title: Changes in elastic modulus of adhesive and adhesive-infiltrated dentin during storage in water.
abstract: The purpose of this study was to determine the elastic modulus of components at the resin-dentin interface with the use of an ultrasound device. Dentin slabs were obtained from freshly extracted bovine incisors shaped into a rectangular form. After demineralization, the dentin specimens were immersed in adhesives and polymerized. Adhesives were also polymerized and trimmed into the same shape as the dentin slabs. The specimens were then immersed in distilled water at 37 degrees C for up to one year. The ultrasound equipment employed in this study was a Pulser-Receiver, transducers and an oscilloscope. By measuring the longitudinal and shear wave sound velocities, the elastic modulus was determined. When the elastic modulus of adhesive resin-infiltrated demineralized dentin was compared with that of adhesives, slightly but significantly lower values were found for adhesives used in a self-etching primer system. On the other hand, a higher elastic modulus was observed for resin-infiltrated dentin than for an adhesive used in an etch and rinse system. The elastic modulus of the resin-infiltrated dentin prepared with the etch and rinse system was affected by long-term storage in distilled water.
authors.affiliation: Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: Genta
authors.initials: G
authors.lastname: Yasuda
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Inage
authors.forename: Ryo
authors.initials: R
authors.lastname: Kawamoto
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Shimamura
authors.forename: Chikako
authors.initials: C
authors.lastname: Takubo
authors.forename: Yukie
authors.initials: Y
authors.lastname: Tamura
authors.forename: Kensaku
authors.initials: K
authors.lastname: Koga
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D003648:Decalcification Technique; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D055119:Elastic Modulus; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D009991:Oscillometry / Q000295:instrumentation; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014159:Transducers; D014465:Ultrasonics; D014867:Water / Q000737:chemistry*
chemical_list: C112828:Clearfil AP-X; C029849:Clearfil Bonding Agent; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C503681:FL-BOND S-1; C444701:Filtek Z250; C083468:Lite-fil CR; C452442:Mac Bond II; D008689:Methacrylates; D019279:Resin Cements; C086113:palfique estelite; C115612:single bond; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate