Effects of air-abrasion pressure on the resin bond strength to zirconia: a combined cyclic loading and thermocycling aging study
Restorative Dentistry & Endodontics
;
: 206-215, 2017.
Article
in English
| WPRIM
| ID: wpr-23636
ABSTRACT
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 ANDMETHODS:
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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Aging
/
Microscopy, Electron, Scanning
/
Adhesives
/
Resin Cements
/
Fatigue
/
Aluminum Oxide
Language:
English
Journal:
Restorative Dentistry & Endodontics
Year:
2017
Type:
Article
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