Análise da resistência flexural e microdureza de dois sistemas de cerâmica aluminizada infiltrada por vidro / Analysis of flexural strength and microhardness of two alumina glass infiltrated ceramic systems
Rev. bras. odontol
;
69(2): 148-153, Jul.-Dez. 2012. ilus
Article
in Portuguese
| LILACS
| ID: lil-720330
RESUMO
O estudo avaliou in vitro a resistência flexural e a microdureza de dois sistemas de cerâmica aluminizada infiltrada por vidro In-Ceram Alumina (Vita) e Alglass (Celmat). Foram testados corpos de prova em forma de barra, conforme a ISO 6872-1998, foram testados em ensaios de resistência flexural de três pontos e microdureza Vickers, por indentação. Analisou- se a superfície de fratura dos corpos por MEV. In-Ceram Alumina apresentou maior resistência à flexão (441,7 ± 54,1 MPa) que o Alglass (287,8 ± 53,6 MPa). Os sistemas não apresentaram diferença estatística para microdureza 1210,4 ± 90,0 HV e 1135,6 ± 117,5 HV, respectivamente. In-Ceram Alumina apresentou na superfície de fratura maior homogeneidade e menor número de poros que o Alglass. O Alglass, com custo reduzido comparado ao In-Ceram Alumina, atendeu à ISO 6872-1998 podendo ser empregado clinicamente
ABSTRACT
The aim of this work was to evaluate, in vitro, the microhardness, mechanical properties and fracture surface morphology of two different systems of glass infiltrated dental ceramic In-Ceram Alumina (Vita) and Alglass (Celmat) systems. Both materials were used to prepare bar-shaped specimens according to ISO 6872-1998. Three point flexural strength and Vickers microhardness through indentation tests were used to evaluate the samples. The samples surface fracture was achieved through SEM. The Results showed that In-Ceram Alumina presented higher flexural strength values (441.7 ± 54.1 MPa) than Alglass (287.8 ± 53.6 MPa). There was no significant statistic difference in microhardness Vickers results (1210,4 ± 90,0 HV; 1135,6 ± 117,5 HV) between two groups, respectively. In-Ceram Alumina had more homogeneity and less pores at fracture surface than the Alglass. However, Alglass has reduced costs in relation to In-Ceram Alumina and reached the ISO 6872-1998 standard requirements, by this mean this material can be considered to be used clinically used
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Index:
LILACS (Americas)
Main subject:
Ceramics
/
Dental Prosthesis
/
Flexural Strength
Language:
Portuguese
Journal:
Rev. bras. odontol
Journal subject:
Dentistry
Year:
2012
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Uerj/BR
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