Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Diode Laser Irradiation Effects on the Sealing Ability of Root Canal Sealers

Full text
Author(s):
Ribeiro, A. C. [1, 2] ; Nogueira, G. E. C. [3, 1] ; Mayer, M. P. A. [1] ; Antoniazzi, J. H. [2] ; Zezell, D. M. [1]
Total Authors: 5
Affiliation:
[1] IPEN CNEN SP, Nucl & Energy Res Inst, Ctr Lasers & Applicat, BR-05508900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Dent, Endodont Dept, BR-05508900 Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Biomed Sci, Dept Microbiol, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Laser Physics; v. 20, n. 6, p. 1486-1490, JUN 2010.
Web of Science Citations: 0
Abstract

This study aimed to test the hypothesis that dentine alterations induced by 810 nm-diode laser may affect the interaction between root canal sealers and the dentin wall. Seventy-two single root human teeth were selected and root canals were enlarged with K-files. Dentine was treated with 0.5% NaOCl and 17% EDTA-T and irradiated (laser group) by diode laser (810 nm/P = 2.5W/I = 1989 W/cm(2)) or remained non-irradiated (control group). Six samples per group were analyzed by scanning electron microscopy (SEM). The remaining samples of each group were divided into three subgroups (n = 10) and sealed with one of the tested sealers (N-Rickert/AHPlus (TM)/Apexit (R)). Apical leakage was estimated by evaluating penetration of 0.5% methylene-blue dye. SEM analysis revealed that dentine at the apical third in irradiated samples was melted and fusioned whereas non-irradiated samples exhibited opened dentinal tubules. Despite the morphological changes induced by irradiation, laser did not affect the sealing ability of N-Rickert and AHPlus (TM) sealers. However, the length of apical leakage in roots filled with Apexit (R) was lower in irradiated root canals than in non-irradiated samples (p < 0.05). Morphological changes of root canal walls promoted by diode laser irradiation may improve de sealing ability of Apexit (R), a calcium hydroxide-based sealer, suggesting that improved sealing promoted by irradiation may represent an additional factor contributing to the endodontic clinical outcome. (AU)

FAPESP's process: 05/51689-2 - Optics and Photonics Research Center at UNICAMP
Grantee:Hugo Luis Fragnito
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC