Effect of prolonged application times on the durability of resin–dentin bonds

Reis, Alessandra; de Carvalho Cardoso, Paula; Vieira, Luiz Clovis Cardoso; Baratieri, Luiz Narciso; Grande, Rosa Helena Miranda; Loguercio, Alessandro D.

doi:10.1016/j.dental.2007.06.027

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Volume 24, Issue 5 , Pages 639-644, May 2008

Effect of prolonged application times on the durability of resin–dentin bonds

Alessandra Reis
- Department of Dental Materials and Operative Dentistry, University of Oeste de Santa Catarina, Joaçaba, SC, Brazil
- Corresponding author at: Universidade do Oeste de Santa Catarina, Campus Joaçaba, R. Getúlio Vargas, 2125 Bairro Flor da Serra, CEP 89600-000, Joaçaba, SC, Brazil. Tel.: +55 49 551 2000; fax: +55 49 551 2000.
Paula de Carvalho Cardoso
- Department of Operative Dentistry, University Federal of Santa Catarina (UFSC), SC, Brazil
Luiz Clovis Cardoso Vieira
- Department of Operative Dentistry, University Federal de Santa Catarina, Florianópolis, SC, Brazil
Luiz Narciso Baratieri
- Department of Operative Dentistry, University Federal de Santa Catarina, Florianópolis, SC, Brazil
Rosa Helena Miranda Grande
- Department of Dental Materials, University of São Paulo, São Paulo, SP, Brazil
Alessandro D. Loguercio
- Department of Dental Materials and Operative Dentistry, University of Oeste de Santa Catarina, Joaçaba, SC, Brazil

Received 29 November 2006; accepted 6 June 2007.

Abstract

Objectives

To examine the effect of prolonged application time on the early and 3-year resin–dentin microtensile bond strength.

Methods

Water/ethanol (Single Bond [SB]) and acetone-based systems (One Step [OS]) were employed. A flat superficial dentin surface was exposed in third human molars by wet abrasion. The adhesives were applied to a delimited area of 52mm² on wet surfaces, for 40, 90, 150 and 300s. Four teeth were assigned for each experimental condition. Composite build-ups were constructed incrementally. After water storage at 37°C for 24h, teeth were sectioned to obtain sticks with cross-sectional areas of 0.8mm² to be tested in tension (0.5mm/min) either immediately (IM) or after 3 years (3Y) of water storage. The microtensile bond strength (μTBS) values were analyzed by two way repeated measures ANOVA and Tukey's test (α=0.05).

Results

The 90- and 150-s groups achieved the highest IM μTBS for OS (p<0.01). For SB, the highest IM μTBS values were observed after 300-s application (p<0.01). Significant decreases in μTBS were observed for OS in the 40- and 90-s groups after 3Y, except for the 150-s group. With regard to SB, after 3Y significant drops in μTBS values were observed for the 40- and 150-s groups, except for the 300-s group.

Significance

Prolonged application times can increase the immediate μTBS of two-step etch-and-rinse adhesive systems and make the adhesive layer more stable over time.

Keywords: Adhesive, Dentin, Bond strength, Application, Solvent