Differential bonds degradation of two resin-modified glass-ionomer cements in primary and permanent teeth

Marquezan, Marcela; Fagundes, Ticiane Cestari; Toledano, Manuel; de Lima Navarro, Maria Fidela; Osorio, Raquel

doi:10.1016/j.jdent.2009.06.018

« Previous Next »Journal of Dentistry
Volume 37, Issue 11 , Pages 857-864, November 2009

Differential bonds degradation of two resin-modified glass-ionomer cements in primary and permanent teeth

Marcela Marquezan
- Departament of Orthodontics and Pediatric Dentistry, Universidade de São Paulo - USP; Avenida Professor Lineu prestes, 2227, Cidade Universitária, São Paulo - SP, Brazil
Ticiane Cestari Fagundes
- Department of Dental Materials, Endodontics and Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Brazil; Alameda Dr.Octávio Pinheiro Brisolla, 9-75, Vila Universitária, Bauru, SP - Brazil
Manuel Toledano
- Department of Dental Materials, School of Dentistry, University of Granada Colegio Máximo. Campus de Cartuja s/n, Granada, Spain E-18071
Maria Fidela de Lima Navarro
- Department of Dental Materials, Endodontics and Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Brazil; Alameda Dr.Octávio Pinheiro Brisolla, 9-75, Vila Universitária, Bauru, SP - Brazil
Raquel Osorio
- Department of Dental Materials, School of Dentistry, University of Granada Colegio Máximo. Campus de Cartuja s/n, Granada, Spain E-18071
- Corresponding author. Tel.: +34 958 243788.

Received 12 May 2009; received in revised form 18 June 2009; accepted 26 June 2009. published online 06 July 2009.

Abstract

Objectives

To evaluate the effect of chemical degradation on bond strength of resin-modified glass-ionomer cements bonded to primary and permanent dentin.

Methods

Class I cavities of permanent and primary extracted human molars were restored with two resin-modified glass-ionomer cements: Fuji II LC and Vitremer, and stored in water for 24h. Half samples were immersed in 10% NaOCl aqueous solution for 5h. Teeth were sectioned into beams and tested for microtensile bond strengths. Results were analyzed with multiple ANOVA and Tukey's tests (p<0.05). Analysis of debonded surfaces was performed by SEM.

Results

24h bond strengths for Vitremer and Fuji II LC were similar. For Fuji II, bond strength values were higher for primary than for permanent dentin. Vitremer bond strength was similar for both. Chemical degradation did not affect Fuji II LC bond strength to dentin. However, decreases in bond strength were found for Vitremer groups after NaOCl immersion. Signs of glass ionomer–dentin interaction were evident by SEM analysis for Fuji II LC specimens.

Conclusions

Vitremer and Fuji II presented similar bond strength at 24. Vitremer dentin bonds were prone to chemical degradation. Fuji II LC–dentin bonds showed typical features of glass-ionomer dentin interaction at the bonded interfaces, and were resistant to in vitro degradation.

Keywords: Glass-ionomer cements, Dentin, Adhesion, Degradation