Biomedical Engineering- Conference Papers

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Browsing Biomedical Engineering- Conference Papers by Author "Adegbulugbe, C.I"

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    Open Access
    Influences on Flexural Strength And Deformation Behavior of Led Cured Microhybrid And Nanofilled Dental Resin Composites
    (2015 Biomedical Engineering Society Annual Meeting, 2015, Tampa, Florida, United States, 2015) Osuntoki, A.A; Ajibola, O.O.E; Adeleye, O.A; Fakinlede, O.A; Adegbulugbe, C.I
    A major modern application of engineering materials is to support biological tissues. Mechanical tests that closely simulate the real world activity on these materials are the most reliable way of predicting their service performance under load bearing activity. Flexural strength is an important property for characterizing brittle materials because the test generates complex tensions by combining tensile stress, compression and shear. In general, high flexural strength is desired for restorative materials that support the occlusal forces of posterior teeth. Several factors such as curing time and strain rates as well as the constituents of the dental resin composites affect the flexural strength. Deformation behaviour of restorations, such as shrinkage and shearing from curing and mastication, have also been a major concern for clinicians because of void and crack formations in restored tooth structure which affects the mechanical properties of the resin composites.
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    Open Access
    Viscoelastic-Viscoplastic Material Model for Nonlinear Deformation of Dental Resin Composites
    (21st International Conference on Computer Methods in Mechanics, 2015, Gdansk, Poland, 2015) Adeleye, O.A; Fakinlede, O.A; Ajiboye, J.S; Adegbulugbe, C.I
    The rate-dependence, recoverable and irrecoverable nonlinear deformation behavior of microhybrid and nanofilled dental resin composites cured with the conventional light emitting diode (LED) and exponential light emitting diode (HiLED) composites under uniaxial loading is here presented. Experimental study based on displacement controlled multiple stress creep recovery (MSCR) tests revealed hysteresis loop in loading and unloading states indicating an inherent viscoelastic nature, and at stress values less than 4 MPa, rate dependent recoverable strains were observed. But at stress values higher than 4 MPa, irreversible strains were observed which also indicates viscoplasticity. Hence a viscoelastic-viscoplastic constitutive model can be used to represent the material deformation behavior for the dental resin composite.