Acid resistance of enamel by carbon dioxide laser irradiation

从预防牙科的角度来看，提高牙釉质的耐酸性是一项非常重要的课题。长期以来，龋齿研究人员对此进行了大量的研究。由于我们最近已能在牙科诊所使用一些激光或新发展的重要牙齿漂白方法，我们可以探讨预防蛀牙的不同方法。然而，单纯用CO_2激光提高牙釉质的耐酸性能时，由于高功率能量，牙釉质表面会发生颜色变化。因此，这一系列研究的目的是阐明CO_2激光在牙釉质表面获得耐酸性的更有效和安全的使用方法。此外，我们将注意力集中在差色度计上，因为它可以轻松快速地确定牙釉质脱钙的程度。其基础研究和临床应用具有可行性。用比色仪评价耐酸性时，乳酸与Λ Y与钙洗脱的相关性优于磷酸。氟处理后的牙釉质的Λ Y值低于未加氟的牙釉质。实验含氟膏剂与CO_2激光在超脉冲模式下同时使用，可以更有效、更安全地提高牙釉质表面的耐酸性能。漂白后的牙釉质易脱钙，但漂白后的氟化物可恢复成同等程度的完好牙釉质。用氟化物和CO_2激光同时处理漂白后的牙釉质，其耐酸性能明显优于纯牙釉质。结果表明，波长8.5 μm的FEL对齿结构的破坏较小。

From a point of view of preventive dentistry, it is very important subject to improve acid resistance of enamel. The researchers connected with dental caries have investigated a lot about this project for a long time. As we have been able to use some kinds of lasers or newly developed vital tooth bleaching method in the dental clinic recently, we can examine the different approach to caries prevention. However, when we tried to improve the acid resistance of enamel with CO_2 laser alone, the irradiated enamel surface would change the color because of high power energy. Therefore, the purpose of the series of these studies were to clarify more effective as well as safety use of the CO_2 laser for acquiring the acid resistance with respect to enamel surface. Moreover, we focused our attention on a differential colorimeter as it enables easy and rapid determination of the degree of enamel decalcification. And its fundamental research and clinical application may be feasible.1. For the evaluation of acid resistance with colorimeter, the lactic acid showed a better correlation between Λ Y and calcium elution than phosphoric acid. Fluoride applied enamel showed less value of Λ Y than without fluoride.2. The simultaneous use of experimental fluorine-containing paste and CO_2 laser in super-pulse mode could improve the acid resistance of the enamel surface more effectively and safely.3. Bleached enamel was decalcified easily, but fluoride treated after bleaching was recovered as same degree of sound enamel.4. The acid resistance of enamel was more recovered by simultaneous using fluoride and CO_2 laser after bleaching than that of sound enamel.5. It was implicated that the wavelength 8.5 μm of FEL showed less damageable to tooth structure.