Original scientific paper

Influence of Antioxidant Agents on the Marginal Seal of Class V Restorations

Ana Isabella Arruda MEIRA RIBEIRO ; School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil
Gymenna Maria Tenório GUÊNES ; School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil
Darlene Cristina Ramos Eloy DANTAS ; School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil
José Wrban Garcia da SILVA ; Undergraduate student, School of Dentistry, State University of Paraiba, Campina Grande, PB, Brazil
Alessandro Leite CAVALCANTI orcid.org/0000-0003-3572-3332 ; School of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil
Rodivan BRAZ ; Faculty of Dentistry, University of Pernambuco, Camaragibe, PE, Brazil

Abstract

Objective: To evaluate in vitro the effect of the application of the antioxidant agent 10% sodium ascorbate to deproteinized dentin on the marginal seal of composite resin restorations. Methods: Thirty extracted human third molars were selected and had class V cavities prepared on the buccal and lingual surfaces. The 60 cavities were randomly assigned to 6 groups of 10 specimens each. In G1, only 37% phosphoric acid was applied to dentin for 15 s (demineralization); In G2, after demineralization, 10% sodium hypochlorite was applied for 60 s (deproteinization); In G3-G6, after
demineralization and deproteinization, the antioxidant agent 10% sodium ascorbate was applied for 15 s, 30 s, 1 min and 10 min, respectively. An etch-and-rinse adhesive system (Adper Single Bond 2; 3M/ESPE) was applied and all cavities were restored with composite resin (Filtek Z250; 3M/ESPE). After storage in distilled water at 37°C for 24 h, the specimens were subjected to a thermal cycling regimen (500 cycles) and immersed in 2% methylene blue for 24 h. The specimens were then sectioned in a buccolingual direction and the occurrence of marginal microleakage at the dentin/resin interface was assessed. Results: There was statistically significant difference between G2 x G6 (p=0.002) and G3 x G6 (p=0.007). No statistically significant difference (p=0.300) was found regarding microleakage between the deproteinized and the non-deproteinized groups. However, comparing the mean microleakage values obtained in the groups that received application of the antioxidant agent, significant difference was found between G2 and the other groups (p=0.018). Conclusion: The application of 10% sodium ascorbate after deproteinization of dentin substrate promoted a better marginal seal of class V restorations, although precipitation of this antioxidant agent occurred on dentin surface.

Keywords

Dental Leakage; Dentin; Dental Restoration Failure; Composite Resins

Hrčak ID:

62083

URI

https://hrcak.srce.hr/62083

Publication date:

15.12.2010.

Article data in other languages: croatian

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