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Bonding Performance of Saliva Contaminated Monolithic Zirconia After Different Surface Treatments

Purpose: This research study investigated the effect of different surface treatments after saliva contamination for bonding performance of monolithic zirconia ceramic. Effect of contamination and cleaning methods on bonding of self-adhesive resin cements to zirconia ceramic were examined.

Materials and Methods: The 105 square shaped zirconia specimens were used and full sintered following the manufacturer’s instruction. All specimens were polished with silicon carbide paper. Specimens except from control groups were stored in artificial saliva for 1 minute at 37 ℃. Specimens were divided into 7 groups (n=15) based on surface treatment: 1- control group (without saliva contamination), 2- applied alumina-blast (AB), 3- applied air water spray, 4-cleaned with Ivoclean, 5-cleaned with pumice, 6- cleaned with isopropyl alcohol, 7- applied alumina-blast then cleaned with Ivoclean. Clearfil Ceramic Primer was applied to the all conditioned surfaces for 40 s before cementation as a universal primer. All specimens were cemented with self-adhesive resin-based luting agent (Panavia SA Cement Plus Automix). Thermal cycle aging was applied at 5000 cycles after cementation. The shear bond strength was measured using a universal testing machine at a crosshead speed of 0,5 mm/min. The fractured surfaces were observed using an stereomicroscope and scanning electron microscope. And surface elemental changing were observed with Energy Dispersive X-ray Spectroscope (EDS). The data were analysed by one-way ANOVA analysis.

Results: The averages of F Max (Mpa) values differ according to the groups (p<0,001). The bond strength of the groups is as follows: AB+ Ivoclean > AB> Ivoclean > pumice > air-water spray > control > alcohol

Conclusion: The use of cleaning agents can be easier and less time consuming than sandblasting restorations with complex surface geometry. Sandblasting and then applying Ivoclean may increase clinical success.






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