title: Influence of environmental conditions on dentin bond strengths of recently developed dentin bonding systems.
abstract: A study was conducted to investigate the influence of temperature and relative humidity (RH) on the bond strengths of several recently developed dentin bonding systems. Six environmental conditions, (A) 25+/-0.5 degrees C, 50+/-5% RH, (B) 25+/-0.5 degrees C, 80+/-5% RH, (C) 25+/-0.5 degrees C, 95+/-5 % RH, (D) 37+/-0.5 degrees C, 50 +/-5 % RH, (E) 37+/-0.5 degrees C, 80+/-5% RH, (F) 37+/-0.5 degrees C, 95+/-5 % RH were used. Bovine mandibular incisors were mounted in self-curing resin and the facial surfaces were ground on wet #600 SiC paper to expose the dentin. After the tooth surface had been treated according to each manufacturer's instructions, adhesives were applied, followed by condensation of resin composites into a mold placed on the dentin surface. Fifteen specimens per group were stored in distilled water at 37 degrees C for 24 h, and then shear-tested at a cross-head speed of 1.0 mm/min. Statistical analysis was carried out with two-way ANOVA followed by Tukey's test (P<0.05). Dentin bond strengths decreased with increasing relative humidity but were not influenced by environmental temperature. Even though one-bottle adhesive systems require a wet dentin surface, their bond strengths are affected by an increase in environmental humidity.
authors.affiliation: Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan. miyazaki-m@dent.nihon-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Miyazaki
authors.forename: A
authors.initials: A
authors.lastname: Rikuta
authors.forename: K
authors.initials: K
authors.lastname: Tsubota
authors.forename: I
authors.initials: I
authors.lastname: Yunoki
authors.forename: H
authors.initials: H
authors.lastname: Onose
mesh_terms: D000473:Alkanes / Q000737:chemistry; D000704:Analysis of Variance; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D003080:Cold Temperature; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006358:Hot Temperature; D006813:Humidity; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012822:Silicon Dioxide; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry; D015040:Zirconium
chemical_list: D000473:Alkanes; C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C112828:Clearfil AP-X; C112274:Clearfil Liner Bond 2; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; C074806:Imperva-Bond; C083468:Lite-fil CR; D008298:Maleates; D008689:Methacrylates; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; C420128:Spectrum composite resin; C115514:Tokuso Mac Bond; C083568:Z100 composite resin; C115612:single bond; D014867:Water; C073858:Palfique Bonding Agent; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium