Department of Pediatric Dentistry, School of Stomatology, Peking University, Beijing, China.
Lasers Med Sci. 2012 Jan;27(1):141-4. doi: 10.1007/s10103-010-0854-1. Epub 2010 Nov 11.
Using scanning electron microscopy (SEM) we evaluated the morphology of cavity surfaces in deciduous teeth prepared in vitro with the Er:YAG laser with different power parameters. Eight extracted cavity-free deciduous teeth with an intact crown were prepared using a traditional handpiece or an Er:YAG laser with different parameters (10 Hz/200 mJ, 10 Hz/300 mJ and 10 Hz/400 mJ). Samples were then processed and cavity surface morphology was evaluated by SEM to detect open dentinal tubules, or melting or cracking of the dentin. SEM showed that laser cavity preparation in deciduous teeth using different parameters left no smear layer and the dentinal tubules were clear. Dentin melting was not seen after cavity preparation at 200 mJ or 300 mJ, while visible dentin melting and cracks were detected at 400 mJ. The use of the laser at 10 Hz/200 mJ and 10 Hz/300 mJ for cavity preparation in deciduous teeth is safe and effective, but higher powers may damage the dentin.
使用扫描电子显微镜（SEM），我们评估了用不同功率参数的 Er:YAG 激光在体外制备的乳牙窝洞表面的形态。使用传统手机或不同参数的 Er:YAG 激光（10 Hz/200 mJ、10 Hz/300 mJ 和 10 Hz/400 mJ）对 8 颗无龋的完整乳牙进行窝洞制备。然后对样本进行处理，用 SEM 评估窝洞表面形态，以检测开放的牙本质小管、牙本质的熔融或裂纹。SEM 显示，使用不同参数的激光在乳牙上制备窝洞后，不会留下玷污层，牙本质小管清晰可见。在 200 mJ 或 300 mJ 时进行窝洞制备后，未见牙本质熔融，而在 400 mJ 时则可见明显的牙本质熔融和裂纹。在乳牙上使用 10 Hz/200 mJ 和 10 Hz/300 mJ 的激光进行窝洞制备是安全有效的，但更高的功率可能会损坏牙本质。
