Morita AdvErL EVO, Инструкция по эксплуатации, Страница: 55 / 76

Instructions for Use 2019-07-22 53
7. Clinical Applications
(1) Introduction
The AdvErL EVO Laser System is intended for use only by dentists trained in the safe handling of the laser.
Please read and understand this user manual, and use the laser system in vitro prior to using it on patients.
Observe all of the safety precautions described in this user manual.
Hygienists or other health professionals handling lasers should also read and understand this user manual of the
system.
(2) Er:YAG Laser Ablation
2.1) Tissue Interaction
AdvErL EVO is an Er:YAG laser system.
Er:YAG is Erbium doped Yttrium Aluminum Garnet crystal, and system generate 2.94um laser.
It was selected because of the wavelength matching with vibrational absorption of water molecules in the
tissue.
Figure l shows that absorption coefficient of water.
Er:YAG laser wavelength (2.94um) is near the peak of absorption coefficient of water.
When laser are absorbed by tissues, it excite the movement of tissue molecules and causes tissue
coagulation and vaporization, in both hard and soft oral tissues.
Figure l Absorption coefficient of water.
[Data from D. J. Segelstein, “The complex refractive index of water”,
University of Missouri-Kansas City, (1981)]
2.2) Parameter of Laser Ablation
There are many important parameters for laser ablation procedures.
Parameter of laser output, such as pulse frequency, energy density, total irradiation time, etc., parameters of
laser tip, such as diameter and distance from the tissues, are all important for the laser ablation procedure.
For more detail, see later section.
■Reference
l) Tissue Ablation: Devices and Procedures John. G XVebster
2) Dent. Clin. N. Am. 48 (2004)1017-1059 Glenn van As
3) Laser-Tissue Interactions: Fundamentals and Applications Markolf H. Niemz
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Er:YAG 2.94um
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