title: Mechanical properties of methacrylate-based model dentin adhesives: effect of loading rate and moisture exposure.
abstract: The aim of this study is to investigate the mechanical behavior of model methacrylate-based dentin adhesives under conditions that simulate the wet oral environment. A series of monotonic and creep experiments were performed on rectangular beam samples of dentin adhesive in three-point bending configuration under different moisture conditions. The monotonic test results show a significant effect of loading rate on the failure strength and the linear limit (yield point) of the stress-strain response. In addition, these tests show that the failure strength is low, and the failure occurs at a smaller deformation when the test is performed under continuously changing moisture conditions. The creep test results show that under constant moisture conditions, the model dentin adhesives can have a viscoelastic response under certain low loading levels. However, when the moisture conditions vary under the same low loading levels, the dentin adhesives have an anomalous creep response accompanied by large secondary creep and high strain accumulation.
authors.affiliation: Mechanical Engineering Department, University of Kansas, Lawrence, Kansas, 66045-7609; Bioengineering Research Center, University of Kansas, Lawrence, Kansas, 66045-7609.
authors.forename: Viraj
authors.initials: V
authors.lastname: Singh
authors.forename: Anil
authors.initials: A
authors.lastname: Misra
authors.forename: Ranganathan
authors.initials: R
authors.lastname: Parthasarathy
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ye
authors.forename: Jonggu
authors.initials: J
authors.lastname: Park
authors.forename: Paulette
authors.initials: P
authors.lastname: Spencer
mesh_terms: D001842:Bone and Bones / Q000378:metabolism; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004548:Elasticity; D006244:Hardness; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D019279:Resin Cements; D013314:Stress, Mechanical; D013499:Surface Properties; D014783:Viscosity
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements
keywords: creep; dentin adhesive; moisture; rate-dependence