Evaporating solvents with a warm air-stream: Effects on adhesive layer properties and resin–dentin bond strengths

Klein-Júnior, Celso Afonso; Zander-Grande, Christiana; Amaral, Roberto; Stanislawczuk, Rodrigo; Garcia, Eugênio José; Baumhardt-Neto, Ricardo; Meier, Márcia Margarete; Loguercio, Alessandro Dourado; Reis, Alessandra

doi:10.1016/j.jdent.2008.04.014

« Previous Next »Journal of Dentistry
Volume 36, Issue 8 , Pages 618-625, August 2008

Evaporating solvents with a warm air-stream: Effects on adhesive layer properties and resin–dentin bond strengths

Celso Afonso Klein-Júnior
- School of Dentistry, Department of Dentistry, University Luterana do Brasil, Cachoeira do Sul, Rio Grande do Sul, Brazil
Christiana Zander-Grande
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
Roberto Amaral
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
Rodrigo Stanislawczuk
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
Eugênio José Garcia
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
Ricardo Baumhardt-Neto
- School of Chemistry, Department of Chemistry and Materials Science, University Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
Márcia Margarete Meier
- FGM Dental Products, Department of Research and Development, Joinville, Santa Catarina, Brazil
Alessandro Dourado Loguercio
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
Alessandra Reis
- School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil
- Corresponding author at: Universidade Estadual de Ponta Grossa, Mestrado em Odontolgia Rua Carlos Cavalcanti, 4748- Bloco M, Sala 64A - Uvaranas, 84030-900 Ponta Grossa, PR, Brazil. Tel.: +55 42 3220 3741; fax: +55 49 3551 2004.

Received 27 November 2007; received in revised form 6 April 2008; accepted 20 April 2008.

Summary

Objectives

This study evaluated the effect of a warm or cold air-dry stream for solvent evaporation on the microtensile resin–dentin bond strength (μTBS), nanoleakage pattern (SEM), degree of conversion (DC) and solvent evaporation rates (SE) of an ethanol/water- (Adper Single Bond, [SB] 3MESPE) and an acetone-based (Prime & Bond 2.1, [PB] Dentsply), two-step etch-and-rinse adhesive system.

Materials and methods

Adhesives were applied on demineralized dentin surfaces. For SE, a warm or cold air-dry stream (10s) was applied prior to light-activation (10s). Bonded sticks (0.8mm²) were tested in tension (0.5mm/min). Two bonded sticks from each tooth were immersed in a 50% (w/v) solution of silver nitrate (24h), photodeveloped (8h) and analyzed by SEM. The DC and solvent evaporation rate of the adhesives were evaluated under FTIR and analytical balance, respectively. Data were analyzed by two-way ANOVA and Tukey test (α=0.05).

Results

Higher μTBS and lower nanoleakage were observed when the SE step was performed with warm air-dry stream. However, the DC of the adhesives was not altered by the use of a warm air-dry.

Conclusions

The use of a warm air-dry stream seems to be a clinical tool to improve the bond strength and the quality of the hybrid layer (less nanoleakage infiltration), since it might reduce the number of pores within the adhesive layer.

Keywords: Adhesive systems, Bond strength, Solvent, Evaporation, Degree of conversion, Dentin