Effect of Post-Contamination Surface Treatment on the Bond Strength of Adhesively Bonded Ceramic Indirect Restorations
Uniformed Services University of the Health Sciences Bethesda United States
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Purpose The purpose of this research was to determine the effects of contamination, different cleaning methods, specifically Ivoclean, and simulated aging on the shear bond strength SBS of resin cement to 2 different ceramic materials, zirconia and lithium disilicate. Materials and Methods Blocks of lithium disilicate and zirconia were prepared for bonding by hydrofluoric acid and particle abrasion respectively. The samples were divided into 3 groups for each type of ceramic, Ivoclean pilot study, 24 hour storage group, and the thermocycled group. The Ivoclean pilot study consisted of 10 uncontaminated samples and 10 uncontaminated Ivoclean treated samples for both ceramics. The 24 hour stored and thermocycled groups were broken down to 5 subgroups saliva uncontaminated, contaminated, Ivoclean, phosphoric acid lithium disilicate or air abrasion zirconia, and airwater spray, with each subgroup containing 10 samples. The samples were tested on an universal testing machine to determine the SBS. Results The SBS of uncontaminated samples treated with Ivoclean was not statistically different from the uncontaminated control samples. The 24 hour stored samples were not significantly different from each other, except for the contaminated samples, which weresignificantly lower than uncontaminated. The thermocycled groups showed somewhat more difference. A significant number of samples debonded. Interestingly, all of the Ivoclean treated zirconia samples debonded and SBS could not be recorded. Lithium disilicate uncontaminated controls and the phosphoric acid cleaned samples were statistically similar. The thermocycled uncontaminated control and air abraded samples proved to be statistically similar. Conclusions Saliva contamination and simulated aging thermocycling decreased bond strengths independently from each other and compounded one another. Cleaning methods generally did not return bond strengths to that of the uncontaminated samples.
- Ceramics, Refractories and Glass
- Adhesives, Seals and Binders