In order to observe the influence of Pulsed Nd:YAG laser at its out-of-contact with dentin on tooth temperature, we have applied pulsed Nd:YAG laser to 2mm thick dentin sample at a point of contact and from a distance of lmm. 2mm, 3mm and 4mm with an energy of 0.3W, 0.5W, 0.8W, 1.0W, 1.5W and 2.0W. They were exposed to periods of 3 seconds, 6 seconds, 9 seconds, 12 seconds and 15 seconds respectively and measured temperature changes.
The results as follows;
1. When the time a(nd the intensity of power were constant, the-temperature changes on dentin of tooth depended on the distance. The temperature increased when the laser intensity increased but two other conditions were constant.
2. At the point of contact, the temperature has risen over 5´C regardless of intensity of the power or the time. However, there was 5°C fluctuation with 0.3W for 3 seconds treatment. =
3. The temperature change was less than 51C thermal change at the distance of lmm and 2mm respectively when lased for 3 seconds, 6 seconds, 12 seconds and 15 seconds with 0.3W. Similar results were observed at 3 and 6 seconds treatment with 0.5W and at 3 seconds treatment with 0.8 and LOW respectively
4. It showed less than 5C thermal change when lased for 3 seconds, 6 seconds, 9 seconds, 12 seconds and 15 seconds with 0.3W at the distance of 3mm and 4mm. The same results were seen in 3 seconds, 6 seconds and 9 seconds treatment with 0.5W and in 3 seconds with 0.8W and 1.0W respectively
As we have seen the above, the results has indicated that pulsed Nd:YAG lasing at its off contact on dentin of 2mm thickness will not cause irreversible changes if lasing intensity, lasing distance and lasing time are appropriate.
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