Nanohardness and Elastic Modulus of Different Resin Cements After Accelerated Aging

Ana Paula Gebert de Oliveira Franco^1*, Renata Tomazini de Queiroz², Márcio José Fraxino Bindo³, Nerildo Luiz Ulbrich³, Osnara Maria Mongruel Gomes⁴ & Rui Fernando Mazur⁵

¹PhD in Dentistry, Pontifice University Catholic of Paraná, Curitiba, Paraná, Brazil
²Student of Dentistry, Pontifice University Catholic of Paraná, Curitiba, Paraná, Brazil
³Professor of Dentistry, Federal University of Paraná, Curitiba, Paraná, Brazil
⁴Professor of Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil
⁵PhD in Restorative Dentistry, Paulist State University Júlio Mesquita Filho, São Paulo, São Paulo, Brazil

Dr. Ana Paula Gebert de Oliveira Franco, PhD in Dentistry, Pontifice University Catholic of Paraná, Curitiba, Paraná, Brazil.

Keywords: Nanoindentation; Resin Cements; Mechanical Properties; Thermocycling

Abstract

Background
The properties of resin cements used to lute prosthesis to dental structures should be investigated by simulating the oral environment.
Objective
The aim of this study was to evaluate the mechanical properties of resin cements of chemical and dual sets by immediate hardness and after accelerated aging by thermocycling.
Method
Five Disc shaped specimens were prepared for each resin cement evaluated using a metallic mold (10mm diameter X 1mm thick). The resin cements evaluated in the present study were: Multilink (Ivoclar-Vivadent), Relyx ARC (3M/ESPE), All Cem (FGM), Enforce (Caulk/Dentsply), Variolink II (Ivoclar-Vivadent), and Relyx U-200 (3M/ESPE). The specimens were subjected to indentations before and after accelerated aging by thermocycling to determine mechanical properties such as hardness and elastic modulus.

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