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KMID : 1034420170420030206
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Restorative Dentistry & Endodontics
2017 Volume.42 No. 3 p.206 ~ p.215
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Effects of air-abrasion pressure on the resin bond strength to zirconia: a combined cyclic loading and thermocycling aging study
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Al Shehri Eman Z.
Al Zain Afnan O.
Sabrah Alaa H.
Al Angari Sarah S.
Al Dehailan Laila
Eckert George J.
Platt Jeffrey A.
Ozcan Mutlu
Bottino Marco C.
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Abstract
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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.
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KEYWORD
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Air-abrasion, Bond strength, Fatigue, Panavia F 2.0, Resin cement, Thermocycling
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