Assessment of polymerization contraction stress of three composite resins

M. Cadenaro, M. Biasotto, N. Scuor, L. Breschi, C.L. Davidson, R. Di Lenarda

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Objectives: The purpose of this study was to measure the development of contraction stress of three composite resin restorative materials during photo-polymerization: a micro-hybrid composite (Filtek Z250, 3M ESPE, St. Paul, MN, USA); a nano-filled composite (Filtek Supreme, 3M ESPE, St. Paul, MN, USA); and a low-shrinkage composite (Ælite LS, Bisco Inc., Schaumburg, IL, USA).
    Methods: Curing shrinkage stress was measured using a stress-analyzer. Composites were polymerized with a halogen-curing unit (VIP, Bisco Inc., Schaumburg, IL, USA) for 40 s. The contraction force (N) generated during polymerization was continuously recorded for 150 s after photo-initiation. Contraction stress (MPa) was calculated at 20, 40, 60 and 150 s. Data were statistically analyzed.
    Results: The low-shrinkage composite Ælite LS exhibited the lowest stress values compared to other materials (p < 0.05). Statistical analysis did not show significant differences between Filtek Z250 and Filtek Supreme.
    Significance: The low-shrinkage composite showed lower contraction stress than micro-hybrid and nano-filled composite. Ideally, non-shrinking resins would represent the ultimate solution to overcome polymerization contraction and stress-related problems.
    Original languageUndefined/Unknown
    Pages (from-to)681-685
    JournalDental Materials
    Volume24
    Issue number5
    DOIs
    Publication statusPublished - 2008

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