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Effects of HEMA/Solvent Combinations on Bond Strength to Dentin

¹ Department of Operative Dentistry, Endodontics and Dental Materials, University of São Paulo, Bauru School of Dentistry, FOB USP, Depto. Dentística, Al. Otávio P. Brisola 9-75, Bauru, SP, 17012-101, Brazil;
² Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong, SAR, China; and
³ Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA, USA;

View larger version (13K): [in a new window]   Figure 1. Regression analysis of bond strength vs. width of interfibrillar spaces.

View larger version (105K): [in a new window]   Figure 2. Representative transmission electron micrographs of silver-impregnated and non-impregnated bonded interfaces. (A,B) Specimens primed with 35 vol% HEMA in water. (A) Stained demineralized specimen. (B) Unstained, non-demineralized specimen immersed in silver nitrate. (C,D) Specimens primed with 35 vol% HEMA in methanol. (C) Stained demineralized specimen. (D) Unstained, non-demineralized specimen immersed in silver nitrate. (E,F) Specimens primed with 35 vol% HEMA in ethanol. (E) Stained, demineralized specimen. (F) Unstained, non-demineralized specimen immersed in silver nitrate. (G,H) Specimens primed with 35 vol% HEMA in propanol. (G) Stained, demineralized specimen. (H) Unstained, non-demineralized specimen immersed in silver nitrate. For all figures: CA = adhesive layer; D = demineralized dentin; U = undemineralized dentin; H = hybrid layer; ER = embedding resin infiltrated at a fractured site above the hybrid layer, which occurred during specimen preparation; and Pointer = interfibrillar spaces.