Effect of autoclave treatment on bonding strength of dental zirconia ceramics to resin cements

Abstract

The purpose of this study is to evaluate the bonding strengths between dental zirconia ceramics with surface treatments and resin cements. Two types of zirconia (NANOZR and Y-TZP) and six types of dental resin cements were used in this study. All zirconia specimens were treated as follows; sandblasted with alumina, annealed at 1100°C and stored in an autoclave at 134°C for 5 hours. Half of specimens after stored in the autoclave were dried in an oven at 150°C for 3 hours. Adhesive procedure of the zirconia and resin cements was undertaken according to each manufacturer's direction. Shear bonding strengths between zirconia and resin cements were measured. The bonding strengths stored in the autoclave were higher compared with dried after autoclave treatment. XPS revealed that hydroxide or H 2 O adsorbed on the outermost layer of the zirconia after autoclave treatment. It is extrapolated that adsorbed hydroxide enhanced the bonding reaction between zirconia and resin cement.

Effect of dopants and sintering temperature on microstructure and low temperature degradation of dental Y-TZP-zirconia

“…This is in conforming to the results of Tanaka and Ban. 81,82 Numerous authors have attempted to explain the mechanism of LTD. [13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32] Chevalier et al have described the kinetic of ageing of zirconia and have given together with Duong et al a mechanism which explains better the ageing process. [13][14][15][16][17][18]30 According to Chevalier ageing occurs by a slow surface transformation to the stable monoclinic phase in the presence of water or water vapor.…”

Influence of air-abrasion and subsequent heat treatment on bonding between zirconia framework material and indirect composites

“…However, this cannot be regarded as an influence on strength of bonds to indirect composites, because the coefficients of thermal expansion of the Estenia (20.7×10 −6 /°C) and Gradia (59.6×10 −6 /°C) 22) used in this study are significantly different from those of both monoclinic and tetragonal zirconia. Although the reason for this decrease in bond strength upon heat treatment remains unclear, it is probably due to a decrease in the adsorbed hydroxide on the zirconia surface after heat treatment 23) . With respect to comparison of two indirect composites, the Gradia composite was relatively higher bond strength than Estenia (Table 3).…”

The influence of grain size on low‐temperature degradation of dental zirconia

“…Dental zirconia ceramic, consisting of 3 mol % yttria stabilized tetragonal polycrystalline zirconia (Y‐TZP), has excellent mechanical, biomedical, aesthetic properties with its semitranslucent and radiopacity features 1–3. The development of CAD/CAM systems, the increase in aesthetic demand and, worries about metallic hypersensitivity have increased the application of Y‐TZP in dentistry.…”