Effects of pulsed CO2 and Er:YAG lasers on enamel and dentin

Matjaz Lukac; Franci Hocevar; Simona Cencic; Karolj N. Nemes; Ulrich Keller D.D.S.; Raimund Hibst; Dusan Sustercic; Boris Gaspirc; Uros Skaleric; Nenad Funduk

doi:10.1117/12.148320

21 July 1993 Effects of pulsed CO₂ and Er:YAG lasers on enamel and dentin

Matjaz Lukac, Franci Hocevar, Simona Cencic, Karolj N. Nemes, Ulrich Keller D.D.S., Raimund Hibst, Dusan Sustercic, Boris Gaspirc, Uros Skaleric, Nenad Funduk

Author Affiliations +

Proceedings Volume 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II; (1993) https://doi.org/10.1117/12.148320
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Enamel and dentin samples were exposed extraorally to pulsed TEA CO₂ lasers with pulse durations of 1 microsecond(s) ec and 0.1 microsecond(s) ec. The ablation rate is for energy densities above 5 J/cm² independent of the CO₂ laser energy. For 1 microsecond(s) long CO₂ pulses the ablation rate is 3 micrometers /pulse for drilling in enamel, and 8 micrometers /pulse for drilling in dentin. Drilling with 0.1 microsecond(s) CO₂ laser results in lower ablation rates of approximately 1 micrometers /pulse in enamel, and 4 micrometers /pulse in dentin. At all experimental energy densities plasma formation is observed, effectively reducing the amount of energy deposition. Compared with these results, experiments with the Er:YAG laser show that 200 microsecond(s) long Er:YAG laser pulses achieve better ablation in the high energy density range because ablation is not diminished as rapidly by the plasma formation. The Er:YAG laser saturated ablation rates are approximately 60 micrometers /pulse for drilling in dentin and 40 micrometers /pulse for drilling in enamel.

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Matjaz Lukac, Franci Hocevar, Simona Cencic, Karolj N. Nemes, Ulrich Keller D.D.S., Raimund Hibst, Dusan Sustercic, Boris Gaspirc, Uros Skaleric, and Nenad Funduk "Effects of pulsed CO₂ and Er:YAG lasers on enamel and dentin", Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); https://doi.org/10.1117/12.148320

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