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Resin Permeation into Acid-conditioned, Moist, and Dry Dentin: A Paradigm using Water-free Adhesive Primers

Department of Children's Dentistry and Orthodontics, School of Dental Medicine, State University of New York at Stony Brook, Long Island, New York 11794-8702, USA

A.J. Gwinnett

Department of Oral Biology and Pathology, School of Dental Medicine, State University of New York at Stony Brook, Long Island, New York 11794-8702, USA

K.M. Pang

Oral Biology Unit, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Hong Kong

S.H.Y. Wei

Department of Children's Dentistry and Orthodontics, School of Dental Medicine, State University of New York at Stony Brook, Long Island, New York 11794-8702, USA

Preservation of the morphological integrity of demineralized dentin collagen in its hydrated state may account for the success observed in wet-bonding procedures. This study investigated the micromorphological differences between moist- and dry-bonding techniques with the use of: (a) Aelitebond, an alcohol-based, water-free, single-component dentin adhesive primer system; and (b) a water-free, acetone-based experimental primer similar to the acetone-based, water-containing All-Bond 2, a two-component primer system. In the wet groups, acid-conditioned dentin surfaces were blotted so that they remained visibly moist prior to bonding. In the dry groups, dentin surfaces were air-dried for 30 sec. Following the bonding procedures, dentin discs in each group were laminated together by means of a chemical-cure resin and processed for scanning electron microscope (SEM) and transmission electron microscope (TEM) examination. Conditioning with 10% H3PO4 for 20 sec. produced complete demineralization of the outer dentin. In the wet groups, banded collagen and interfibrillar spaces could be observed at the surface of the acid-conditioned dentin. Complete wetting of the loosely arranged collagen fibrils by the resin resulted in the formation of a hybrid layer. In the dry groups, only a very thin hybrid layer was observed on the dentin surface, along the walls of the tubules, and along the course of their lateral branches. The absence of banded collagen and interfibrillar spaces within these areas suggested the existence of a collapsed dentin matrix along various liquid-vapor boundaries that restricted resin permeation into the subsurface intertubular matrix, producing an incompletely infiltrated "hybridoid region".

Key Words: acid-conditioned dentin • moist and dry bonding • resin permeation • hybridoid region

Journal of Dental Research, Vol. 75, No. 4, 1034-1044 (1996)
DOI: 10.1177/00220345960750040601


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