The development of surface hardness in visible light-cured posterior composites

D. C. Watts, V. McNaughton, A. A. Grant

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The surface microhardness of four visible light-cured posterior composite materials was measured at a series of time intervals up to 1 month, commencing from the end of the light irradation period. The microhardness steadily increased with time and tended towards a maximum, usually reached after 1 week. In all cases the rate of increase was substantial over the first hour and was greater for samples stored at 37°C as compared with 20°C. These results reflect the progressive cross-linking reaction in the resin phase of the materials which continues after photoactivation. The surfaces of samples stored in water were softened compared to dry samples. Differences between materials may be attributed to compositional differences and extent of cure. © 1986.
    Original languageEnglish
    Pages (from-to)169-174
    Number of pages5
    JournalJournal of Dentistry
    Volume14
    Issue number4
    Publication statusPublished - Aug 1986

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