G-CEM LinkAce showed significantly higher SBS than that of RelyX U200 (p < 0.05). Our study suggests that NTP increases the SE. Furthermore, NTP increases the initial SBS, which is higher when using G-CEM LinkAce than when using RelyX U200.
Highlights
Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is one of the most widely used restorative materials along with Computer-Aided Design and Computer-Aided Manufacturing (CAD-CAM)development in the dental field [1]
The surface treatments applied to the yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) specimens are as follows: No surface treatment (Control), non-thermal atmospheric pressure plasma treatment (NTP), sandblasting (Sb), sandblasting followed by non-thermal atmospheric pressure plasma treatment (Sb + NTP)
We suggest that NTP treatment probably helps to increase the initial shear bond strength (SBS)
Summary
Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is one of the most widely used restorative materials along with Computer-Aided Design and Computer-Aided Manufacturing (CAD-CAM)development in the dental field [1]. Y-TZP is known as a biocompatible ceramic with outstanding aesthetics, low thermal conductivity, and chemical stability [2,3]. Y-TZP has superior compressive and flexural strength as compared with glass and feldspar ceramics [4]. In the case of conventional ceramics, micromechanical retention with hydrofluoric acid and chemical bonding through silane coupling agents increase bonding strength with resin cement [5,6]. These methods are usually considered not efficient for Y-TZP because of its high corrosion resistance due to the polycrystalline structure containing little silica [7,8,9]. In order to overcome this drawback, a combination of surface roughening by sandblasting and chemical adhesion using
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