Effect of low intensity laser irradiation on surgically created bony defects in rats

J. Nissan*, D. Assif, M. D. Gross, A. Yaffe, I. Binderman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


Low intensity lasers have been used by clinicians to improve healing and reduce pain in humans. Lasing also results in new bone formation around hydroxyapatite implants and a significant increase in the total bone area. However, the exact mechanism of cell biostimulation by laser is still unclear. This study biochemically assessed the effects of low intensity laser (Gallium-Arsenide) using 4 and 22.4 mW cm-2 power density on the bone healing process after surgically creating bony cavities in rat mandibles. Rats (n = 24) were divided into two groups each treated with specific energy, 4 or 22.4 mW cm-2, for 3 min each day post-surgery. Surgical cavities were created on both sides of the mandible: the left served as an untreated control, the right was treated with laser. All rats were sacrificed after 1, 2 and 4 weeks of treatment. In the newly formed callus, accumulation of radiocalcium and alkaline phosphatase activity was measured to indicate osteogenic activity. One-way ANOVA with repeated measures showed that the low intensity laser using 4 mW cm-2 power density significantly increased radiocalcium accumulation from 2 weeks post-surgery, whereas 22.4 mW cm-2 had no effect. No changes were noted in the activity of alkaline phosphatase with the laser treatment. These results suggest that laser therapy of low power density is effective on the bone healing process in artificially created osseous cavities by affecting calcium transport during new bone formation.

Original languageEnglish
Pages (from-to)619-924
Number of pages306
JournalJournal of Oral Rehabilitation
Issue number8
StatePublished - Aug 2006


  • Alkaline phosphatase
  • Bone mineralization
  • Bony defects
  • Low intensity laser
  • New bone formation
  • Rat mandible


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