Resistance to degradation of resin-modified glass-ionomer cements dentine bonds.
OBJECTIVE
To evaluate the effect of EDTA pre-treatment of dentine on resistance to degradation of the bond between dentine and resin-modified glass-ionomer cements.


METHODS
Sixty 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 pre-treated with EDTA (0.1M, pH 7.4) for 60s. Teeth were stored in water at 37 degrees C for 24h, 3 months or submitted to 10% NaOCl immersion for 5h. Teeth were sectioned into beams (1+/-0.1mm) and tested to failure in tension at 0.5mm/min. Bond strength data (MPa) were analyzed by ANOVA and SNK multiple-comparisons tests (p<0.05).


RESULTS
When EDTA was used for pre-treatment of dentine, higher bond strengths were observed for both cements. Degradation challenges produced a decrease in bond strength values only in the Vitremer group. This decrease was avoided when EDTA was used for dentine treatment before restoring with Vitremer.


CONCLUSIONS
EDTA pre-treatment of dentine increases bond strength of resin modified glass-ionomers cements to dentine and improves resistance to degradation of the bond between Vitremer and dentine.
Fagundes
Ticiane C
TC
Department of Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Brazil.
Toledano
Manuel
M
Navarro
Maria Fidela L
MF
Osorio
Raquel
R
D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004356:Drug Storage; D004492:Edetic Acid / Q000494:pharmacology; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008963:Molar; D012117:Resins, Synthetic; D012973:Sodium Hypochlorite; D013718:Tensile Strength; D014867:Water
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D012117:Resins, Synthetic; C084550:Vitremer; D014867:Water; D004492:Edetic Acid; D012973:Sodium Hypochlorite