title: Influence of environmental conditions on orthodontic bracket bonding of self-etching systems.
abstract: The influence of temperature and relative humidity (RH) on the bond strength of orthodontic adhesives was investigated. Two self-etching/composite type, one acid-etching/composite type, and one acid-etching/PMMA type of adhesives were examined under different temperature and RH conditions. Orthodontic brackets were bonded to bovine enamel, and shear bond strength test was performed at a crosshead speed of 1.0 mm/min after 24-hour storage in 37 degrees C water. Data were analyzed by Tukey's HSD test. Each specimen was assigned an ARI score. All the materials tested exhibited their highest bond strength under room conditions at a range of 10.4-17.0 MPa. Conversely, when under a lower RH condition, bond strength for all the systems ranked the lowest within a range of 6.8-12.0 MPa, with bond failure at the bracket-adhesive interface. These results demonstrated that care should be exercised when using orthodontic adhesive systems in the oral environment.
authors.affiliation: Department of Operative Dentistry, Nihon University School of Dentistry 1-8-13, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
authors.forename: Akitomo
authors.initials: A
authors.lastname: Rikuta
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yoshida
authors.forename: Keishi
authors.initials: K
authors.lastname: Tsubota
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Tsuchiya
authors.forename: Akimasa
authors.initials: A
authors.lastname: Tsujimoto
authors.forename: Maiko
authors.initials: M
authors.lastname: Ota
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000180:Acrylic Resins / Q000737:chemistry; D000818:Animals; D002417:Cattle; D004868:Equipment Failure; D006813:Humidity; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; C519484:Beauty Ortho Bond; C472990:Kurasper F; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; C084543:Super Bond D-Liner; C429625:Transbond Plus Self-Etching Primer; D014867:Water