Effect of light-activated bleaching on the microleakage of Class V tooth-colored restorations.

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 x 2.5 x 1.5 mm) extended 1 mm apical to the CEJ. The prepared teethwere 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 degrees 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 (alpha = 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.

• Authors: Maryam Khoroushi, Saleh Reisian Fardashtaki
• Journal: Operative dentistry (Oper Dent) 2009 Sep-Oct Vol. 34 Issue 5 Pg. 565-70 ISSN: 0361-7734 [Print] United States
• PMID: 19830971 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Compomers
• Composite Resins
• Glass Ionomer Cements
• Oxidants
• Hydrogen Peroxide

Topics

• Bicuspid
• Compomers (radiation effects)
• Composite Resins (radiation effects)
• Dental Cavity Preparation (classification)
• Dental Leakage (etiology)
• Dental Restoration, Permanent (classification, methods)
• Glass Ionomer Cements (radiation effects)
• Humans
• Hydrogen Peroxide
• Light (adverse effects)
• Oxidants
• Photochemical Processes
• Tooth Bleaching (adverse effects, methods)