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Erbium laser ablation of dental hard tissue: Effect of water cooling

✍ Scribed by Visuri, Steven R.; Walsh, Joseph T.; Wigdor, Harvey A.

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 712 KB
Volume: 18
Category: Article
ISSN: 0196-8092
DOI: 10.1002/(sici)1096-9101(1996)18:3<294::aid-lsm11>3.0.co;2-6

No coin nor oath required. For personal study only.

✦ Synopsis

Background and Objective: Several lasers have been explored for hard dental tissue applications; used alone they have resulted in potentially harmful temperature increases in the pulp chamber. Materials and Methods: An Er:YAG laser (A = 2.94 pm) 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. Results: 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 mumin limited the temperature rise in the pulp chamber to less than 3°C.

Conclusion:

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.

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