title: Determination of elastic modulus of the components at dentin-resin interface using the ultrasonic device.
abstract: The purpose of this study was to determine the elastic moduli of the components at resin-dentin interface with the use of an ultrasonic device. Dentin plates were obtained from freshly extracted bovine incisors with a shape in rectangular form. Resin composites and bonding agents were polymerized and trimmed in the same shape as the dentin specimens. The ultrasonic equipment employed in this study was comprised of a Pulser-Receiver, transducers, and an oscilloscope. Each elastic modulus was determined by measuring the longitudinal and shear wave sound velocities. The mean elastic modulus of mineralized dentin was 17.4 GPa, while that of demineralized dentin was 1.4 GPa. When the demineralized dentin was immersed in bonding agents, the elastic modulus changed to 3.7-4.7 GPa, and these values were significantly higher than those of demineralized dentin. A gradient in elastic modulus was detected as the analysis shifted from the dentin side to the resin composite.
authors.affiliation: Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: Tamayo
authors.initials: T
authors.lastname: Watanabe
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Inage
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Kurokawa
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects / Q000502:physiology*; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D004492:Edetic Acid / Q000494:pharmacology; D004548:Elasticity; D008689:Methacrylates; D009991:Oscillometry; D019279:Resin Cements; D014159:Transducers; D014465:Ultrasonics
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; C452442:Mac Bond II; C095452:Megabond; D008689:Methacrylates; D019279:Resin Cements; C474103:imperva fluoro bond; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; D004492:Edetic Acid