| 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 |