Department of Dentistry, School of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
Oper Dent. 2010 Nov-Dec;35(6):649-54. doi: 10.2341/10-066-L.
In the current study, the degree of conversion (DC) of bonding agents photoactivated using QTH or LED light-curing units (LCUs) was evaluated by Fourier Transform infrared spectroscopy with an attenuated total reflectance (ATR) device. Four LCUs were evaluated: one QTH (Optilux 501; Demetron Kerr) and three LEDs: Radii Cal (SDI), Elipar FreeLight 2 (3M ESPE) and Bluephase (Ivoclar Vivadent). Two etch-and-rinse (Scotchbond Multi-Purpose-SBMP and Single Bond 2-SB2) and two self-etch adhesives (Clearfil SE Bond-CSE, and Clearfil S3 Bond-CS3) were tested. For SBMP and CSE, the primer was not used. The irradiance and spectral emission of the LCUs were obtained with a radiometer and spectrometer. The materials were placed onto the ATR cell as thin films, the solvent was evaporated (when necessary) and photoactivation was carried out for 20 seconds. The DC (%) was evaluated after five minutes (n = 5). The data were statistically analyzed (p < 0.05). The irradiance for Optilux, Radii, FreeLight 2 and Bluephase was 760, 600, 1000 and 1100 mW.cm(-2), respectively. The wavelength of emission for Optilux was between 375 and 520 nm (peak at 496 nm), while for Radii, it was between 420 and 520 nm (peak at 467 nm). Freelight 2 presented an emission spectrum between 415 and 520 nm, and for Bluephase, it was between 410 and 530 nm, both having a peak at 454 nm. SB2 generally showed higher DC compared with the other bonding agents. When cured using the QTH unit, the DC results were SB2 = CS3 > CSE > SBMP; for all LEDs, the DC results showed SB2 > CSE > SBMP > CS3. For SB2, the highest DC was observed when the material was cured with Radii, while there were no significant differences among the other LCUs. CSE and CS3 showed higher DC when cured using the QTH unit, but similar results were observed among the LEDs. For SBMP, no significant differences among the LCUs were detected. In conclusion, the combination bonding agent vs curing unit had a significant effect on DC, mainly for the self-etch adhesives.
在目前的研究中，通过傅里叶变换红外光谱仪和衰减全反射（ATR）装置评估了 QTH 或 LED 光固化单元（LCU）光固化后的粘结剂的转化率（DC）。评估了四种 LCU：一种 QTH（Optilux 501；Demetron Kerr）和三种 LED：Radii Cal（SDI）、Elipar FreeLight 2（3M ESPE）和 Bluephase（Ivoclar Vivadent）。测试了两种酸蚀冲洗（Scotchbond Multi-Purpose-SBMP 和 Single Bond 2-SB2）和两种自酸蚀粘结剂（Clearfil SE Bond-CSE 和 Clearfil S3 Bond-CS3）。对于 SBMP 和 CSE，未使用底漆。使用辐射计和分光光度计获得 LCU 的辐照度和光谱发射。将材料制成薄膜放置在 ATR 池上，蒸发溶剂（如有必要），然后进行 20 秒的光固化。五分钟后评估 DC（%）（n = 5）。数据进行了统计学分析（p < 0.05）。Optilux、Radii、FreeLight 2 和 Bluephase 的辐照度分别为 760、600、1000 和 1100 mW.cm(-2)。Optilux 的发射波长在 375 到 520nm 之间（峰值在 496nm），而 Radii 的发射波长在 420 到 520nm 之间（峰值在 467nm）。FreeLight 2 的发射光谱在 415 到 520nm 之间，而 Bluephase 的发射光谱在 410 到 530nm 之间，两者的峰值均在 454nm。SB2 通常显示出比其他粘结剂更高的 DC。当使用 QTH 单元固化时，SB2 的 DC 结果为 SB2 = CS3 > CSE > SBMP；对于所有的 LED，SB2 的 DC 结果为 SB2 > CSE > SBMP > CS3。对于 SB2，当用 Radii 固化时观察到最高的 DC，而其他 LCU 之间没有显著差异。CSE 和 CS3 在用 QTH 单元固化时显示出较高的 DC，但在 LED 之间观察到相似的结果。对于 SBMP，在 LCU 之间没有检测到显著差异。综上所述，粘结剂与固化单元的组合对 DC 有显著影响，主要对自酸蚀粘结剂有影响。
