Abstract:
This research was study the effect of diode laser in
hardness of the material used in the combinations of teeth
(ceramics) by using the hardness tester (TH 160) to test
the hardness .
2
Hardness was measured for samples divided into six
groups, each group containing ten test sample, before and
after it irradiated with
the diode laser with wavelength
675 nm and power 30 mW, for a period of time two
minutes for the first group, and ten minutes for the
second. Also used a diode laser with wavelength 810 nm
and various power 30, 200, 500 mW, with irradiation
power of 200 mW for duration two minutes and ten
minutes to the third and fourth groups, and irradiation
power of 30 and 500 mW for duration one minute for the
last two groups.
The results showed that a significant increase in the
hardness of ceramic material for irradiated samples
compared to non-irradiated samples, where found that the
highest percentage of hardness was (41.6%) obtained
upon irradiation with a laser
wavelength 675 nm, and
power of 30 mW for duration two minutes.
The results also showed that the increase in the irradiated
time of the samples from two minutes to ten minutes, as
well as increased power from 30 to 500 mW does not have
a significant effect in increasing the hardness of the
ceramic material.
Also we found that irradiation of samples at power 30 mW
of visible laser with wavelength of 675 nm, hardness ratio
was higher (41.6%) compared with the hardness ratio
(18.28%) at the same irradiation power but invisible laser
.at wavelength 810 nm
