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Flexural behaviour of post‐cured composites at oral‐simulating temperatures
Author(s) -
Ho C.T.,
Vijayaraghavan T.V.,
Lee S.Y.,
Tsai A.,
Huang H.M.,
Pan L.C.
Publication year - 2001
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2001.00734.x
Subject(s) - composite material , flexural strength , curing (chemistry) , materials science , composite number , softening , epoxy
Post‐curing treatments have been known to improve the mechanical stability of visible light‐cured composites. After individual post‐curing treatment, the flexural strength (FS) of four commercial direct/indirect placement composite materials which differ greatly in composition [oligocarbonate dimethacrylate (OCDMA)‐based Conquest C & B (CQT), Bisphenol‐A glycidyl dimethacrylate (BisGMA)‐based Charisma, urethane dimethacrylate (UDMA)‐based Concept (CCT), and BisGMA/UDMA‐based Dentacolor] was evaluated under water in the temperature range of 12–50 °C. A control series was tested in air at room temperature (25 ± 1 °C). Data were analysed using ANOVA and Duncan’s test. Flexural strengths overall decreased (20–40%, P < 0·01) with increasing temperatures except with Conquest C & B. Surprisingly, higher FS values were found in wet conditions than in dry conditions at 25 °C. UDMA‐based materials much more easily undergo softening in water and by temperature change than do BisGMA‐ or OCDMA‐based materials. Post‐cured composites can be significantly affected by exposure to oral environments. Different composition determines the degree of influence.