Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Cap. Francisco Pedro S/N - Rodolfo Teófilo, 60430-170, Fortaleza, CE, Brazil.
Lasers Med Sci. 2011 Sep;26(5):615-21. doi: 10.1007/s10103-010-0865-y. Epub 2010 Nov 20.
Increasing rates of non-carious cervical lesions due to dental erosion, exposure of dentinal tubules, and hypersensitivity to environmental stimuli have led to the development of new prevention strategies. This study evaluated the effects of a low-intensity diode laser (λ = 808 nm) on the dentinal chemical composition and prevention of demineralization. In addition, the study monitored temperature changes during the course of irradiation. Forty dentin specimens were randomly allocated into four groups (n = 10): G1 - No treatment (control), G2 - irradiated with 15 J/cm(2), G3 - irradiated with 30 J/cm(2), and G4 - irradiated with 60 J/cm(2). Each specimen was partially covered with nail varnish, treated according to the group irradiation levels, and exposed to an erosive challenge (1.0 M hydrochloric acid) for 5 min. Afterwards, dentin loss was profilometrically analyzed and examined by scanning electron microscopy (SEM) combined with energy dispersive X-ray (EDX). Intrapulpal temperatures were measured during the dentin irradiation. One-way ANOVA and Tukey tests (p < 0.05) were performed to assess differences. For all irradiated groups, intrapulpal temperature changes were less than 3°C. The G2 group showed statistically significant differences when compared to the other groups, representing the lowest temperature increase. A quantitative element analysis via EDX did not significantly differ (p < 0.05) for Ca, P, F, O, or C between the four groups when measured after irradiation/erosion. The mean wear rates (± SD, μm) were 35.66 ± 7.28; 40.70 ± 5.03; 38.17 ± 10.81 and 25.25 ± 6.87 for G1-G4, respectively. The G4 group statistically differed from all other groups representing the lowest wear rate. These results suggest that dentin irradiation, using a diode laser with levels set at 60 J/cm(2), may induce inhibitory effects on root dentin demineralization without causing any harmful thermal effects. However, the exact mechanism of the action of the laser remains unclear.
由于牙齿酸蚀、牙本质小管暴露和对环境刺激的过敏反应导致非龋性颈段缺损的发生率不断增加，因此开发了新的预防策略。本研究评估了低强度二极管激光（λ = 808nm）对牙本质化学成分和预防脱矿的影响。此外，该研究还监测了照射过程中的温度变化。将 40 个牙本质样本随机分为四组（n = 10）：G1-无处理（对照），G2-照射 15J/cm2，G3-照射 30J/cm2，G4-照射 60J/cm2。每个样本的一部分用指甲油覆盖，根据组照射水平进行处理，并暴露于腐蚀性挑战（1.0M 盐酸）中 5 分钟。然后，通过轮廓测量分析和扫描电子显微镜（SEM）结合能量色散 X 射线（EDX）检查牙本质损失。在牙本质照射过程中测量牙髓内温度。采用单向方差分析和 Tukey 检验（p < 0.05）评估差异。所有照射组的牙髓内温度变化均小于 3°C。与其他组相比，G2 组的温度升高有统计学意义，代表最低的温度升高。通过 EDX 进行的定量元素分析显示，照射/腐蚀后，Ca、P、F、O 或 C 四种元素在四组之间无显著差异（p < 0.05）。G1-G4 的平均磨损率（±SD，μm）分别为 35.66 ± 7.28、40.70 ± 5.03、38.17 ± 10.81 和 25.25 ± 6.87。G4 组与其他所有组均有统计学差异，代表最低的磨损率。这些结果表明，使用二极管激光（设置为 60J/cm2）照射牙本质可能会对根牙本质脱矿产生抑制作用，而不会产生任何有害的热效应。然而，激光作用的确切机制尚不清楚。
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