The effects of acid etching on the pulpodentin complex.
Acid etching of dentin is used by many bonding systems to remove the smear layer and permit bonding directly to the dentin matrix. Although early animal studies indicated that acid etching caused moderate to severe pulpal reactions, there is a high probability that the pulpal irritation may have been due to microleakage of bacteria and their products. As these reactions are not seen following acid etching of dentin using newer dentin bonding systems, it is clear that one can acid etch dentin if, and only if, one can seal the dentin with subsequently placed bonding systems. Because acid etching increases dentin permeability and dentin wetness, successful bonding of adhesive resins to acid-etched dentin requires the use of hydrophilic resins that bond equally well to both peritubular and intratubular dentin. Future trends seem to be toward lowering both the concentration of acids and the time of etching of dentin. While all bonding systems should be carefully scrutinized prior to marketing, the future looks very promising for the use of adhesive resins on acid-etched dentin.
Pashley
D H
DH
Medical College of Georgia, School of Dentistry, Department of Oral Biology-Physiology, Augusta 30912.
D000134:Acid Etching, Dental / Q000009:adverse effects* / Q000379:methods; D000818:Animals; D001840:Dental Bonding; D003763:Dental Leakage; D003782:Dental Pulp / Q000187:drug effects*; D003804:Dentin / Q000737:chemistry / Q000187:drug effects* / Q000648:ultrastructure; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D016369:Smear Layer; D013499:Surface Properties; D013997:Time Factors; D014867:Water
D017220:Dentin-Bonding Agents; D014867:Water