Composite resin microhardness: the influence of light curing method, composite shade, and depth of cure

The aim of this study was to investigate the influence of light curing method, composite shade, and depth of cure on composite microhardness. Forty-eight specimens with 4 mm of depth were prepared with a hybrid composite (Filtek Z-100, 3M ESPE); 24 with shade A1 and the remaining with shade C2. For...

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Veröffentlicht in:	The journal of contemporary dental practice 2008-05, Vol.9 (4), p.43-50
Hauptverfasser:	de Araújo, Camila Silveira, Schein, Marcelo Thome, Zanchi, Cesar Henrique, Rodrigues, Jr, Sinval Adalberto, Demarco, Flavio Fernando
Format:	Artikel
Sprache:	eng
Schlagworte:	Color Composite Resins - chemistry Composite Resins - radiation effects Dental Materials - chemistry Dental Materials - radiation effects Dentistry Hardness Humans Light Lighting - instrumentation Materials Testing Polymers - chemistry Polymers - radiation effects Silicon Dioxide - chemistry Silicon Dioxide - radiation effects Surface Properties Temperature Time Factors Water - chemistry Zirconium - chemistry Zirconium - radiation effects
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Zusammenfassung:	The aim of this study was to investigate the influence of light curing method, composite shade, and depth of cure on composite microhardness. Forty-eight specimens with 4 mm of depth were prepared with a hybrid composite (Filtek Z-100, 3M ESPE); 24 with shade A1 and the remaining with shade C2. For each shade, two light curing units (LCUs) were used: a quartz-tungsten-halogen (QTH) LCU (Optilight Plus - Gnatus) and a light emitting diode (LED) LCU (LEC 470 II - MM Optics). The LED LCU was tested using two exposure times (LED 40 seconds and LED 60 seconds). After 24-hour storage, three indentations were made at mm depth intervals using a Knoop indenter. Data were submitted to three-way analysis of variance (ANOVA) and Tukey's test (p
ISSN:	1526-3711 1526-3711
DOI:	10.5005/jcdp-9-4-43