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Proceedings Paper

Enlargement of the apical gap after laser root resection
Author(s): Guilherme Paulo S. Mello; Thais Cachute Paradella; Egberto Munin; Jose Benedicto Mello; Marcos T. T. Pacheco
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Paper Abstract

An apical filling material should establish, as perfect as possible, the hermetic sealing of an apical cavity. However, a gap is formed between the filling material (gutta-percha) and the root canal wall. The egress of irritants into the root canal system to the periapical tissues is considered the principal cause of fails in apicoectomy and retro-filling, being assumed that irritants penetrate mainly through the gap located between the gutta-percha and the dentin. In this paper, we report the observation of an enlargement of the apical gap, after laser apicoectomy, comparing to conventional apicoectomy. The samples were divided into groups, and the conventional apicoectomy group, together with the Er:YAG laser group (400 mJ/10 Hz) produced both similar results, being the gap unaltered. On the other hand, the samples that were irradiated with the Er:YAG laser, followed by Nd:YAG laser irradiation (1.5 W/10 Hz) presented a larger gap, conclusions that were drawn from Scanning Electronic Microscope analysis. The enlargement of the gap was due to the fusion of the dentin on the border, close to the gutta-percha. This pronounced behavior might have been caused by the surface discontinuity, imposing a non-homogeneous condition, in relation to heat propagation, existing many clinical applications of these observations.

Paper Details

Date Published: 16 November 2000
PDF: 7 pages
Proc. SPIE 4161, Optical Biopsy and Tissue Optics, (16 November 2000); doi: 10.1117/12.409317
Show Author Affiliations
Guilherme Paulo S. Mello, Univ. do Vale do Paraiba (Brazil)
Thais Cachute Paradella, Univ. do Vale do Paraiba (Brazil)
Egberto Munin, Univ. do Vale do Paraiba (Brazil)
Jose Benedicto Mello, Univ. do Vale do Paraiba (Brazil)
Marcos T. T. Pacheco, Univ. do Vale do Paraiba (Brazil)

Published in SPIE Proceedings Vol. 4161:
Optical Biopsy and Tissue Optics
Irving J. Bigio; Gerhard J. Mueller; Gerwin J. Puppels; Rudolf W. Steiner; Katarina Svanberg M.D., Editor(s)

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