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Journal of Dental Research
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EDTA Treatment Improves Resin-Dentin Bonds’ Resistance to Degradation

R. Osorio1, M.C.G. Erhardt2, L.A.F. Pimenta2, E. Osorio1 and M. Toledano1,*

1 Department of Dental Materials, School of Dentistry, University of Granada, Granada, Spain; and
2 Department of Restorative Dentistry, School of Dentistry. University of Campinas, Piracicaba, São Paulo, Brazil;


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  		Figure. SEM images of the fractured interface on the dentin side of debonded specimens (A) after 24 hrs of water storage and bonded with phosphoric-acid-etching and Adper Scotchbond 1. Note failure at the base of the hybrid layer, showing partial cohesive fractures (CF) of demineralized dentin just below the hybrid layer. (B) After 24 hrs of water storage and bonded with EDTA treatment and Adper Scotchbond 1. Note failure at the top of the hybrid layer. No cohesive fracture of dentin is evidenced, and a mild dentin demineralization pattern not affecting peritubular dentin is observed. (C) After 24 hrs of water storage and bonded with Clearfil SE Bond. Failure is found either at the adhesive resin layer (AR), at the base of the hybrid layer (BHL), or within the hybridized smear layer (HSL) in the same image. (D) Bonded with phosphoric-acid-etching and Adper Scotchbond 1, and debonded after NaOClaq immersion. The intertubular dentin appearance is that of etched and NaOClaq-treated dentin, showing no collagen and enlarged tubules with many interconnecting canals. (E) Bonded with EDTA treatment and Adper Scotchbond 1, and debonded after NaOClaq immersion, intertubular dentin is not affected by NaOClaq, peritubular dentin is observed, and some tubule entrances remain resin-occluded. (F) Bonded with Clearfil SE Bond, debonded after NaOClaq immersion. Main failure is visible within the hybridized smear layer (HSL), and intertubular dentin remains unaltered by the NaOClaq.

 

Journal of Dental Research, Vol. 84, No. 8, 736-740 (2005)
DOI: 10.1177/154405910508400810
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