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Journal of Oral Laser Applications

Year 2001
Volume 1 , Issue 2

Pages: 103 - 106

In Vitro Study of Hydroxyapatite and Enamel Powder Fused to Human Enamel by Nd:YAG Laser

Marcus Vinicius Lucas Ferreira/Denise Maria Zezell

Purpose: To evaluate the effects of pulsed Nd:YAG laser irradiation (1064 nm) on hydroxyapatite and enamel powder fusion. Materials and Methods: Because this laser beam is not well absorbed by these two compounds, they were mixed with vegetal coal in order to increase the absorption of the laser beam. Fifteen flat enamel surfaces were covered with three different substances: 1) hydroxyapatite mixed with vegetal coal (3:1 by weight); 2) enamel powder mixed with vegetal coal (3:1 by weight); 3) vegetal coal. Flat surfaces were used to determine the fusion of hydroxyapatite and enamel powder. All samples were irradiated with Nd:YAG laser with the following parameters: 80 mJ, 15 Hz, 1.2 W, 100 Ás pulse width, 131.1 J/cm2. The laser beam was delivered to the samples by using a 300-Ám diameter fiber optic, in contact. Morphology of the irradiated surfaces was examined by SEM. Results: Compounds with hydroxyapatite and enamel powder were fused to enamel surfaces. Conclusion: The fusion of synthetic hydroxyapatite and enamel powder by Nd:YAG laser on enamel surfaces could create a new possibility for sealing pits and fissures and also for restoring small cavities.


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