Visuri S R, Walsh J T, Wigdor H A
Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, USA.
Lasers Surg Med. 1996;18(3):294-300. doi: 10.1002/(SICI)1096-9101(1996)18:3<294::AID-LSM11>3.0.CO;2-6.
Several lasers have been explored for hard dental tissue applications; used alone they have resulted in potentially harmful temperature increases in the pulp chamber.
An Er:YAG laser (lambda = 2.94 microns) was used to ablate hard dental tissues. Ablation rates with and without a water-cooling spray were measured. Subsequent experiments investigated the cooling effects of the water. Initially single channels were drilled into dentin; further studies involved ablating rectangular areas with repetition rates up to 10 Hz.
The water spray minimally reduced the ablation rates of dentin and did not affect the ablation rates of enamel. The water spray effectively cooled the teeth; while using the maximum average power investigated (10 Hz, 360 mJ/pulse), a water flow rate of 4.5 ml/min limited the temperature rise in the pulp chamber to less than 3 degrees C.
The studies confirm the feasibility of using an Er:YAG laser in conjunction with a water spray to safely and effectively remove hard dental tissues.
人们已对多种激光用于硬牙组织的情况进行了探索；单独使用时，它们会导致牙髓腔内温度出现潜在有害的升高。
使用掺铒钇铝石榴石激光（波长 = 2.94微米）对硬牙组织进行消融。测量了有无水冷喷雾时的消融速率。后续实验研究了水的冷却效果。最初在牙本质上钻出单通道；进一步的研究包括以高达10赫兹的重复频率对矩形区域进行消融。
水冷喷雾对牙本质的消融速率降低极小，且不影响釉质的消融速率。水冷喷雾有效地冷却了牙齿；在使用所研究的最大平均功率（10赫兹，360毫焦/脉冲）时，4.5毫升/分钟的水流速率将牙髓腔内的温度升高限制在3摄氏度以下。
这些研究证实了使用掺铒钇铝石榴石激光结合水冷喷雾安全有效地去除硬牙组织的可行性。
