Bonding agent underneath sealant: shear bond strength to oil-contaminated

Brazilian Dental Journal

Maria Cristina Borsatto¹  Michelle Yamamoto Thomaz¹  Marta Maria Martins Giamatei Contente¹  Jaciara Miranda Gomes-silva¹  Talitha De Siqueira Mellara¹  Rodrigo Galo²  Regina Guenka Palma-dibb² 

[1] ,University of São Paulo Ribeirão Preto Dental School Department of Pediatric Clinics, Preventive and Community DentistryRibeirão Preto SP ,Brazil

关键词: pit-and-fissure sealant;    shear bond strength;    oil contamination;    adhesive system;   

DOI  :  10.1590/S0103-64402010000100008

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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