Petersen Marlene, Braun Andreas, Franzen Rene
Department of Operative Dentistry, Periodontology and Preventive Dentistry, RWTH Aachen University, 52074 Aachen, Germany.
J Clin Med. 2024 Apr 16;13(8):2301. doi: 10.3390/jcm13082301.
In the current cosmetics industry, bleaching is often associated with lasers. However, such treatment also harbors risks. Tooth death is observed at pulpal temperature increases ≥5.6 °C. Therefore, it seems important to investigate the effects of using different lasers. The aim of this study was to determine pulpal temperature increases at different laser parameters during bleaching by modeling a realistic environment and to compare the temperature recording using a thermocouple and thermal camera. The authors assumed that there are laser settings for the lasers used at which the pulpal temperature increases are <5.6 °C and that the temperature recordings with thermocouples and thermal cameras differ only minimally. Human teeth were used, which were extracted for dental reasons. During experiment, teeth were bleached conventionally and by laser activation at 940 nm, 445 nm, and 970 nm. The temperature in the pulp was recorded using thermocouples. In a second setup, longitudinally halved teeth were bleached, while the temperature in the pulp was recorded with a thermocouple and thermal camera. Descriptive statistics were used. The significance level is 0.05. In addition to conventional bleaching, temperature increases <5.6 °C were observed for bleaching at 940 nm 1.5 W, at 445 nm 0.3 W, and at 970 nm 0.5 W. For bleaching procedures using 940 nm 7 W, 940 nm 2 W, 445 nm 0.5 W, and 970 nm 1 W, the temperature increase was ≥5.6 °C. Significant differences ( < 0.05) were found in the maximum temperature increases (°C) between all groups. Temperature recordings using a thermocouple and thermal camera differed by about 2.3 °C. The working hypotheses were confirmed. With laser bleaching, attention must be paid to the type of laser, its power, and the time in order to avoid excessive overheating of the dental pulp.
在当前的化妆品行业中，牙齿美白通常与激光联系在一起。然而，这种治疗也存在风险。当牙髓温度升高≥5.6°C时，会观察到牙齿坏死。因此，研究使用不同激光的效果似乎很重要。本研究的目的是通过模拟真实环境来确定漂白过程中不同激光参数下牙髓温度的升高情况，并比较使用热电偶和热成像仪进行温度记录的结果。作者假设，对于所使用的激光存在一些设置，在这些设置下牙髓温度升高<5.6°C，并且热电偶和热成像仪的温度记录差异极小。使用的是因牙科原因拔除的人类牙齿。在实验过程中，牙齿通过传统方法以及在940nm、445nm和970nm波长下的激光激活进行漂白。使用热电偶记录牙髓温度。在第二种设置中，将纵向对半切开的牙齿进行漂白，同时用热电偶和热成像仪记录牙髓温度。使用了描述性统计方法。显著性水平为0.05。除了传统漂白外，在940nm 1.5W、445nm 0.3W和970nm 0.5W的激光漂白下观察到温度升高<5.6°C。对于使用940nm 7W、940nm 2W、445nm 0.5W和970nm 1W的漂白程序，温度升高≥5.6°C。在所有组之间的最高温度升高（°C）中发现了显著差异（<0.05）。使用热电偶和热成像仪进行的温度记录相差约2.3°C。工作假设得到了证实。在进行激光漂白时，必须注意激光的类型、功率和时间，以避免牙髓过度过热。
