Restorative Dentistry & Endodontics

George J. Eckert

1 Article

Effects of air-abrasion pressure on the resin bond strength to zirconia: a combined cyclic loading and thermocycling aging study: Eman Z. Al-Shehri, Afnan O. Al-Zain, Alaa H. Sabrah, Sarah S. Al-Angari, Laila Al Dehailan, George J. Eckert, Mutlu Özcan, Jeffrey A. Platt, Marco C. Bottino; Restor Dent Endod 2017;42(3):206-215. Published online June 5, 2017; DOI: https://doi.org/10.5395/rde.2017.42.3.206

Objectives

To determine the combined effect of fatigue cyclic loading and thermocycling (CLTC) on the shear bond strength (SBS) of a resin cement to zirconia surfaces that were previously air-abraded with aluminum oxide (Al₂O₃) particles at different pressures.

Materials and Methods

Seventy-two cuboid zirconia specimens were prepared and randomly assigned to 3 groups according to the air-abrasion pressures (1, 2, and 2.8 bar), and each group was further divided into 2 groups depending on aging parameters (n = 12). Panavia F 2.0 was placed on pre-conditioned zirconia surfaces, and SBS testing was performed either after 24 hours or 10,000 fatigue cycles (cyclic loading) and 5,000 thermocycles. Non-contact profilometry was used to measure surface roughness. Failure modes were evaluated under optical and scanning electron microscopy. The data were analyzed using 2-way analysis of variance and χ² tests (α = 0.05).

Results

The 2.8 bar group showed significantly higher surface roughness compared to the 1 bar group (p < 0.05). The interaction between pressure and time/cycling was not significant on SBS, and pressure did not have a significant effect either. SBS was significantly higher (p = 0.006) for 24 hours storage compared to CLTC. The 2 bar-CLTC group presented significantly higher percentage of pre-test failure during fatigue compared to the other groups. Mixed-failure mode was more frequent than adhesive failure.

Conclusions

CLTC significantly decreased the SBS values regardless of the air-abrasion pressure used.

Citations

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