Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/16550
Tipo do documento: Artigo
Título: Pre-heating mitigates composite degradation
Autor: Silva, Jessika Calixto da
Reges, Rogério Vieira
Rege, Inara Carneiro Costa
Cruz, Carlos Alberto dos Santos
Vaz, Luis Geraldo
Estrela, Carlos
Castro, Fabrício Luscino Alves de
Abstract: D ental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives: This study evaluated the effect of pre- heating on the degradation of composites, based on the analysis of radiopacity and silver penetration using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS). Material and Methods: Thirty specimens were fabricated using a metallic matri[ ( [ mm) and the composites Dura¿ll 9S (+eraeus .ul]er), =- ( M/ESPE), and Z-350 (3M/ESPE), cured at 25°C (no pre-heating) or 60°C (pre-heating). Specimens were stored sequentially in the following solutions: 1) water for 7 days (60°C), plus 0.1 N sodium hydroxide (NaOH) for 14 days (60°C); 2) 50% silver nitrate (AgNO 3 ) for 10 days (60°C). Specimens were radiographed at baseline and after each storage time, and the images were evaluated in gray scale. After the storage protocol, samples were analyzed using SEM/EDS to check the depth of silver penetration. Radiopacity and silver penetration data were analyzed using ANOVA and Tukey’s tests (D=5%). Results: Radiopacity levels were as follows: Dura¿ll VS Z-350 Z-250 (p 0.05). The depth of silver penetration into the composites ranked as follows: Dura¿ll VS!Z-350!Z-250 (p 0.05). After storage in water/ NaOH, pre-heated specimens presented higher radiopacity values than non-pre-heated specimens (p<0.05). There was a lower penetration of silver in pre-heated specimens (p<0.05). Conclusions: Pre-heating at 60°C mitigated the degradation of composites based on analysis of radiopacity and silver penetration depth.
Palavras-chave: Composite resins
Scanning electron microscopy
Hot temperature
Silver nitrate
Radiography
País: Brasil
Unidade acadêmica: Faculdade de Odontologia - FO (RG)
Citação: SILVA, Jessika Calixto da et al. Pre-heating mitigates composite degradation. Journal of Applied Oral Science, Bauru, v. 23, n. 6, p. 571-579, 2015.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1590/1678-775720150284
Identificador do documento: 10.1590/1678-775720150284
URI: http://repositorio.bc.ufg.br/handle/ri/16550
Data de publicação: 2015
Aparece nas coleções:FM - Artigos publicados em periódicos

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