Mechanical strength and wear of dental glass-ionomer and resin composites affected by porosity and chemical composition

Rodrigues, Daniela S.; Buciumeanu, Mihaela; Martinelli, Antonio Eduardo; Nascimento, Rubens Maribondo do; Henriques, Bruno; Silva, Filipe Samuel; Souza, Júlio César Matias de

Mechanical strength and wear of dental glass-ionomer and resin composites affected by porosity and chemical composition

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dc.contributor.author	Rodrigues, Daniela S.
dc.contributor.author	Buciumeanu, Mihaela
dc.contributor.author	Martinelli, Antonio Eduardo
dc.contributor.author	Nascimento, Rubens Maribondo do
dc.contributor.author	Henriques, Bruno
dc.contributor.author	Silva, Filipe Samuel
dc.contributor.author	Souza, Júlio César Matias de
dc.date.accessioned	2020-03-31T19:06:53Z
dc.date.available	2020-03-31T19:06:53Z
dc.date.issued	2015-08-13
dc.description.resumo	The main aim of this study was to evaluate the influence of porosity, microstructure, and chemical composition on the wear and compressive strength of dental glass-ionomer or resin composite. Cylindrical samples (6 9 4 mm) were prepared from a nano-hybrid resin composite (GrandioSO/RC, VOCO), a resin-modified glass ionomer (VitremerTM/VI, 3 M-ESPE) and a conventional glass ionomer (IonofilMolar/CO, VOCO). Porosity and topography of the materials were evaluated by optical and scanning electron microscopy (SEM). Roughness was evaluated by Ra and Rt parameters at 0.1 mm/s under cutoff of 0.8 mm. Then, compressive tests were performed at 1 mm/min. Wear tests were carried out at 20 N, 2.5 mm of displacement, at 1 Hz for 90 min in artificial saliva solution. The results were statistically analyzed with a one-way ANOVA and Tukey’s test (p\0.05). Resin composite revealed a significantly lower porosity (1.21 ± 0.20 %) than glass-ionomer restoratives (5.69–7.54 %) as well as lower values of Ra and Rt roughness (p\0.05). Also, resin composite showed significantly higher values of mechanical strength (334 ± 15.9 MPa) compared to conventional (78.78 ± 13.30 MPa) or modified glass ionomer (169.50 ± 20.98 MPa) (p\0.05). For maximal depth of wear, resin composite also showed significantly lower values than glass ionomer (p\0.05). Homogeneous wear morphology was noticed by SEM analyses on glass ionomers in opposition to resin composite. Glass ionomers showed a poor mechanical behavior associated to a high porosity and wear rate when compared to resin composite.	pt_BR
dc.identifier.citation	RODRIGUES, Daniela S.; BUCIUMEANU, Mihaela; MARTINELLI, Antonio E.; NASCIMENTO, Rubens M.; HENRIQUES, Bruno; SILVA, Filipe S.; SOUZA, Júlio C. M. Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition. Journal of Bio- and Tribo-Corrosion, v. 1, p. 1-9, 2015. ISSN 2198-4239 versão online. DOI 10.1007/s40735-015-0025-9. Disponível em: https://link.springer.com/article/10.1007/s40735-015-0025-9. Acesso em: 31 mar. 2020.	pt_BR
dc.identifier.issn	2198-4239
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/28690
dc.language	en	pt_BR
dc.publisher	Springer Link	pt_BR
dc.subject	Glass-ionomer	pt_BR
dc.subject	Resin composite	pt_BR
dc.subject	Compressive strength	pt_BR
dc.subject	Porosity	pt_BR
dc.subject	Microstructure	pt_BR
dc.subject	Wear	pt_BR
dc.title	Mechanical strength and wear of dental glass-ionomer and resin composites affected by porosity and chemical composition	pt_BR
dc.type	article	pt_BR