Gao Yang, Zhao Zhuoping, Li Li, Zhang Kuanshou, Liu Qingmei
Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Taiyuan, China.
School and Hospital of Stomatology, Shanxi Medical University, Taiyuan, China.
Photodiagnosis Photodyn Ther. 2020 Sep;31:101900. doi: 10.1016/j.pdpdt.2020.101900. Epub 2020 Jun 24.
To compare two different laser sources, a KTP laser with a wavelength of 532 nm and a Nd:YAG laser with a wavelength of 1064 nm, to investigate the relation between laser source and bleaching gel during laser irradiation.
Extracted human teeth were stained and randomly divided into six groups. Two in-office bleaching gels, Beyond and Opalescence Boost, were applied to stained teeth and then irradiated at either 532 nm or 1064 nm. The temperature change of pulp chamber was measured. The color change (ΔE*) was evaluated at the following time points: immediately after bleaching, 7, 14 and 30 days after the end of bleaching.
Boost irradiated by KTP laser showed the higher temperature increase when compared with Beyond irradiated KTP and Nd:YAG. Boost irradiated by Nd:YAG presented lower temperature increase than by KTP. All groups showed a certain color change. After bleaching, Nd:YAG laser irradiation did not increase the ΔE* value significantly compared with gels without laser (p > 0.05). At each time point, Boost activated by KTP laser showed higher ΔE* value compared with other groups (p < 0.05), but decreased significantly 15 days after the end of bleaching. The other groups showed a relatively small change in ΔE* value after 30 days (p > 0.05).
KTP laser achieved better results than the Nd:YAG laser regarding tooth color change when associated with the Opalescence Boost bleaching gels.
比较两种不同的激光源，波长为532nm的KTP激光和波长为1064nm的Nd:YAG激光，以研究激光照射过程中激光源与漂白凝胶之间的关系。
将拔除的人牙染色并随机分为六组。将两种诊室漂白凝胶Beyond和Opalescence Boost应用于染色牙齿，然后分别用532nm或1064nm波长的激光照射。测量牙髓腔的温度变化。在以下时间点评估颜色变化（ΔE*）：漂白后立即、漂白结束后7天、14天和30天。
与Beyond照射的KTP激光和Nd:YAG激光相比，KTP激光照射的Boost温度升高更高。Nd:YAG激光照射的Boost温度升高低于KTP激光照射的。所有组均出现一定程度的颜色变化。漂白后，与未用激光照射的凝胶相比，Nd:YAG激光照射并未显著增加ΔE值（p＞0.05）。在每个时间点，KTP激光激活的Boost与其他组相比显示出更高的ΔE值（p＜0.05），但在漂白结束后15天显著下降。其他组在30天后ΔE*值变化相对较小（p＞0.05）。
当与Opalescence Boost漂白凝胶联合使用时，KTP激光在牙齿颜色变化方面比Nd:YAG激光取得了更好的效果。
