Surface and bulk properties of dental resin-composites after solvent storage

Hanan Al Sunbul, Nikolaos Silikas, David Watts

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    Abstract

    Objectives. To investigate the surface micro-hardness and the diametral tensile strength(DTS) of bulk-fill and conventional resin-composites after storage in food simulating sol-vents.Methods. Eight materials were investigated. For the micro-hardness measurement, Teflonmould with an internal dimensions of 10 mm and 2 mm (n = 15). For the DTS measurement,Split stainless steel moulds were used to make disk-shaped specimens of 6 mm diame-ter and 2 mm thickness (n = 15). Materials were subdivided in to three groups (water, 75%ethanol/water and MEK). Micro-hardness measurements were made under a load of 300 gmwith a dwell time of 15 s at 7, 30, and 90ds after storage. DTS was measured after 30ds at across head speed of 0.5 mm/min.Results. The storage time and type of solvent had a significant influence on the micro-hardness. MEK showed more drastic reduction in the material micro-hardness with anexception of G-aenial universal flo (GA-F) which showed similar results in water/ethanoland MEK. DTS values of materials stored in water ranged from 48.7 MPa for the GA-F and30.6 MPa for Ever X posterior (EXP). Generally, the results are observed to decrease withincreasing solvent power, except for GA-F.Significance. Bulk-fill materials showed no superior results compared with the other mate-rials. For the bulk-fill materials that are designed to be used as a base, their penetration bythe solvents may be shielded and thus the changes observed in this study may not be ofclinical importance
    Original languageEnglish
    JournalDental Materials
    Volume32
    Issue number8
    Early online date26 May 2016
    DOIs
    Publication statusPublished - 2016

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