Turrioni Ana Paula S, Alonso Juliana R L, Basso Fernanda G, Moriyama Lilian T, Hebling Josimeri, Bagnato Vanderlei S, De Souza Costa Carlos A
Am J Dent. 2013 Dec;26(6):319-23.
To evaluate the transdentinal light attenuation of LED at three wavelengths through different dentin thicknesses, simulating cavity preparations of different depths.
Forty-two dentin discs of three thicknesses (0.2, 0.5 and 1 mm; n = 14) were prepared from the coronal dentin of extracted sound human molars. The discs were illuminated with a LED light at three wavelengths (450+/-10 nm, 630 +/-10 nm and 850 +/-10 nm) to determine light attenuation. Light transmittance was also measured by spectrophotometry.
In terms of minimum (0.2 mm) and maximum (1.0 mm) dentin thicknesses, the percentage of light attenuation varied from 49.3% to 69.9% for blue light, 42.9% to 58.5% for red light and 39.3% to 46.8% for infrared. For transmittance values, an increase was observed for all thicknesses according to greater wavelengths, and the largest variation occurred for the 0.2 mm thickness. All three wavelengths were able to pass through the dentin barrier at different thicknesses. Furthermore, the LED power loss and transmittance showed wide variations, depending on dentin thickness and wavelength.
通过不同牙本质厚度模拟不同深度的窝洞预备，评估三种波长的发光二极管（LED）的穿牙本质光衰减情况。
从拔除的健康人磨牙的冠部牙本质制备42个三种厚度（0.2、0.5和1毫米；n = 14）的牙本质圆盘。用三种波长（450±10纳米、630±10纳米和850±10纳米）的LED光照射圆盘以测定光衰减。还通过分光光度法测量透光率。
就最小（0.2毫米）和最大（1.0毫米）牙本质厚度而言，蓝光的光衰减百分比在49.3%至69.9%之间，红光在42.9%至58.5%之间，红外光在39.3%至46.8%之间。对于透光率值，随着波长增加，所有厚度均观察到增加，且0.2毫米厚度的变化最大。所有三种波长都能够穿过不同厚度的牙本质屏障。此外，LED功率损耗和透光率表现出很大差异，这取决于牙本质厚度和波长。
