title: Effect of prolonged air drying on the bond strength of adhesive systems to dentin.
abstract: This in vitro study evaluated the effect of air-drying time on degree of solvent evaporation (DE), dentin microtensile bond strength (µTBS), and degree of conversion (DC) of 5 adhesive systems: Adper Single Bond 2, XP Bond, Prime & Bond 2.1, OptiBond Solo, and Adper Easy One. For DE testing, 20 µL of each material was submitted to measurements in a digital balance after an air stream of 3, 5, 10, 20, 30, or 60 seconds; the weight loss was computed and converted to a percentage (DE). For µTBS testing, 50 sound human molars were divided into groups (n = 5). The 5 adhesive systems were applied either in accordance with manufacturers' instructions for solvent drying time (control) or with a prolonged drying time (20-30 seconds). After composite resin was built up on the hybridized surfaces, the teeth were stored for 24 hours and then sectioned to obtain beams that were loaded until fracture. For DC testing, specimens of each adhesive and air-drying condition (n = 3) were evaluated by means of attenuated total reflectance Fourier transform infrared spectroscopy. Data were submitted to 2-way analysis of variance, t test, and Spearman test for correlation analysis. Prolonged air drying resulted in significantly greater DE than did the time suggested by the manufacturers. The adhesives XP Bond and Adper Easy One showed significantly greater µTBS with prolonged air drying. The DC was not affected by air-drying time. No statistically significant correlation was found between DC and µTBS values. Depending on the material, bond strength can be improved by prolonged air-drying times.
authors.forename: Stefanie Bressan
authors.initials: SB
authors.lastname: Werle
authors.forename: Ana
authors.initials: A
authors.lastname: Steglich
authors.forename: Fabio Zovico Maxnuck
authors.initials: FZ
authors.lastname: Soares
authors.forename: Rachel Oliveira
authors.initials: RO
authors.lastname: Rocha
mesh_terms: D000096:Acetone / Q000627:therapeutic use; D017438:Bisphenol A-Glycidyl Methacrylate / Q000627:therapeutic use; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000627:therapeutic use*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000627:therapeutic use*; D003890:Desiccation / Q000379:methods*; D006801:Humans; D066298:In Vitro Techniques; D011109:Polymethacrylic Acids / Q000627:therapeutic use; D019279:Resin Cements / Q000627:therapeutic use; D013718:Tensile Strength; D013997:Time Factors
chemical_list: C000612360:Adper Easy One; C554641:Adper single bond 2; D003738:Dental Cements; D017220:Dentin-Bonding Agents; C428805:OptiBond SOLO; D011109:Polymethacrylic Acids; D019279:Resin Cements; C444444:prime and bond 2.1; D000096:Acetone; D017438:Bisphenol A-Glycidyl Methacrylate
keywords: dentin bonding agent; microtensile bond strength; spectroscopy; volatilization