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Ceramics-Silikáty 56, (4) 323 - 330 (2012) |
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LASER-INDUCED BIOACTIVITY IN DENTAL PORCELAIN MODIFIED BY BIOACTIVE GLASS
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Beketova Anastasia 1, Manda Marianthi 1, Charoulis Demetrios 1,
Christofilos Dimitris 2,
Papadopoulou Lambrimi 3,
Goudouri Ourania-Menti 4,
Polychroniadis Efstathios 4,
Paraskevopoulos Konstantinos M. 4,
Koidis Petros 1
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1 Department of Fixed Prosthesis and Implant Prosthodontics, Dentistry School, Aristotle University of Thessaloniki,
University Campus, Dentistry Building, GR 54124, Thessaloniki, Greece
2 Physics Division, School of Technology, Aristotle University of Thessaloniki,
University Campus, GR 54124, Thessaloniki, Greece
3 School of Geology, Aristotle University of Thessaloniki, University Campus, GR 54124, Thessaloniki, Greece
4 Physics Department, Aristotle University of Thessaloniki, University Campus, GR 54124, Thessaloniki, Greece
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Keywords: Laser-liquid-solid interaction, Bioactive glass, Ceramics, Nano-hydroxyapatite, Bioactivity
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The aim of this study was to investigate the impact of laser-liquid-solid interaction method in the bioactivity of dental porcelain
modified by bioactive glass. Forty sol-gel derived specimens were immersed in Dulbecco's Modified Eagle's Medium, 31 and
9 specimens of which were treated with Er:YAG and Nd:YAG laser respectively. Untreated specimens served as controls.
Incubation of specimens followed. Bioactivity was evaluated, using Fourier Transform Infrared spectroscopy (FTIR), Scanning
Electron Microscopy (SEM)/Energy Dispersive Spectroscopy (EDS) and Transmission Electron Microscopy (TEM). FTIR
detected peaks associated with hydroxyapatite on 1 Nd:YAG- and 4 Er:YAG-treated specimens. SEM analysis revealed that
Er:YAG-treated specimens were covered by granular hydroxyapatite layer, while Nd:YAG treated specimen presented growth
of flake-like hydroxyapatite. TEM confirmed the results. The untreated controls presented delayed bioactivity. In conclusion,
Nd:YAG and Er:YAG laser treatment of the material, under certain fluencies, accelerates hydroxyapatite formation. Nd:YAG
laser treatment of specific parameters causes the precipitation of flake-like hydroxyapatite in nano-scale. |
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