Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin

The following hypothesis was tested: direct composites additional polymerization improve the surface microhardness of direct composite resin Filtek Z250 (3M ESPE). We prepared 25 specimens (2x4 mm) with a stainless steel mold. Resin specimens were randomly assigned into 5 groups (n=5/per group): G1...

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Autores principales:	Carvalho,Rodrigo F, Faria,Camila R, Cruz,Fernando L. G, Brigolini de Faria,Júlio César, Leite,Fabíola P. P
Lenguaje:	English
Publicado:	Universidad de La Frontera. Facultad de Medicina 2013
Materias:	composite resin microhardness polymerization
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-381X2013000100015
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spelling	oai:scielo:S0718-381X20130001000152014-09-09Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite ResinCarvalho,Rodrigo FFaria,Camila RCruz,Fernando L. GBrigolini de Faria,Júlio CésarLeite,Fabíola P. P composite resin microhardness polymerization The following hypothesis was tested: direct composites additional polymerization improve the surface microhardness of direct composite resin Filtek Z250 (3M ESPE). We prepared 25 specimens (2x4 mm) with a stainless steel mold. Resin specimens were randomly assigned into 5 groups (n=5/per group): G1 - resin Filtek Z250 photoactivated 60 s; G2 - resin Filtek Z250 photoactivated 60 s + autoclave cycle to 134°C for 7 min at a pressure of 2.5 kg/cm3; G3 - resin Filtek Z250 photoactivated 60 s + oven at 125°C for 7 min; G4 - resin Filtek Z250 photoactivated 60 s + microwave for 3 min to the power of 450W; G5 - indirect resin Resilab photoactivated 60 s + supplementary furnace LUX GDS 4 min. The specimens were fabricated by a metal matrix, filled with resin in two increments and each increment polymerized according to their group. For polymerization of the last layer, we used a glass plate on a polyester strip. Then the specimens were evaluated for surface microhardness Knoop. Additional polymerization media resulted in significant differences among the groups (p<0.05) (One-way ANOVA and Dunnett test, p=0.05). The mean surface hardness Knoop (KHM) were as follows: G1: 51.71+1.73b; G2: 62.37+1.71a; G3: 50.61+1.30b; G4: 52.65+1.125b; G5: 60.15+2.02a; Conclude that the additional polymerization in autoclave increased the surface microhardness Knoop of composite resin evaluated. Hypothesis was partially confirmed.info:eu-repo/semantics/openAccessUniversidad de La Frontera. Facultad de MedicinaInternational journal of odontostomatology v.7 n.1 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-381X2013000100015en10.4067/S0718-381X2013000100015
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	composite resin microhardness polymerization
spellingShingle	composite resin microhardness polymerization Carvalho,Rodrigo F Faria,Camila R Cruz,Fernando L. G Brigolini de Faria,Júlio César Leite,Fabíola P. P Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
description	The following hypothesis was tested: direct composites additional polymerization improve the surface microhardness of direct composite resin Filtek Z250 (3M ESPE). We prepared 25 specimens (2x4 mm) with a stainless steel mold. Resin specimens were randomly assigned into 5 groups (n=5/per group): G1 - resin Filtek Z250 photoactivated 60 s; G2 - resin Filtek Z250 photoactivated 60 s + autoclave cycle to 134°C for 7 min at a pressure of 2.5 kg/cm3; G3 - resin Filtek Z250 photoactivated 60 s + oven at 125°C for 7 min; G4 - resin Filtek Z250 photoactivated 60 s + microwave for 3 min to the power of 450W; G5 - indirect resin Resilab photoactivated 60 s + supplementary furnace LUX GDS 4 min. The specimens were fabricated by a metal matrix, filled with resin in two increments and each increment polymerized according to their group. For polymerization of the last layer, we used a glass plate on a polyester strip. Then the specimens were evaluated for surface microhardness Knoop. Additional polymerization media resulted in significant differences among the groups (p<0.05) (One-way ANOVA and Dunnett test, p=0.05). The mean surface hardness Knoop (KHM) were as follows: G1: 51.71+1.73b; G2: 62.37+1.71a; G3: 50.61+1.30b; G4: 52.65+1.125b; G5: 60.15+2.02a; Conclude that the additional polymerization in autoclave increased the surface microhardness Knoop of composite resin evaluated. Hypothesis was partially confirmed.
author	Carvalho,Rodrigo F Faria,Camila R Cruz,Fernando L. G Brigolini de Faria,Júlio César Leite,Fabíola P. P
author_facet	Carvalho,Rodrigo F Faria,Camila R Cruz,Fernando L. G Brigolini de Faria,Júlio César Leite,Fabíola P. P
author_sort	Carvalho,Rodrigo F
title	Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
title_short	Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
title_full	Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
title_fullStr	Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
title_full_unstemmed	Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin
title_sort	consequences of the additional polymerization on knoop microhardness of direct composite resin
publisher	Universidad de La Frontera. Facultad de Medicina
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-381X2013000100015
work_keys_str_mv	AT carvalhorodrigof consequencesoftheadditionalpolymerizationonknoopmicrohardnessofdirectcompositeresin AT fariacamilar consequencesoftheadditionalpolymerizationonknoopmicrohardnessofdirectcompositeresin AT cruzfernandolg consequencesoftheadditionalpolymerizationonknoopmicrohardnessofdirectcompositeresin AT brigolinidefariajuliocesar consequencesoftheadditionalpolymerizationonknoopmicrohardnessofdirectcompositeresin AT leitefabiolapp consequencesoftheadditionalpolymerizationonknoopmicrohardnessofdirectcompositeresin
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Consequences of the Additional Polymerization on Knoop Microhardness of Direct Composite Resin

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