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首页> 外文会议>Conference on Lasers in Dentistry; 20080120; San Jose,CA(US) >Nanomechanical Properties of Dentin Treated with a CO_2 Laser for Potential Caries Inhibition
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Nanomechanical Properties of Dentin Treated with a CO_2 Laser for Potential Caries Inhibition

机译：用CO_2激光处理的牙本质抑制龋齿的纳米力学性能。

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The effect of pulsed CO_2-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_2 laser at fluences of 0.5; 0.75; 1.0; and 1.5 J/cm~2 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~2 were determined. The hypothesis that CO_2-laser-treatments reduce or inhibit the demineralization process was tested. Surface cracks were observed at fluences of 0.75 J/cm~2 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~2. While increased properties were still observed in the laser affected surface zone for treatments at 1.5 J/cm~2, 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_2-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.
机译：利用原子力显微镜和纳米压痕技术研究了脉冲CO_2激光处理对显微组织和纳米力学性能的影响。 9.3μmCO_2激光以0.5的注量处理牙本质标本的显微结构和粗糙度； 0.75； 1.0;分别评估了1.5J / cm 2和1.5J / cm 2的弹性模量和硬度，并确定了在0.75和1.5J / cm 2的激光处理的9天demin / remin施加之前和之后的弹性模量和硬度。测试了CO_2激光处理减少或抑制脱盐过程的假设。在0.75 J / cm〜2或更高的注量下观察到表面裂纹。激光辐照后，表面粗糙度大大增加，在最大通量下约高10倍。从激光处理过的表面到声音好的牙本质的机械性能曲线显示，在经过处理的牙本质表面上的模量和硬度值增加，表明通过增加矿物质含量去除了有机相并增强了组织。在所有组中，在进行脱皮/脱皮处理后，机械性能均下降，而以0.75 J / cm〜2处理的样品的硬化表面层消失。虽然在1.5 J / cm〜2的激光影响的表面区域中仍观察到了增强的性能，但这些层下方的脱盐作用却很严重，这表明性能急剧下降。与未处理的对照组相比，激光处理组的脱矿质深度略有减少。我们得出结论，CO_2激光治疗产生的牙本质表面具有增加的纳米机械性能。但是，由于表面开裂和可能的分层，这些表面层不能防止脱矿质。此外，由激光辐照引起的表面裂纹引起人们对抑制牙本质中龋齿的临床潜力的关注。

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