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- W2024055826 abstract "The effect of pulsed CO<sub>2</sub>-laser treatments on the microstructure and nanomechanical properties was studied using atomic force microscopy and nanoindentation. The microstructure and roughness of dentin specimens treated by a 9.3 μm CO<sub>2</sub> laser at fluences of 0.5; 0.75; 1.0; and 1.5 J/cm<sup>2</sup> were evaluated and the elastic modulus and hardness before and after a nine days demin/remin application for laser treatments at 0.75 and 1.5 J/cm<sup>2</sup> were determined. The hypothesis that CO<sub>2</sub>-laser-treatments reduce or inhibit the demineralization process was tested. Surface cracks were observed at fluences of 0.75 J/cm<sup>2</sup> and higher. Surface roughness increased strongly after laser irradiation and was about 10 times higher at maximum fluence. Mechanical properties profiles from the laser treated surface to sound dentin showed increased modulus and hardness values at dentin surfaces treated, indicating removal of organic phases and reinforcement of the tissue by increased mineral content. Mechanical properties decreased after demin/remin application in all groups and the hardened surface layer disappeared for samples treated at 0.75 J/cm<sup>2</sup>. While increased properties were still observed in the laser affected surface zone for treatments at 1.5 J/cm<sup>2</sup>, demineralization was severe underneath these layers as indicated by a sharp drop in properties. The depth of demineralization was slightly decreased in the laser-treated group compared to the untreated controls. We conclude that CO<sub>2</sub>-laser treatments produce dentin surfaces with increased nanomechanical properties. These surface layers do not, however, provide protection against demineralization due to surface cracking and possible delamination. Moreover, the surface cracks induced by the laser-irradiation raise concerns about a clinical potential for caries inhibition in dentin." @default.
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- W2024055826 date "2008-02-07" @default.
- W2024055826 modified "2023-09-23" @default.
- W2024055826 title "Nanomechanical properties of dentin treated with a CO 2 laser for potential caries inhibition" @default.
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- W2024055826 doi "https://doi.org/10.1117/12.778796" @default.
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