Bevilácqua Flávia M, Zezell Denise Maria, Magnani Romeu, da Ana Patricia A, Eduardo Carlos de Paula
Laboratório Especial de Laser em Odontologia (LELO), Faculdade de Odontologia, Universidade de São Paulo, São Paulo, Brazil.
Lasers Med Sci. 2008 Apr;23(2):141-7. doi: 10.1007/s10103-007-0466-6. Epub 2007 Sep 26.
This study evaluated the resistance to demineralization and fluoride incorporation of enamel irradiated with Er:YAG. A total of 110 bovine teeth were selected and divided into eight groups: unlased, 37% phosphoric acid, and samples irradiated with the Er:YAG laser at several fluences (31.84 J/cm(2), 25.47 J/cm(2), 19.10 J/cm(2), 2.08 J/cm(2), 1.8 J/cm(2), and 0.9 J/cm(2)). The application of acidulated phosphate fluoride was performed after treatments. All samples were immersed in 2 ml of 2.0 M acetic-acetate acid solution at pH 4.5 for 8 h, and fluoride, calcium, and phosphorus ions dissolved were analyzed by atomic absorption spectrometry and spectrophotometry. The phosphoric acid and 31.84 J/cm(2) groups presented the lowest dissolution of calcium and phosphorus ions. Higher fluoride incorporation was observed on 1.8 J/cm(2) and 0.9 J/cm(2) groups. Based on these results, Er:YAG laser was able to decrease acid dissolution and increase fluoride uptake and can be a promissory alternative for preventive dentistry.
本研究评估了铒激光（Er:YAG）照射对牙釉质抗脱矿及氟摄入的影响。共选取110颗牛牙并分为八组：未照射组、37%磷酸组以及用不同能量密度（31.84 J/cm²、25.47 J/cm²、19.10 J/cm²、2.08 J/cm²、1.8 J/cm²和0.9 J/cm²）的铒激光照射的样本组。处理后应用含氟磷酸。所有样本均浸入2毫升pH值为4.5的2.0 M乙酸 - 乙酸盐溶液中8小时，通过原子吸收光谱法和分光光度法分析溶解的氟、钙和磷离子。磷酸组和31.84 J/cm²组的钙和磷离子溶解量最低。在1.8 J/cm²和0.9 J/cm²组中观察到较高的氟摄入。基于这些结果，铒激光能够减少酸溶解并增加氟摄取，可成为预防牙科的一种有前景的替代方法。
