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Effect of treated filler loading on the photopolymerization inhibition and shrinkage of a dimethacrylate matrix

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Abstract

This study shows how treated filler loading influences the photopolymerization of a dimethacrylate comonomer mixture, regarding, in particular, shrinkage and inhibition under atmospheric oxygen, present in oral environment. Bis-GMA/TEGDMA (75/25 wt.%) resins were loaded with hybrid filler (Ba aluminosilicate glass and pyrogenic silica), treated with γ-methacryloxy(propyl)trimethoxysilane, at 0–50 wt.% and light cured over a total of 30 s (45 mW/cm2). Degree of double-bond conversion (DC), obtained using FTIR, decreased with filler content. 1H MAS spectra (293–340 K) and STRAFI images (293 K) were obtained as a function of irradiation time and filler concentration. 1H signals of unreacted methacrylate groups were more intense for higher loaded resins and resonances from –CH2SiO2(OH) (T2) and –CH2SiO3– (T3) units, also observed by 29Si NMR, were resolved and suggest the presence of T2–resin bonds. 1D images show a reduction on polymerization contraction and reaction inhibition at the composite resin surface with filler loading. 2D resin images present a highly mobile surface layer, hence with lower DC.

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Acknowledgements

This work was supported by the Portuguese Foundation for Science and Technology (Grant: PRAXIS/BD/20066/99 and SFRH/BPD/25112/2005 and Projects: POCTI/33193/99 and PDCT/55395/04). The authors wish to thank KERR (USA) for kindly providing the filler.

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Authors and Affiliations

  1. Departamento de Engenharia de Materiais/IST, Univ. Técnica de Lisboa, Av.Rovisco Pais 1, Lisboa, 1049-001, Portugal

    T. G. Nunes & S. G. Pereira

  2. Dental Research Center, University of North Carolina COSD, Chapel Hill, NC, USA

    S. Kalachandra

Authors
  1. T. G. Nunes
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  2. S. G. Pereira
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  3. S. Kalachandra
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Correspondence to T. G. Nunes.

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Nunes, T.G., Pereira, S.G. & Kalachandra, S. Effect of treated filler loading on the photopolymerization inhibition and shrinkage of a dimethacrylate matrix. J Mater Sci: Mater Med 19, 1881–1889 (2008). https://doi.org/10.1007/s10856-007-3247-7

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  • DOI: https://doi.org/10.1007/s10856-007-3247-7

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