title: Tubular occlusion optimizes bonding of hydrophobic resins to dentin.
abstract: Although hydrophobic resins may be bonded to acid-etched dentin with an ethanol wet-bonding technique, the protocol is sensitive to moisture contamination when bonding is performed in deep dentin. This study tested the hypothesis that the use of oxalate or poly(glutamic) acid-modified, diluted ceramicrete (PADC) for dentinal tubule occlusion prevents fluid contamination and improves the bonding of an experimental hydrophobic adhesive to acid-etched, ethanol-dehydrated dentin. Mid-coronal and deep acid-etched moist dentin pre-treated with oxalate or PADC was dehydrated by ethanol wet-bonding and infiltrated with the experimental three-step etch-and-rinse hydrophobic adhesive under simulated pulpal pressure. Tensile bond strengths to deep dentin without pre-treatment were severely compromised. Conversely, oxalate and PADC pre-treatments reduced dentin permeability, prevented water contamination, and improved bond strengths. Minimal nanoleakage was identified within hybrid layers created in the oxalate- and PADC-pre-treated deep dentin. The use of tubular occluding agents optimized bonding of hydrophobic resins to dentin.
authors.affiliation: Department of Dental Materials, School of Dentistry, University of São Paulo, Brazil.
authors.forename: F T
authors.initials: FT
authors.lastname: Sadek
authors.forename: D H
authors.initials: DH
authors.lastname: Pashley
authors.forename: M
authors.initials: M
authors.lastname: Ferrari
authors.forename: F R
authors.initials: FR
authors.lastname: Tay
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure*; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D010070:Oxalates / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011099:Polyglutamic Acid / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012387:Root Canal Filling Materials; D012997:Solvents / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D010070:Oxalates; D010710:Phosphates; D011109:Polymethacrylic Acids; D017680:Potassium Compounds; D012387:Root Canal Filling Materials; D012997:Solvents; C526968:ceramicrete; C020946:triethylene glycol dimethacrylate; D011099:Polyglutamic Acid; D008277:Magnesium Oxide; D000431:Ethanol; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C013216:potassium phosphate