Effect of zirconia and alumina fillers on the microstructure and mechanical strength of dental glass ionomer cements

Martinelli, Antonio Eduardo; Souza, Júlio C. M.; Silva, Joel B.; Aladim, Andrea; Carvalho, Oscar; Nascimento, Rubens M.; Silva, Filipe S.; Henriques, Bruno

Effect of zirconia and alumina fillers on the microstructure and mechanical strength of dental glass ionomer cements

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dc.contributor.author	Martinelli, Antonio Eduardo
dc.contributor.author	Souza, Júlio C. M.
dc.contributor.author	Silva, Joel B.
dc.contributor.author	Aladim, Andrea
dc.contributor.author	Carvalho, Oscar
dc.contributor.author	Nascimento, Rubens M.
dc.contributor.author	Silva, Filipe S.
dc.contributor.author	Henriques, Bruno
dc.date.accessioned	2021-02-22T19:02:32Z
dc.date.available	2021-02-22T19:02:32Z
dc.date.issued	2016-03
dc.description.resumo	Background: Glass-ionomer cements perform a protective effect on the dentin-pulp complex considering the F ions release and chemical bonding to the dental structures. On the other hand, those materials have poor physic-mechanical properties in comparison with the restorative resin composite. The main aim of this work was to evaluate the influence of zirconia and/or alumina fillers on the microstructure and strength of a resin modified glass-ionomer cement after thermal cycling. Methods: An in vitro experimental study was carried out on 9 groups (n = 10) of cylindrical samples (6 x 4 mm) made from resin modified glass-ionomer (Vitremer, 3M, USA) with different contents of alumina and/or zirconia fillers. A nano-hybrid resin composite was tested as a control group. Samples were mechanically characterized by axial compressive tests and electron scanning microscopy (SEM) coupled to energy dispersive X-ray spectrophotometry (EDS), before and after thermal cycling. Thermal cycling procedures were performed at 3000, 6000 and 10000 cycles in Fusayama´s artificial saliva at 5 and 60 oC. Results: An improvement of compressive strength was noticed on glass-ionomer reinforced with alumina fillers in comparison with the commercial glass ionomer. SEM images revealed the morphology and distribution of alumina or zirconia in the microstructure of glass-ionomers. Also, defects such as cracks and pores were detected on the glass-ionomer cements. The materials tested were not affected by thermal cycling in artificial saliva. Conclusion: Addition of inorganic particles at nano-scale such as alumina can increase the mechanical properties of glass-ionomer cements. However, the presence of cracks and pores present in glass-ionomer can negatively affect the mechanical properties of the material because they are areas of stress concentration	pt_BR
dc.identifier.citation	SOUZA, Júlio C. M.; SILVA, Joel B.; ALADIM, Andrea; CARVALHO, Oscar; NASCIMENTO, Rubens M.; SILVA, Filipe S.; MARTINELLI, Antonio E.; HENRIQUES, Bruno. Effect of Zirconia and Alumina Fillers on the Microstructure and Mechanical Strength of Dental Glass Ionomer Cements. The Open Dentistry Journal, [S.L.], v. 10, n. 1, p. 58-68, 15 mar. 2016. Bentham Science Publishers Ltd.. http://dx.doi.org/10.2174/1874210601610010058. Disponível em: https://opendentistryjournal.com/VOLUME/10/PAGE/58/. Acesso em: 20 jan. 2021.	pt_BR
dc.identifier.doi	10.2174/1874210601610010058
dc.identifier.issn	1874-2106
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/31604
dc.language	en	pt_BR
dc.publisher	Bentham Open	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Alumina	pt_BR
dc.subject	Glass-ionomer cement	pt_BR
dc.subject	Strength	pt_BR
dc.subject	Thermal cycling	pt_BR
dc.subject	Zirconia	pt_BR
dc.title	Effect of zirconia and alumina fillers on the microstructure and mechanical strength of dental glass ionomer cements	pt_BR
dc.type	article	pt_BR