Yuan Fusong, Zheng Jianqiao, Sun Yuchun, Wang Yong, Lyu Peijun
1 Center of Digital Dentistry, Peking University School and Hospital of Stomatology , Beijing, China .
2 National Engineering Laboratory, Digital and Material Technology of Stomatology , Beijing, China .
Photomed Laser Surg. 2017 Jun;35(6):332-337. doi: 10.1089/pho.2016.4242.
The aim of this study was to assess and regulate heat generation in the dental pulp cavity and circumambient temperature around a tooth during laser ablation with a femtosecond laser in a confined space.
The automatic tooth preparing technique is one of the traditional oral clinical technology innovations. In this technique, a robot controlled an ultrashort pulse laser to automatically complete the three-dimensional teeth preparing in a confined space. The temperature control is the main measure for protecting the tooth nerve.
Ten tooth specimens were irradiated with a femtosecond laser controlled by a robot in a confined space to generate 10 teeth preparation. During the process, four thermocouple sensors were used to record the pulp cavity and circumambient environment temperatures with or without air cooling. A statistical analysis of the temperatures was performed between the conditions with and without air cooling (p < 0.05).
The recordings showed that the temperature with air cooling was lower than that without air cooling and that the heat generated in the pulp cavity was lower than the threshold for dental pulp damage.
These results indicate that femtosecond laser ablation with air cooling might be an appropriate method for automatic tooth preparing.
本研究旨在评估和调节在密闭空间中使用飞秒激光进行激光消融时牙髓腔内的产热以及牙齿周围的环境温度。
自动牙齿制备技术是传统口腔临床技术创新之一。在该技术中，机器人控制超短脉冲激光在密闭空间内自动完成三维牙齿制备。温度控制是保护牙神经的主要措施。
在密闭空间中，使用机器人控制的飞秒激光对10颗牙齿标本进行照射，以完成10次牙齿制备。在此过程中，使用四个热电偶传感器记录有无空气冷却时牙髓腔和周围环境的温度。对有空气冷却和无空气冷却条件下的温度进行统计学分析（p < 0.05）。
记录显示，有空气冷却时的温度低于无空气冷却时的温度，且牙髓腔内产生的热量低于牙髓损伤阈值。
这些结果表明，有空气冷却的飞秒激光消融可能是一种合适的自动牙齿制备方法。
