title: Interfacial adaptation of adhesive materials to root canal dentin.
abstract: Extracted single-rooted maxillary teeth were endodontically treated and filled with gutta-percha/AH-26 (GP), Resilon points/RealSeal (RS), AdheSE DC/Multicore Flow (ADH, self-etch control), or Excite DSC/Multicore Flow (EXC, total-etch control). Specimens were analyzed with electron microscopy using three methods: (a) field emission scanning electron microscopy (FESEM) of the interface; (b) transmission electron microscopy (TEM) of the interface; and (c) FESEM of the material fitting surface. The three adhesive materials (RS, ADH, and EXC) formed a dentin hybrid layer, which nonetheless resulted in interfacial separation. Gaps were more frequent for GP, which did not hybridize dentin. The fitting surfaces exhibited resin tags at all levels for EXC. Tags were less frequent with ADH, especially in the apical third. For RS, resin tags were rare and virtually absent from the apical half, whereas GP did not form tags. Despite the hybridization, a tight seal of the root canal is difficult to achieve because of the complexity and the mechanical challenge of the substrate.
authors.affiliation: Division of Operative Dentistry, Department of Restorative Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA. perdi001@umn.edu
authors.forename: Jorge
authors.initials: J
authors.lastname: Perdigão
authors.forename: Maria M
authors.initials: MM
authors.lastname: Lopes
authors.forename: George
authors.initials: G
authors.lastname: Gomes
mesh_terms: D000269:Adhesives; D003188:Composite Resins; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003804:Dentin; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008854:Microscopy, Electron / Q000295:instrumentation / Q000379:methods; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation
chemical_list: D000269:Adhesives; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C511498:Real Seal composite resin; D019279:Resin Cements; D012387:Root Canal Filling Materials; C486892:resilon sealer