Morita AdvErL EVO, Инструкция по эксплуатации, Страница: 57 / 76

Instructions for Use 2012-08-23 55
(6) Clinical Procedure
6.1) General
Begin treatment with the lowest energy possible. If more tissue reaction is desired, increase the energy level in
small increments until the desired tissue effect is observed.
Stop frequently to observe the treated area and adjust the laser settings accordingly.
Patients will usually respond more favorably if lower settings are used in the beginning of the treatment.
The ablation effect of the laser energy remove the target tissue structure is not any mechanical action of the tip.
6.2) Tissue Effects of Er:YAG Laser
Er:YAG laser beam is well absorbed by water.
The rate of tissue removal strong1y depends on the water content of the target tissue.
So the percentage of water in target tissue is very important.
Enamel has a few percentage of water, caries and healthy dentin is more than enamel, so that caries and dentin
will be removed much faster than healthy enamel. Soft tissue contains water with much more percentages, and
can be ablated very rapidly.
6.3) Pulse Energy (Energy Level Setting: mJ)
Pulse energy is very important because higher pulse energy is effective for tissue ablation.
The energy of pulse is varied from 30 mJ.
Under 10 Hz, the maximum energy is 400 mJ.
At 20 Hz, the maximum energy is 170mJ.
At 25 Hz, the maximum energy is 80mJ.
In case of using high energy per pulse settings, consider about patient discomfort and adverse effects on tissues. .
The duration of each individual pulse is a duration of approximately 300 microseconds.
This duration is very short compared to a whole second.
The time between irradiation, tissue is cooled properly with spray water.
6.4) PPS (Hz)
This is irradiation number of times in a second. The PPS setting can be adjusted from 1 to 25 Hz.
It can influence patients' comfort level.
Generally, higher PPS irradiation of tissue surface will be smooth in enamel and dentin.
In soft tissue, the finish line of the cut can be better controlled.
Lower PPS setting is better to improving patient’s comfort level.
6.5) Laser Energy Density
The threshold for ablation depends not only on the energy per pulse, but also depends on the density of the energy
per pulse.
When the laser energy is irradiated on tissues, a higher energy density will have a greater effect.
The laser emission from the tip end spreads out, as detailed at 6.6) Type of Tips .
Therefore, the best cutting efficiency is achieved when the tip is very close to the target.
In order to get the best cutting efficiency and longest tip lifetimes, be separately used from the hard tissue
approximately 1/2mm.
Another, diameter of tip is important. Treatment by small diameter tips will be more effective on ablation than
lager diameter tip, but irradiated area is smaller