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Resin composite blocks via high-pressure high-temperature ...

Resin composite blocks via high-pressure high-temperature ...

Resin composite blocks via high-pressure high-temperature

d e n t a l m a t e r i a l s 2 8 ( 2 0 1 2 ) 529–534Available online at www.sciencedirect.comjo u rn al hom epa ge : www.intl.elsevierhealth.com/journals/demaResin composite blocks via high-pressure high-temperaturepolymerizationJean-François Nguyen a , Véronique Migonney b , N. Dorin Ruse c,∗ , Michaël Sadoun aa Unité de Recherches Biomatériaux Innovants et Interfaces (URB2I-EA4462), Faculté de chirurgie dentaire, Université Paris Descartes,Sorbonne Paris Cité, Paris, Franceb CNRS UMR- Université Paris 13. Laboratoire de Chimie, Structure et Propriétés de Biomatériaux et d’agents Thérapeutiques(CSPBAT).UFR SMBH, Bobigny, France, Institut Galilée, Villetaneuse, Francec Faculty of Dentistry, University of British Columbia, Vancouver, Canadaa r t i c l e i n f oa b s t r a c tArticle history:Received 29 July 2011Received in revised form9 November 2011Accepted 1 December 2011Keywords:CompositesPressure polymerizationMechanical propertiesPhysical propertiesObjectives. The aim of this study was to thermo-polymerize under high pressure four commerciallyavailable dental resin composites to obtain and characterize composite blockssuitable for CAD/CAM procedures.Methods. Gradia (GC, Japan), Vita VM LC (Vita Zahnfabrik, Germany), Grandio (VOCO,Germany), and EsthetX (Dentsply, Germany), were selected for this study. Paradigm (3 MESPE, USA), a CAD/CAM composite block, was included for comparison. Composite blockswere obtained through polymerization at high-temperature high-pressure (HT/HP). Samplesfor mechanical/physical characterizations were cut from Paradigm and HT/HP compositeblocks while control samples were obtained by photo-polymerizing (PP) the materials inmolds. Flexural strength ( f ), fracture toughness (K IC ), hardness, and density () were determinedand compared by pairwise t-tests (˛ = 0.05). Fractured surfaces were characterizedunder a scanning electron microscope.Results. The results have shown that HT/HP polymerization resulted in a significant (p < 0.05)increase in f , hardness, and for all composites investigated. Even if K IC of all materialswas increased by HT/HP polymerization, significant increases were detected only for Gradiaand EsthetX. The Weibull modulus of HT/HP polymerized composites was higher thanthat of PP counterparts. HT/HP materials had higher f , Weibull modulus, and K IC comparedto Paradigm. The most significant SEM observation of fractured K IC specimens fromall the materials tested was the presence of fewer and smaller voids in HT/HP polymerizedcomposites.Significance. The results of this study suggest that HT/HP polymerization could be usedto obtain dental resin composite blocks with superior mechanical properties, suitable forCAD/CAM processing.© 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.∗ Corresponding author at: Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3 Canada,Faculté de chirurgie dentaire, Université Paris Descartes, Sorbonne Paris Cité, 1 rue Maurice Arnoux, 92120 Montrouge, France.Tel.: +33 1 58 07 68 01; fax: +33 1 49 65 99 89.E-mail address: dorin@dentistry.ubc.ca (N.D. Ruse).0109-5641/$ – see front matter © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.doi:10.1016/j.dental.2011.12.003

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