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CO2 laser improves 45S5 bioglass interaction with dentin.

A S Bakry1, H Takahashi, M Otsuki

  • 1Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. drahmedbakry@gmail.com.

Journal of Dental Research
|November 19, 2010
PubMed
Summary

Bioglass 45S5 effectively occludes dentinal tubules with calcium-phosphate crystals, potentially treating dentin hypersensitivity. Carbon dioxide (CO(2)) laser irradiation may enhance the mechanical properties of this bioactive layer.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Regenerative Dentistry

Background:

  • Bioglass 45S5 forms a calcium-phosphate layer on mineralized tissues.
  • Dentin hypersensitivity is a common clinical condition.
  • Novel biomaterials are sought for dentin hypersensitivity treatment.

Purpose of the Study:

  • To investigate the efficacy of Bioglass 45S5, combined with phosphoric acid and CO(2) laser irradiation, in treating dentin hypersensitivity.
  • To characterize the chemical and micro-morphological changes on dentinal surfaces.
  • To evaluate the mechanical properties of the resulting layer.

Main Methods:

  • Preparation of Bioglass 45S5-phosphoric acid mixture.
  • CO(2) laser irradiation of dentinal surfaces.

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  • Analysis using Field Emission Scanning Electron Microscopy (FE-SEM) with Energy-Dispersive X-ray Spectroscopy (EDS).
  • X-ray Diffraction (XRD) for crystalline structure analysis.
  • Nanoindentation for mechanical property assessment.

    • Main Results:

    • Bioglass 45S5 successfully occluded dentinal tubule orifices with calcium-phosphate crystals.
    • FE-SEM and EDS confirmed the formation of a mineralized layer.
    • XRD identified the crystalline phases present.
    • Nanoindentation indicated potential improvement in the mechanical organization of the crystals upon CO(2) laser application.

    Conclusions:

    • Bioglass 45S5 shows promise as a therapeutic agent for dentin hypersensitivity by occluding dentinal tubules.
    • CO(2) laser irradiation may enhance the mechanical stability of the bioactive layer.
    • Further in vivo studies are warranted to confirm clinical efficacy.