alexa Mechanical behaviour and structure of light-cured special tray materials.
Biomedical Sciences

Biomedical Sciences

Biology and Medicine

Author(s): Devlin H, Cash AJ, Watts DC

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Abstract OBJECTIVES: This study relates some structural characteristics of representative special tray visible light cured (VLC) resin composites to their creep-recovery, hardness and flexural strength properties. VLC prosthodontic materials have not yet achieved the same acceptance as the VLC resin composites, perhaps because less is known of their structural and performance characteristics. METHODS: The VLC resin composites used were Triad, Convertray and Palatray. The inorganic composition was analysed quantitatively by heating known amounts of resin composite to 800 degrees C, and weighing the ash. Elemental composition was determined using X-ray microanalysis. Mechanical properties, including hardness, flexural behaviour and creep recovery, were obtained by standard methods. RESULTS: The inorganic filler content for Palatray was higher than that of Convertray or Triad, and the flexural modulus and flexural strength of Palatray were superior to that of Triad or Convertray. The mean maximum creep strain for the Palatray specimens was only 2.45\% after 5 h loading under 37 MPa and there was a permanent set of 1.5\% after 7 h recovery. CONCLUSIONS: Palatray exhibited superior overall properties and this evidently related primarily to the high volume fraction of filler.
This article was published in J Dent and referenced in Biology and Medicine

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