title: Viscoelastic properties of collagen-adhesive composites under water-saturated and dry conditions.
abstract: To investigate the time- and rate-dependent mechanical properties of collagen-adhesive composites, creep and monotonic experiments are performed under dry and wet conditions. The composites are prepared by infiltration of dentin adhesive into a demineralized bovine dentin. Experimental results show that for small stress level under dry conditions, both the composite and the neat adhesive have similar behavior. On the other hand, in wet conditions, the composites are significantly soft and weak compared to the neat adhesives. The behavior in the wet condition is found to be affected by the hydrophilicity of both the adhesive and the collagen. As the adhesive-collagen composites are a part of the complex construct that forms the adhesive-dentin interface, their presence will affect the overall performance of the restoration. We find that Kelvin-Voigt model with at least four elements is required to fit the creep compliance data, indicating that the adhesive-collagen composites are complex polymers with several characteristic time scales whose mechanical behavior will be significantly affected by loading rates and frequencies. Such mechanical properties have not been investigated widely for these types of materials. The derived model provides an additional advantage that it can be exploited to extract other viscoelastic properties which are, generally, time consuming to obtain experimentally. The calibrated model is utilized to obtain stress relaxation function, frequency-dependent storage and loss modulus, and rate-dependent elastic modulus.
authors.affiliation: Department of Mechanical Engineering, 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: Paulette
authors.initials: P
authors.lastname: Spencer
mesh_terms: D000268:Adhesiveness; D000818:Animals; D002417:Cattle; D003094:Collagen / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D004548:Elasticity; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D003738:Dental Cements; D014867:Water; D003094:Collagen
keywords: Voigt model; collagen-adhesive composite; creep; demineralized dentin; dentin adhesive; dry and wet; generalized Kelvin; viscoelastic
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