Bovine dentin ablation using an MIR-FEL at the wavelength of 6.05 &#956;m

Manabu Heya; Kazushi Yoshikawa; Junji Kato D.D.S.

doi:10.1117/12.762547

22 February 2008 Bovine dentin ablation using an MIR-FEL at the wavelength of 6.05 μm

Manabu Heya, Kazushi Yoshikawa, Junji Kato D.D.S.

Proceedings Volume 6843, Lasers in Dentistry XIV; 684302 (2008) https://doi.org/10.1117/12.762547
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Background and Objective: 6.05-μm-laser is strongly absorbed by means of both the OH bending of water and the amide-I of proteins. In order to prove the usefulness of dentin ablation by laser irradiation with λ = 6.05 μm, we investigated an ablative behavior of bovine dentin without a water spray. Study Design/Materials and Methods: The dehydrated bovine dentin was irradiated without a water spray by the mid-infrared Free Electron Laser at λ = 6.05 μm and λ = 9.7 μm, while varying the laser parameters, such as the incident fluence and the number of pulse. We observed the configurational changes in the irradiated dentin surface using a scanning electron microscope and estimated the removed volume using a laser confocal microscope. Also, we measured the temperature rise using a radiation thermometer and the emission spectrum using a fiber optics spectrometer during laser irradiation. Results: We found the followings: (1) the dentin was ablated by the evaporation of proteins at the maximum temperature rise of ~400 degC; (2) the irradiated dentin surface had dentinal tubules and was not melted; (3) the extent of the ablative behavior was proportional to the laser parameters used; (4) the tensile bonding strength between the irradiated dentin surface and the composite resin was significantly higher than that for Er:YAG laser irradiation. Conclusion: We can conclude that 6.05-μm-laser can thermo-mechanically excise dentin by the evaporation of proteins even without a water spray. We showed the applicability of a 6.05-μm-laser to a non-invasive laser treatment.

Citation Download Citation

Manabu Heya, Kazushi Yoshikawa, and Junji Kato D.D.S. "Bovine dentin ablation using an MIR-FEL at the wavelength of 6.05 μm", Proc. SPIE 6843, Lasers in Dentistry XIV, 684302 (22 February 2008); https://doi.org/10.1117/12.762547

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