Influence of soft-start curing protocol in the degree of conversion of a nanohybrid resin composite

Autores

  • Heloisa Amorim Periotto Graduate School of Dentistry, University of Fortaleza (UNIFOR)
  • Ana Daielly da Silva Graduate School of Dentistry, University of Fortaleza (UNIFOR)
  • Isabella Saraiva Leão de Resende Nucleus of Study and Research in Dental Biomaterials (NEPBiO), Graduate School of Dentistry, University Center of Christus (UNICHRITUS)
  • Hellen Martins Jucá Nucleus of Study and Research in Dental Biomaterials (NEPBiO), Graduate School of Dentistry, University Center of Christus (UNICHRITUS)
  • Sérgio Lima Santiago Department of Restorative Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará (UFC)
  • Jiovanne Rabelo Neri University of Fortaleza

DOI:

https://doi.org/10.15448/1980-6523.2018.1.29828

Palavras-chave:

composite resins, polymerization, physical properties.

Resumo

OBJECTIVE: To analyze the influence of the soft-start curing protocol in the degree of conversion of a nanohybrid composite.
METHODS: Ten specimens were prepared from the polymerization of the composite resin Llis using two protocols: conventional (1000 mW/cm² for 20 seconds) or gradual (250 mW/cm² for 20 seconds + 1000 mW/cm² for 15 seconds). Then, analyzes were performed using a spectrophotometer and data were subjected to Two-way ANOVA and Holm-Sidak test. The significance level was 5%.
RESULTS: There was no statistical difference between the average resin conversion degree of composite values in the base area and top for both curing protocols (p > 0.05).
CONCLUSION: Therefore, the use of soft-start curing protocol did not interfere in the degree of conversion of a nanohybrid composite.

 

*** Influência do protocolo de fotoativação gradual no grau de conversão de uma resina composta nanohíbrida ***

OBJETIVO: Analisar a influência do protocolo de fotoativação gradual no grau de conversão de uma resina composta nanohíbrida.
METODOLOGIA: Dez espécimes foram confeccionados a partir da polimerização da resina composta Llis, utilizando os seguintes protocolos: convencional (1000 mW/cm², durante 20 segundos) ou gradual (250 mW/cm² durante 20 segundos + 1000 mW/cm² durante 15 segundos). Posteriormente, foram realizadas análises com espectrofotômetro e os dados foram submetidos à análise de variância a dois critérios e o teste de Holm-Sidak. O nível de significância adotado foi 5%.
RESULTADOS: Não houve diferença estatística entre a média dos valores de grau de conversão da resina composta na superfície de topo e de base, para ambos os protocolos de fotoativação (p > 0,05).
CONCLUSÃO: o uso do protocolo de fotoativação gradual não interferiu no grau de conversão de uma resina composta nanohíbrida.

Palavras-chave: resinas compostas; polimerização; propriedades física.

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Publicado

2018-12-30

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Artigo Original