Effect of Light-Activated Bleaching on the Microleakage of Class V Tooth-Colored Restorations Publisher Pubmed



Khoroushi M^{1, 3} ; Fardashtaki SR²
Source: Operative Dentistry Published:2009

Abstract

Objective: In-office bleaching procedures utilizing highly concentrated 30%-35% hydrogen peroxide solutions or hydrogen peroxide releasing agents are used for tooth whitening. Some recommend that, to enhance the whitening process, light-activation of the bleaching agent should be performed. The current study evaluated the effect of plasma arc bleaching on the microleakage of Class V restorations restored with resin composite, compomer and resin-modified glass ionomer (RMGI). Materials and Methods: The buccal surfaces of 72 freshly extracted premolars were prepared with Class V cavities (4 × 2.5 × 1.5 mm) extended 1 mm apical to the CEJ. The prepared teeth were randomly divided into six groups. The cavities were restored with Single Bond and Z100 resin composite (Groups 1 and 2), Prompt L-Pop and F2000 compomer (Groups 3 and 4) and Vitremer RMGI (Groups 5 and 6), respectively. They were then thermocycled for 500 cycles. The samples from Groups 1, 3 and 5 were incubated at 37°C and 100% humidity. Groups 2, 4 and 6 were bleached using in-office bleaching gel and the plasma arc bleaching unit, then incubated. All samples were sealed with nail varnish and immersed in 2% basic fuschin for 24 hours. The restorations were sectioned longitudinally and microleakage was evaluated using a scale ranging from 0 to 3. The data were analyzed using the Kruskal-Wallis test (α=0.05). Results: No statistically significant differences between study groups were observed in both the enamel and dentinal margins (p>0.05). Conclusion: Plasma arc bleaching did not significantly affect the microleakage of existing tooth-colored restorations restored with Z100 resin composite, F2000 compomer and Vitremer RMGI. © Operative Dentistry, 2009.