Effect of water content on UV and IR hard tissue ablation

Joseph Neev; Brian Jet-Fei Wong M.D.; Jon P. Lee; Vivian Sung; Michael W. Berns

doi:10.1117/12.199246

18 January 1995 Effect of water content on UV and IR hard tissue ablation

Joseph Neev, Brian Jet-Fei Wong M.D., Jon P. Lee, Vivian Sung, Michael W. Berns

Proceedings Volume 2323, Laser Interaction with Hard and Soft Tissue II; (1995) https://doi.org/10.1117/12.199246
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

The effect of water content on ablation rates in hard tissue is considered. Two wavelength regimes and two types of tissue (dentin and bone) are compared. In the UV (XeCl excimer at 308 nm) the ablation rate is lower in dehydrated dentin than in fresh dentin. In dehydrated dentin the ablation rates at 2.5 J/cm² and 7.0 J/cm² are 0.6 and 0.8 micrometers /pulse, respectively. In fresh dentin the rates are nearly three times as large. A logarithmic increase is indicated. Dentin ablation with the IR (Ho:YAG, 2.1 micrometers ) showed a similar trend to that of dentin XeCl ablation: fresh samples ablated faster then dehydrated samples. Ablation rates are considerably higher in this case and range, from 1.7 micrometers /p at 20 mJ/p to 21.5 micrometers /p near 230 mJ/p in dehydrated dentin. In fresh samples for the same energy range the ablation rates were 5.1 to 213 micrometers /pulse. This effect was reversed in cortical bone. Here ablation rates of dehydrated bone were higher than those of fresh bone. In fresh bone, ablation rates ranged from 1 micrometers /p at 50 mJ to 48 micrometers /p near 300 mJ/p and in dehydrated bone from 7 micrometers /p at 30 mJ to 68 micrometers /p near 280 mJ/p. Possible explanation of these observations are discussed.

Citation Download Citation

Joseph Neev, Brian Jet-Fei Wong M.D., Jon P. Lee, Vivian Sung, and Michael W. Berns "Effect of water content on UV and IR hard tissue ablation", Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); https://doi.org/10.1117/12.199246

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