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Proceedings Paper

Effects of LED or laser phototherapy on bone defects grafted with MTA and irradiated with laser or LED light: a comparative Raman spectroscopic study
Author(s): Antonio L. B. Pinheiro; Luiz G. P. Soares; Artur Felipe S. Barbosa; Landulfo Silveira
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Paper Abstract

We studied peaks of calcium hydroxyapatite - CHA on defects grafted with MTA, treated or not with Light Emitting Diode - LED or IR Laser. 54 rats were divided in 6 groups each subdivided into 3 subgroups (15,21,30d). LED (λ850 ± 10nm) or IR Laser (λ850 nm) was applied over (LED) or in 4 points around the defect at 48 h intervals for 15 days. Raman readings were taken at the surface of the defect. The smaller overall intensity of the peak was found in Group MTA + Laser (1510.2 ± 274.1) and the highest on Group LED (2322 ± 715). There were no statistically significant differences between non-irradiated subjects on regards the CHA peaks. On the other hand, there were statistically significant differences between the Group Clot and LED, Clot and Laser, and Clot and MTA + Laser (p =0.01, p = 0.02, p = 0.003). There were no significant differences between Group MTA and MTA + LED (p=0.2) but significant differences were seen between Groups MTA and MTA + Laser (p=0.01). Significant differences were also observed between Groups LED and Laser (p <0.001) and between Groups MTA + LED and MTA + Laser (p=0.009). MTA, due to its characteristics, seemed to be directly affected by the light. However, the use of either phototherapy positively affected bone healing similarly as observed on different studies using other biomaterials. The overall analysis of our results indicated that the use of either light source resulted in a better, more advanced, and of quality bone repair.

Paper Details

Date Published: 9 March 2012
PDF: 7 pages
Proc. SPIE 8211, Mechanisms for Low-Light Therapy VII, 821108 (9 March 2012); doi: 10.1117/12.906003
Show Author Affiliations
Antonio L. B. Pinheiro, Univ. Federal da Bahia (Brazil)
Camilo Castelo Branco Univ. (Brazil)
Nacional Institute of Optics and Photonics (Brazil)
Luiz G. P. Soares, Univ. Federal da Bahia (Brazil)
Artur Felipe S. Barbosa, Univ. Federal da Bahia (Brazil)
Landulfo Silveira, Camilo Castelo Branco Univ. (Brazil)

Published in SPIE Proceedings Vol. 8211:
Mechanisms for Low-Light Therapy VII
Michael R. Hamblin; Juanita Anders; James D. Carroll, Editor(s)

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