The effects of Nd:YAG laser on dental pulp of rhesus monkeys / 实用口腔医学杂志

ABSTRACT

Objective: To observe the effects of NdYAG laser on dental pulp of rhesus monkeys and compare the effects between methylene blue and silver nitrate on laser irradiation. Methods: 27 teeth of 3 monkeys were irradiated respectively by 1 592 mJ/mm 2 ,3 185 mJ/mm 2 or 4 777 mJ/mm 2 NdYAG laser. Befor irridiation 9 teeth were treated with methylene blue on the surfaces and 9 treated with silver nitrate.The other 3 teeth were used as controll.One hour after irradiation,pulp samples were obtained and observed with histological examination. Results: No harmful response was observed in the dental pulp following laser irradiation at 1 592 mJ/mm 3 no matter what teatment of occlusional surfaces. Mild change were observed in the pulp irradiated with the laser at 3 185 mJ/mm 2. Severe damages were found in the 4 777 mJ/mm 2 laser treated group.Methylene blue could enhance pulp damage but silver nitrate could minish the damage by isolating tooth surface from laser beam. Conclusion: Great output energy of NdYAG laser may cause damaging effects on dental pulp and the use of absorption dye onto the surface of teeth may enhance the effect of laser irradiation.