The purpose of this study was to evaluate the analgesic effect on pulp induced by pulsed
Nd:YAG laser according to the power density, irradiated time and the method of apllication(Non-contact vs contact) in vivo.
Experiments were carried out in 90 volunteers who have sound 4 canines. Each canine was grouped by the intensity and the time of irradiation of pulsed Nd:YAG laser was measured. Mean EPT response(units) was measured on 5 min, 30 min, and 60 miuntes after irradiation with various intensity(1.5-3W, 15-30Hz), irradiated time(1.5min, 3min), and application method (Non-contact and contact).
The results were as follows :
1. 5 minutes after irradiation, the mean EPT response(units) was increased by 32.9 in the non-contact method and by 35% in the contact method of application. Which showed significant difference in mean EPT response(units) compared with not-lased canine in each groups(P< 0.05).
2. The mean EPT response(units) with irradiating condition according to the various laser intensity, and irradiation time was not stastically significant different in each groups by time elapsed.
3. There was no significant difference between non-contact and contact method in the mean El´T response(units).
4. The mean EPT response(units) has returned to baseline values within 30 miuntes.
In regard to the above results, analgesic effect on pulp induced by pulsed Nd:YAG laser resulted in slight increasing of pulpal pain threshold, but it was not so high as to replace the role of drug analgesia wholly. This technique can be used for inducing pulpal analgesia as adjunct to other pain control methods and needed to develop to have better analgesic effect.
|