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  • Title: Bonding quality of contemporary dental cements to sandblasted esthetic crown copings.
    Author: Abdelaziz KM, Al-Qahtani NM, Al-Shehri AS, Abdelmoneam AM.
    Journal: J Investig Clin Dent; 2012 May; 3(2):142-7. PubMed ID: 22522951.
    Abstract:
    AIM: To evaluate the shear bond strength of current luting cements to sandblasted crown-coping substrates. METHODS: Specimens of nickel-chromium, pressable glass ceramic, and zirconia crown-coping substrates were sandblasted in three groups (n = 30 each) with 50 (group 1), 110 (group 2), and 250 μm (group 3) alumina particles at a pressure of 250 kPa. Cylinders of glass ionomer, universal resin, and self-adhesive resin cements were then built up on the sandblasted substrate surfaces of each group (n = 10). All bonded specimens were stressed to evaluate the cement-substrate shear bond strength. Both the mode and incidence of bond failure were also considered. RESULTS: No difference was noticed between all test groups in terms of cement-substrate bond strength. In comparison to self-adhesive type, the universal resin cement provided lower bond strengths to both metal and glass-ceramic substrates in group 1. The self-adhesive resin cement provided the highest bond strengths to the zirconia substrates in groups 2 and 3. The adhesive type of bond failure was common in the metal and zirconia substrates in all groups. CONCLUSIONS: Cement-substrate bonding quality is not affected by the size of sandblasting particles. Resin cements bond better to different coping substrates. Self-adhesive resin cement is the best choice to bond zirconia-based substrates.
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