Resistance to Degradation of Resin-Modified Glass-Ionomer Cements Bonded to Dentin

Objective: To evaluate the effect of EDTA pretreatment of dentin on resistance to degradation of resin modified glass ionomer cements bonded to dentin. Methods: Thirty-six non-carious human molars underwent cavity preparations. Teeth were restored with Fuji II LC or Vitremer. Half of the cavities were restored following manufacturers' instructions whereas the other half was pretreated with EDTA (0.1 M, pH 7.4) for 60s. Teeth were stored in water at 37ºC for 24h, 3 months or submitted to 10% NaOCl immersion for 5h. Teeth were sectioned into beams (1mm±0.1mm) and tested to failure in tension at 0.5 mm/min. Bond strength data (MPa) were analyzed by ANOVA and SNK multiple-comparisons tests (p<0.05). Results: Means and standard deviations are presented in the table. Letters show differences in rows and * in columns. Conclusion: EDTA pretreatment of dentin increases bond strength of resin modified glass ionomer materials to dentin, and is able to avoid degradation of Vitremer-dentin bonds. Supported by grant CICYT/ FEDER MAT 2004-06872-C03-02.

	Fuji II LC			Vitremer
	24h	NaOCl	3m	24h	NaOCl	3m
Manufacturers'	6.7±1.8B *	5.9±1.2 B,C *	5.2±2.2 B,C *	7.9±2.7 A *	4.9±2.0 C  *	4.6±1.7 C *
EDTA	10.7±2.8 A *	9.8±2.5 A *	9.2±2.1 A *	9.5±2.2 A *	9.7±2.4 A *	8.5±2.7 B *