Water sorption and solubility of dentin bonding agents light-cured with different light sources

Fabre, Hebert Samuel Carafa; Fabre, Samuel; Cefaly, Daniela Francisca Gigo; Carrilho, Marcela Rocha de Oliveira; Garcia, Fernanda Cristina Pimentel; Wang, Linda

doi:10.1016/j.jdent.2006.09.002

« Previous Next »Journal of Dentistry
Volume 35, Issue 3 , Pages 253-258, March 2007

Water sorption and solubility of dentin bonding agents light-cured with different light sources

Hebert Samuel Carafa Fabre
- Department of Restorative Dentistry, University North of Paraná (UNOPAR), Londrina, PR, Brazil
Samuel Fabre
- Department of Statistics and Applied Mathematics, University of Londrina (UEL), Londrina, PR, Brazil
Daniela Francisca Gigo Cefaly
- Department of Restorative Dentistry, University North of Paraná (UNOPAR), Londrina, PR, Brazil
Marcela Rocha de Oliveira Carrilho
- Department of Restorative Dentistry, Dental Materials Division, Faculty of Dentistry of Piracicaba, University of Campinas (UNICAMP), Campinas, SP, Brazil
Fernanda Cristina Pimentel Garcia
- Department of Restorative Dentistry, University of Brasilia (UnB), Brasilia, DF, Brazil
Linda Wang
- Department of Restorative Dentistry, University North of Paraná (UNOPAR), Londrina, PR, Brazil
- Corresponding author at: Avenida Inglaterra, 770 Ap. 802, 86046-000 Londrina, PR, Brazil. Tel.: +55 43 3343 3523; fax: +55 43 3343 3523.

Received 28 June 2006; received in revised form 26 August 2006; accepted 2 September 2006.

Abstract

Objective

The aim of this study was to compare water sorption (WS) and solubility (WSB) of different dentin bonding agents (DBA) as regards classification and light-activation system. The null hypotheses were: (1) there is no difference among DBA with respect to water sorption and solubility; (2) there is no effect of light-curing source on water sorption and solubility of DBA.

Methods

The tested materials were: three-step etch-and-rinse (ScotchBond multi-purpose and Heliobond—control groups), two-step etch-and-rinse (Excite, Adper Single Bond, Adper Single Bond 2), self-etching (Adhse) and all-in-one (Xeno III) systems. For each material, six specimens were prepared (0.8mm×5.5mm) for each light-activation device: halogen lamp (control) or light-emitting diodes (LED). They were transferred to desiccators until a constant mass was obtained (m₁), subsequently immersed in deionized water until no alteration was obtained (m₂). Following, the specimens were reconditioned to constant mass in desiccators (m₃). The volume (V) of each specimen was calculated (mm³). WS and WSB were determined using the equations (m₂−m₃/V) and (m₃−m₁/V), respectively. Data were subjected to one-way analysis of variance and Tukey test (p<0.05). The influence of photo-activation units was analyzed by t-test.

Results

Higher values of WS and WSB were observed for the two-step etch-and-rinse and all-in-one systems. The employed light-activation unit also affected the tested characteristics. Thus, the anticipated null hypotheses were rejected.

Conclusions

Simplified systems were more susceptible to water adverse and they may become more prone to degradation over time regardless of the type of light-activation source.

Keywords: Dentin bonding agents, Water sorption, Solubility, Light-curing units