Bonding agent underneath sealant: shear bond strength to oil-contaminated.
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.
Borsatto
Maria Cristina
MC
Department of Pediatric Clinics, Preventive and Community Dentistry, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil. borsatto@forp.usp.br
Thomaz
Michelle Yamamoto
MY
Contente
Marta Maria Martins Giamatei
MM
Gomes-Silva
Jaciara Miranda
JM
Mellara
Talitha de Siqueira
Tde S
Galo
Rodrigo
R
Palma-Dibb
Regina Guenka
RG
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
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