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Post-irradiation hardness development, chemical softening, and thermal stability of bulk-fill and conventional resin-composites

Alshali, Ruwaida Z ; Salim, Nesreen A ; Satterthwaite, Julian D ; Silikas, Nick

Journal of dentistry, 2015-02, Vol.43 (2), p.209-218 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    Post-irradiation hardness development, chemical softening, and thermal stability of bulk-fill and conventional resin-composites
  • Autor: Alshali, Ruwaida Z ; Salim, Nesreen A ; Satterthwaite, Julian D ; Silikas, Nick
  • Assuntos: Analysis of variance ; Bisphenol A ; Bulk-fill ; Composite materials ; Composite Resins - chemistry ; Cross-link density ; Curing ; Decomposition ; Dental Materials - chemistry ; Dentistry ; Drying ; Ethanol ; Ethyl alcohol ; Fillers ; Hardness ; Light ; Materials Testing ; Microhardness ; Moisture absorption ; Polymerization ; Post-irradiation ; Resin-composite ; Resins, Synthetic - chemistry ; Softening ; Solvents ; Studies ; Temperature ; Thermal decomposition ; Thermogravimetric analysis ; Thermogravimetry
  • É parte de: Journal of dentistry, 2015-02, Vol.43 (2), p.209-218
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Abstract Objectives To measure bottom/top hardness ratio of bulk-fill and conventional resin-composite materials, and to assess hardness changes after dry and ethanol storage. Filler content and kinetics of thermal decomposition were also tested using thermogravimetric analysis (TGA). Methods Six bulk-fill (SureFil SDR, Venus bulk fill, X-tra base, Filtek bulk fill flowable, Sonic fill, and Tetric EvoCeram bulk-fill) and eight conventional resin-composite materials (Grandioso flow, Venus Diamond flow, X-flow, Filtek Supreme Ultra Flowable, Grandioso, Venus Diamond, TPH Spectrum, and Filtek Z250) were tested ( n = 5). Initial and 24 h (post-cure dry storage) top and bottom microhardness values were measured. Microhardness was re-measured after the samples were stored in 75% ethanol/water solution. Thermal decomposition and filler content were assessed by TGA. Results were analysed using one-way ANOVA and paired sample t -test ( α = 0.05). Results All materials showed significant increase of microhardness after 24 h of dry storage which ranged from 100.1% to 9.1%. Bottom/top microhardness ratio >0.9 was exhibited by all materials. All materials showed significant decrease of microhardness after 24 h of storage in 75% ethanol/water which ranged from 14.5% to 74.2%. The extent of post-irradiation hardness development was positively correlated to the extent of ethanol softening ( R2 = 0.89, p < 0.001). Initial thermal decomposition temperature assessed by TGA was variable and was correlated to ethanol softening. Conclusions Bulk-fill resin-composites exhibit comparable bottom/top hardness ratio to conventional materials at recommended manufacturer thickness. Hardness was affected to a variable extent by storage with variable inorganic filler content and initial thermal decomposition shown by TGA. Clinical significance The manufacturer recommended depth of cure of bulk-fill resin-composites can be reached based on the microhardness method. Characterization of the primary polymer network of a resin-composite material should be considered when evaluating its stability in the aqueous oral environment.
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês;Persa
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