title: Bonding agent underneath sealant: shear bond strength to oil-contaminated.
abstract: This study evaluated in vitro the shear bond strength of a resin-based pit-and-fissure sealant (Fluroshield - F) associated with either an ethanol-based (Adper Single Bond 2 - SB) or an acetone-based (Prime & Bond - PB) adhesive system under conditions of oil contamination. Mesial and distal enamel surfaces from 30 sound third molars were randomly assigned to 2 groups (n=30): I - no oil contamination; II - oil contamination. Contamination (0.25 mL during 10 s) was performed after 37% phosphoric acid etching with an air/oil spray. The specimens were randomly assigned to subgroups, according to the bonding protocol adopted: subgroup A - F was applied to enamel without an intermediate bonding agent layer; In subgroups B and C, SB and PB, respectively, were applied, light-cured, and then F was applied and light-cured. Shear bond strength was tested at a crosshead speed of 0.5 mm/min in a universal testing machine. Means (+/- SD) in MPa were: IA-11.28 (+/-1.84); IIA-12.02 (+/-1.15); IB-9.73 (+/-2.38); IIB-9.62 (+/-2.29); IC-28.30 (+/-1.63); and IIC-25.50 (+/-1.91). It may be concluded that the oil contamination affected negatively the sealant bonding to enamel and the acetone-based adhesive system (PB) layer applied underneath the sealant was able to prevent its deleterious effects to adhesion.
authors.affiliation: Department of Pediatric Clinics, Preventive and Community Dentistry, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil. borsatto@forp.usp.br
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
authors.forename: Michelle Yamamoto
authors.initials: MY
authors.lastname: Thomaz
authors.forename: Marta Maria Martins Giamatei
authors.initials: MM
authors.lastname: Contente
authors.forename: Jaciara Miranda
authors.initials: JM
authors.lastname: Gomes-Silva
authors.forename: Talitha de Siqueira
authors.initials: Tde S
authors.lastname: Mellara
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Galo
authors.forename: Regina Guenka
authors.initials: RG
authors.lastname: Palma-Dibb
mesh_terms: D000096:Acetone / Q000737:chemistry; D000134:Acid Etching, Dental; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004340:Drug Contamination; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D009821:Oils / Q000737:chemistry; D063065:Organophosphonates / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D033081:Shear Strength; D012997:Solvents / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D017220:Dentin-Bonding Agents; D009821:Oils; D063065:Organophosphonates; D010756:Phosphoric Acids; D010895:Pit and Fissure Sealants; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C454540:Scotchbond etchant; D012997:Solvents; C444444:prime and bond 2.1; C115612:single bond; D014867:Water; C086661:Fluoroshield; D000096:Acetone; D000431:Ethanol; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid