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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

Spring 2004
Volume 4 , Issue 1

Pages: 237-276
Share Abstract:

Cavosurface Angle Patterns of Er:YAG Laser Cavity Preparations in Primary Teeth

Giusti, Juçaíra S.M./Santos-Pinto, Lourdes/Lizarelli, Rosane F.Z./Bagnato, Vanderlei S.

Purpose: This study assessed cavities prepared in the enamel of primary teeth using Er:YAG laser. The rounding of the cavosurface margins and the angles of concavity at the base of the cuts were evaluated. Materials and Methods: Twelve exfoliated primary teeth were irradiated with Er:YAG laser emitting a wave length of 2.94 µm with a spot size of 0.70 mm. Radiation was perpendicularly applied for 10 s at a focal distance of 13 mm, with a pulse repetition rate of 10 Hz. The energy was set at either 200 mJ or 300 mJ. Cross-sectional views of the cut surfaces were examined in SEM micrographs (50X). All measurements of cavosurface angles and the angle of concavity were made using a modified cephalometric program. Results: The t-test analysis indicated differences in the occlusal and cervical cavosurface angles when the energy was modified: increased energy produced a cavity angle reduction. The occlusal vs cervical angle analysis showed no significant difference in cavities prepared with either energy level. Conclusion: Within the parameters of the present study, we concluded that there was a reduction in the concavity angle of the cavities when the laser energy was increased. The occlusal and cervical cavosurface angles were significantly different when the energy was increased.

Keywords: lasers, dental cavity preparation, primary teeth, Er:YAG laser irradiation, scanning electron microscopy, enamel

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