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Pre-heating mitigates composite degradation

Silva, Jessika Calixto da ; Rogério Vieira, Reges ; Rege, Inara Carneiro Costa ; Cruz, Carlos Alberto dos Santos ; Vaz, Luís Geraldo ; Estrela, Carlos ; Castro, Fabrício Luscino Alves de

Journal of applied oral science, 2015-11, Vol.23 (6), p.571-579 [Periódico revisado por pares]

Brazil: Faculdade de Odontologia de Bauru da Universidade de São Paulo

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Título:
Pre-heating mitigates composite degradation
Autor: Silva, Jessika Calixto da ; Rogério Vieira, Reges ; Rege, Inara Carneiro Costa ; Cruz, Carlos Alberto dos Santos ; Vaz, Luís Geraldo ; Estrela, Carlos ; Castro, Fabrício Luscino Alves de
Assuntos: Analysis of Variance ; Composite resins ; Composite Resins - chemistry ; Dentistry ; DENTISTRY, ORAL SURGERY & MEDICINE ; Heating - methods ; Hot Temperature ; Materials Testing ; Microscopy, Electron, Scanning ; Original ; Radiography ; Reference Values ; Scanning electron microscopy ; Silver - chemistry ; Silver nitrate ; Spectrometry, X-Ray Emission ; Surface Properties ; Time Factors ; Water - chemistry
É parte de: Journal of applied oral science, 2015-11, Vol.23 (6), p.571-579
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Dental 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 matrix (2x8 mm) and the composites Durafill VS (Heraeus Kulzer), Z-250 (3M/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 (AgNO3) 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 (α=5%). Results Radiopacity levels were as follows: Durafill VSZ-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.
Editor: Brazil: Faculdade de Odontologia de Bauru da Universidade de São Paulo
Idioma: Inglês;Português

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Pre-heating mitigates composite degradation

Silva, Jessika Calixto da ; Rogério Vieira, Reges ; Rege, Inara Carneiro Costa ; Cruz, Carlos Alberto dos Santos ; Vaz, Luís Geraldo ; Estrela, Carlos ; Castro, Fabrício Luscino Alves de

Brazil: Faculdade de Odontologia de Bauru da Universidade de São Paulo

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