J Adv Prosthodont.
2015 Apr;7(2):108-114. 10.4047/jap.2015.7.2.108.
Evaluation of the bond strength between aged composite cores and luting agent
- Affiliations
-
- 1Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey. drserdarpolat@gmail.com
- 2Department of Restorative, Faculty of Dentistry, Abant Izzet Baysal University, Bolu, Turkey.
- 3Department of Prosthodontics, Faculty of Dentistry, Necmettin Erbakan University, Konya, Turkey.
- 4Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
- 5Department of Prosthodontics, Faculty of Dentistry, Bezmi Alem University, Istanbul, Turkey.
- KMID: 2118240
- DOI: http://doi.org/10.4047/jap.2015.7.2.108
Abstract
- PURPOSE
The aim of this study was to evaluate effect of different surface treatment methods on the bond strength between aged composite-resin core and luting agent.
MATERIALS AND METHODS
Seventy-five resin composites and also seventy-five zirconia ceramic discs were prepared. 60 composite samples were exposed to thermal aging (10,000 cycles, 5 to 55degrees C) and different surface treatment. All specimens were separated into 5 groups (n=15): 1) Intact specimens 2) Thermal aging-air polishing 3) Thermal aging- Er:YAG laser irradiation 4) Thermal aging- acid etching 5) Thermal-aging. All specimens were bonded to the zirconia discs with resin cement and fixed to universal testing machine and bond strength testing loaded to failure with a crosshead speed of 0.5 mm/min. The fractured surface was classified as adhesive failure, cohesive failure and adhesive-cohesive failure. The bond strength data was statistically compared by the Kruskal-Wallis method complemented by the Bonferroni correction Mann-Whitney U test. The probability level for statistical significance was set at alpha=.05.
RESULTS
Thermal aging and different surface treatment methods have significant effect on the bond strength between composite-resin cores and luting-agent (P<.05). The mean baseline bond strength values ranged between 7.07 +/- 2.11 and 26.05 +/- 6.53 N. The highest bond strength of 26.05 +/- 6.53 N was obtained with Group 3. Group 5 showed the lowest value of bond strength.
CONCLUSION
Appropriate surface treatment method should be applied to aged composite resin cores or aged-composites restorations should be replaced for the optimal bond strength and the clinical success.
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