Physico-chemical changes of human enamel irradiated with ArF excimer laser

Authors

  • Osnat Feuerstein PhD, DMD,

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    1. Department of Prosthodontics, The Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel
    • Department of Prosthodontics, The Hebrew University-Hadassah School of Dental Medicine, P.O.B. 12272, Jerusalem 91120, Israel.
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  • Isaac Mayer PhD,

    1. Department of Inorganic and Analytical Chemistry, The Hebrew University, Jerusalem, Israel
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  • Dan Deutsch PhD

    1. Dental Research Laboratory, Institute of Dental Sciences, The Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel
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Abstract

Background and Objectives

Irradiation of tooth enamel by lasers can alter its structure and chemical composition. The purpose of this work was to determine the compositional changes and to elucidate the mechanisms of laser-enamel interaction using ArF excimer laser.

Study Design/Materials and Methods

Human enamel irradiated with ArF excimer laser (wavelength, 193 nm) at different fluences, was examined using X-ray diffraction, infrared (IR) spectroscopy and microprobe analysis.

Results

Ablation without significant compositional changes in irradiated enamel was evident when low fluences (∼200–380 mJ/cm2) were used. However, fluences between 640 and 2,300 mJ/cm2 resulted in an increased Ca/P ratio, decreased amount of carbonate and protein, and the formation of tricalcium phosphate and tetracalcium phosphate, suggesting the involvement of a photothermal mechanism.

Conclusions

The results show that ArF excimer laser can alter the chemical composition and morphology of the highly mineralized (96%) dental enamel, depending on the fluence used. Lasers Surg. Med. 37:245–251, 2005. © 2005 Wiley-Liss, Inc.

Ancillary