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Quintessence Publishing: Journals: JOLA

 

The Journal of Oral Laser Applications

Edited by Prof Dr Andreas Moritz and Prof G. Lynn Powell

Official publication of the European Society for Oral Laser Applications

ISSN (print) 1473-7809 • ISSN (online) 1867-5611

Publication:
JOLA
Winter 2005
Volume 5 , Issue 4

Pages: 237-243
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Influence of Er:YAG Laser Beam Angle, Working Distance, and Energy Density on Dentin Morphology: An SEM Investigation

de Carvalho, Rubens C. R./de Freitas, Patricia M./Otsuki, Masayuki/de P. Eduardo, Carlos/Tagami, Junji

Purpose: To evaluate the morphological aspects of dentin surfaces irradiated with different parameters (energy, contact or noncontact, incidence angle) of the Er:YAG laser and determine whether dentin morphology is adversely affected by these parameters. Materials and Methods: Forty-five dentin disks were obtained from extracted third molars. An area of 6 x 9 mm2 was delimited on the dentin surface of each specimen. After that, specimens were randomly divided into 9 groups: G1 control; G2 Er:YAG laser at 150 mJ, 90-degree angle, contact mode (38.8 J/cm2); G3 Er:YAG laser at 70 mJ, 90-degree angle, contact (18.1 J/cm2); G4 Er:YAG laser at 150 mJ, 90-degree angle, noncontact mode (1.44 J/cm2); G5 Er:YAG laser at 70 mJ, 90-degree angle, noncontact mode (0.67 J/cm2); G6 Er:YAG laser at 150 mJ, 45-degree angle, contact mode (37.5 J/cm2); G7- Er:YAG laser at 70 mJ, 45-degree angle, contact mode (17.5 J/cm2); G8 - Er:YAG laser at 150 mJ, 45-degree angle, noncontact (1.55 J/cm2); G9 - Er:YAG laser at 70 mJ, 45-degree angle, noncontact mode (0.72 J/cm2). After irradiation, dentin surfaces were analyzed under scanning electron microscopy (SEM). Results: SEM analysis revealed different surface morphology within the groups evaluated. The contact mode of irradiation and higher energy densities (G2 and G6) produced greater changes on dentin surfaces. Conclusions: Different energy densities and contact/noncontact mode irradiation cause different morphological changes on dentin surfaces. Operators should be aware of the best irradiation settings for a specific clinical application.

Keywords: dentin, energy, Er:YAG laser, incidence angle, morphology

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