Hardness and degree of conversion of posterior packable composites

Knoop microhardness and the degree of conversion of three packable composites (SureFil, Alert and Solitaire), a microfil composite (Heliomolar), a microhybrid composite (Herculite) and an indirect laboratory-processed composite (Belleglass) were evaluated as a function of distance from the irradiate...

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Veröffentlicht in:	Operative dentistry 2004-11, Vol.29 (6), p.642
Hauptverfasser:	Knobloch, Lisa A, Kerby, Ronald E, Clelland, Nancy, Lee, Jeffrey
Format:	Artikel
Sprache:	eng
Schlagworte:	Acrylic Resins - chemistry Acrylic Resins - radiation effects Composite Resins - chemistry Composite Resins - radiation effects Hardness Humans Light Materials Testing Methacrylates - chemistry Methacrylates - radiation effects Polymers - chemistry Polymers - radiation effects Polyurethanes - chemistry Polyurethanes - radiation effects Spectroscopy, Fourier Transform Infrared Stress, Mechanical Surface Properties Time Factors
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Zusammenfassung:	Knoop microhardness and the degree of conversion of three packable composites (SureFil, Alert and Solitaire), a microfil composite (Heliomolar), a microhybrid composite (Herculite) and an indirect laboratory-processed composite (Belleglass) were evaluated as a function of distance from the irradiated surface. Cylindrical specimens (5.0 mm [diameter] x 6.0 mm [length]) of each material were visible light cured for 60 seconds in black-backed Teflon molds and sectioned. Knoop microhardness values were then obtained at 0-, 2- and 4-mm using a 50-gram load and 20 second dwell time. Degree of conversion was determined using Fourier Transform Infrared Spectroscopy. ANOVA (p
ISSN:	0361-7734