Author/Editor		Lukač, M; Hočevar, F; Cencič, S; Nemeš, K; Keller, U; Hibst, R; Šušterčič, D; Gašpirc, U; Skalerič, U; Funduk, N
Title		Effects of pulsed CO2 and Er:YAG lasers on enamel and dentin
Type		članek
Source		In: Lasers in orthopedic, dental, and veterinary medicine II, Los Angeles 1993: proceedings. Bellingham: SPIE,
Publication year		1993
Volume		str. 169-75
Language		eng
Abstract		Enamel and dentin samples were exposed extraorally to pulsed TEA CO2 lasers with pulse durations of 1 microsec and 0.1 microsec. The ablation rate is for energy densities above 5 J/cm2 independent of the CO2 laser enrgy. For 1 micros long CO2 pulses the ablation rate is 3 microm/pulse for drilling in enamel, and 8 microm/ pulse for drilling in dentin. Drilling with 0.1 micros CO2 laser results in lower ablation rates of approximately 1 microm/pulse in enamel, and 4 microm/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 micros long Er:YAG laser pulses achieve better ablation in the hihg energy density range because ablation is not diminished as rapidly by the plasma formation. The Er:YAG laser saturated ablation rates are approximately 60 microm/pulse for drilling in dentin and 40 microm/pulse for drilling in enamel.
Descriptors		LASER SURGERY TOOTH ABRASION DENTAL ENAMEL DENTIN