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Title: Effect of zirconia and alumina fillers on the microstructure and mechanical strength of dental glass ionomer cements
Authors: Martinelli, Antonio Eduardo
Souza, Júlio C. M.
Silva, Joel B.
Aladim, Andrea
Carvalho, Oscar
Nascimento, Rubens M.
Silva, Filipe S.
Henriques, Bruno
Keywords: Alumina;Glass-ionomer cement;Strength;Thermal cycling;Zirconia
Issue Date: Mar-2016
Publisher: Bentham Open
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.. Disponível em: Acesso em: 20 jan. 2021.
Portuguese Abstract: 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
ISSN: 1874-2106
Appears in Collections:CT - DEMAT - Artigos publicados em periódicos

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