The effect of silica-coating by sol-gel process on resin-zirconia bonding.
The effect of silica-coating by sol-gel process on the bond strength of resin composite to zirconia was evaluated and compared against the sandblasting method. Four groups of zirconia samples were silica-coated by sol-gel process under varied reagent ratios of ethanol, water, ammonia and tetraethyl orthosilicate and for different deposition times. One control group of zirconia samples were treated with sandblasting. Within each of these five groups, one subgroup of samples was kept in dry storage while another subgroup was aged by thermocycling for 6,000 times. Besides shear bond testing, the surface topography and surface elemental composition of silica-coated zirconia samples were also examined using scanning electron microscopy and X-ray photoelectron spectroscopy. Comparison of silica coating methods revealed significant differences in bond strength among the Dry groups (p<0.001) and Thermocycled groups (p<0.001). Comparison of sol-gel deposition times also revealed significant differences in bond strength among the Dry groups (p<0.01) and Thermocycled groups (p<0.001). Highest bond strengths were obtained after 141-h deposition: Dry (7.97±3.72 MPa); Thermocycled (2.33±0.79 MPa). It was concluded that silica-coating of zirconia by sol-gel process resulted in weaker resin bonding than by sandblasting.
Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, PR China. yklung@graduate.hku.hk
Christie Ying Kei
CY
Lung
Edwin
E
Kukk
Jukka Pekka
JP
Matinlinna
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D056951:Photoelectron Spectroscopy; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
D003188:Composite Resins; D003764:Dental Materials; D012821:Silanes; D012822:Silicon Dioxide; D015040:Zirconium