0.355、2.94和9.4微米波长的激光对牙釉质和牙本质表面进行多波长照射对表面形态、渗透性和耐酸性的影响。
Influence of multi-wavelength laser irradiation of enamel and dentin surfaces at 0.355, 2.94, and 9.4 μm on surface morphology, permeability, and acid resistance.
作者信息
Chang Nai-Yuan N, Jew Jamison M, Simon Jacob C, Chen Kenneth H, Lee Robert C, Fried William A, Cho Jinny, Darling Cynthia L, Fried Daniel
机构信息
Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, California 94143.
出版信息
Lasers Surg Med. 2017 Dec;49(10):913-927. doi: 10.1002/lsm.22700. Epub 2017 Jul 12.
OBJECTIVE
Ultraviolet (UV) and infrared (IR) lasers can be used to specifically target protein, water, and mineral, respectively, in dental hard tissues to produce varying changes in surface morphology, permeability, reflectivity, and acid resistance. The purpose of this study was to explore the influence of laser irradiation and topical fluoride application on the surface morphology, permeability, reflectivity, and acid resistance of enamel and dentin to shed light on the mechanism of interaction and develop more effective treatments.
METHODS
Twelve bovine enamel surfaces and twelve bovine dentin surfaces were irradiated with various combinations of lasers operating at 0.355 (Freq.-tripled Nd:YAG (UV) laser), 2.94 (Er:YAG laser), and 9.4 μm (CO laser), and surfaces were exposed to an acidulated phosphate fluoride gel and an acid challenge. Changes in the surface morphology, acid resistance, and permeability were measured using digital microscopy, polarized light microscopy, near-IR reflectance, fluorescence, polarization sensitive-optical coherence tomography (PS-OCT), and surface dehydration rate measurements.
RESULTS
Different laser treatments dramatically influenced the surface morphology and permeability of both enamel and dentin. CO laser irradiation melted tooth surfaces. Er:YAG and UV lasers, while not melting tooth surfaces, showed markedly different surface roughness. Er:YAG irradiation led to significantly rougher enamel and dentin surfaces and led to higher permeability. There were significant differences in acid resistance among the various treatment groups.
CONCLUSION
Surface dehydration measurements showed significant changes in permeability after laser treatments, application of fluoride and after exposure to demineralization. CO laser irradiation was most effective in inhibiting demineralization on enamel while topical fluoride was most effective for dentin surfaces. Lasers Surg. Med. 49:913-927, 2017. © 2017 Wiley Periodicals, Inc.
目的
紫外线（UV）激光和红外线（IR）激光可分别用于特异性靶向牙体硬组织中的蛋白质、水和矿物质，从而使表面形态、渗透性、反射率和耐酸性产生不同变化。本研究的目的是探讨激光照射和局部应用氟化物对牙釉质和牙本质的表面形态、渗透性、反射率和耐酸性的影响，以阐明相互作用机制并开发更有效的治疗方法。
方法
用波长为0.355（三倍频Nd:YAG（UV）激光）、2.94（Er:YAG激光）和9.4μm（CO激光）的不同组合激光照射12个牛牙釉质表面和12个牛牙本质表面，并将这些表面暴露于酸性磷酸氟凝胶和酸蚀环境中。使用数字显微镜、偏光显微镜、近红外反射、荧光、偏振敏感光学相干断层扫描（PS-OCT）和表面脱水率测量等方法来测量表面形态、耐酸性和渗透性的变化。
结果
不同的激光处理对牙釉质和牙本质的表面形态和渗透性均有显著影响。CO激光照射使牙齿表面熔化。Er:YAG激光和UV激光虽未使牙齿表面熔化，但显示出明显不同的表面粗糙度。Er:YAG激光照射导致牙釉质和牙本质表面明显更粗糙，并导致更高的渗透性。各治疗组之间的耐酸性存在显著差异。
结论
表面脱水测量显示，激光处理、应用氟化物以及暴露于脱矿环境后，渗透性有显著变化。CO激光照射在抑制牙釉质脱矿方面最有效，而局部应用氟化物对牙本质表面最有效。《激光外科与医学》49:913 - 927，2017年。©2017威利期刊公司。
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