The morphologic relationship between dental resins and etched dentin.
A scanning electron microscopic examination of the interface between etched dentin and several different commercial resins showed that pretreatment with othophosphoric acid enlarged the dentinal tubules facilitating penetration of the resin. The depth of penetration increased from approximately 0.2 mm to 2.0 mm when dentin was dried for 24 hours compared to using the normal clinical protocol. The hydration of dentin and/or the presence of dentinal fluid probably influences the degree of resin penetration. While penetration would provide a means of mechanical retention of resin it would probably do so at the expense of dentin and pulp viability particularly where remaining dentin thickness is less than 1.0 mm. Penetration of toxic resin would account in part for the enhanced inflammatory pulpal response observed following application of acid etch restorative procedures.
D000042:Absorption; D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure*; D006801:Humans; D010756:Phosphoric Acids / Q000494:pharmacology; D013499:Surface Properties
D003188:Composite Resins; D010756:Phosphoric Acids