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Mesenchymal stromal cell and osteoblast responses to oxidized titanium surfaces pre-treated with λ = 808 nm GaAlAs diode laser or chlorhexidine: in vitro study

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Abstract

Preservation of implant biocompatibility following peri-implantitis treatments is a crucial issue in odontostomatological practice, being closely linked to implant re-osseointegration. Our aim was to assess the responses of osteoblast-like Saos2 cells and adult human bone marrow-mesenchymal stromal cells (MSCs) to oxidized titanium surfaces (TiUnite®, TiU) pre-treated with a 808 ± 10 nm GaAlAs diode laser operating in non-contact mode, in continuous (2 W, 400 J/cm2; CW) or pulsed (20 kHz, 7 μs, 0.44 W, 88 J/cm2; PW) wave, previously demonstrated to have a strong bactericidal effect and proposed as optional treatment for peri-implantitis. The biocompatibility of TiU surfaces pre-treated with chlorhexidine digluconate (CHX) was also evaluated. In particular, in order to mimic the in vivo approach, TiU surfaces were pre-treated with CHX (0.2%, 5 min); CHX and rinse; and CHX, rinse and air drying. In some experiments, the cells were cultured on untreated TiU before being exposed to CHX. Cell viability (MTS assay), proliferation (EdU incorporation assay; Ki67 confocal immunofluorescence analysis), adhesion (morphological analysis of actin cytoskeleton organization), and osteogenic differentiation (osteopontin confocal immunofluorescence analysis; mineralized bone-like nodule formation) analyses were performed. CHX resulted cytotoxic in all experimental conditions. Diode laser irradiation preserved TiU surface biocompatibility. Notably, laser treatment appeared even to improve the known osteoconductive properties of TiU surfaces. Within the limitations of an in vitro experimentation, this study contributes to provide additional experimental basis to support the potential use of 808 ± 10 nm GaAlAs diode laser at the indicated irradiation setting, in the treatment of peri-implantitis and to discourage the use of CHX.

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Acknowledgements

The authors are grateful to Dr. Benedetta Mazzanti (Department of Experimental and Clinical Medicine—Section of Hematology, University of Florence) for providing the human bone marrow MSCs and critically revising the experimental design and manuscript. The titanium discs were kindly provided by Nobel Biocare (Göteborg, Sweden) and Dental Laser System 4 × 4™ laser by General Project, Italy.

Author information

Correspondence to Chiara Sassoli.

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Conflict of interest

The authors declare that they have not conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Local Ethical Committee approval no. prot. 23/2007 was obtained for isolation and collection of bone marrow-derived mesenchymal stromal cells.

Informed consent

Informed written consent was signed by all bone marrow donors.

Funding

This study was supported by Odontostomatologic Laser Therapy Center Via dell’ Olivuzzo 162, 50143, Florence, Italy and by grants from MIUR (Ministero dell’Istruzione dell’Università e della Ricerca—ex Ateneo 60%)—Italy to CS, DN, SZO.

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Cite this article

Chellini, F., Giannelli, M., Tani, A. et al. Mesenchymal stromal cell and osteoblast responses to oxidized titanium surfaces pre-treated with λ = 808 nm GaAlAs diode laser or chlorhexidine: in vitro study. Lasers Med Sci 32, 1309–1320 (2017) doi:10.1007/s10103-017-2243-5

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Keywords

  • Osteoblasts
  • Mesenchymal stromal cells
  • Titanium dental implant
  • Diode laser therapy
  • Peri-implantitis
  • Chlorhexidine