The effect of low-level laser therapy (810 nm) on root development of immature permanent teeth in dogs
Reza Fekrazad,Bahman Seraj,Sara Ghadimi,*Parvin Tamiz,Pouriya Mottahary,Mohammad-Mehdi Dehghan *Laser Research Center of Dentistry,Department of Pediatric Dentistry,School of Dentistry,Tehran University of Medical Sciences,Tehran,Iran
Abstract Traumatic injuries and dental caries can be a big challenge to
immature teeth. In these cases, the main purpose of treatment is to maintain
the pulp vitality. The purpose of this study was to investigate the effect of
low-level laser therapy on accelerating the rate of dentinogenesis in pulpotomy
of immature permanent teeth (apexogenesis). Three dogs, 4–6 months old, were
used in this study. One jaw in each dog was randomly assigned to laser
irradiation group. All selected teeth were pulpotomized with mineral trioxide
aggregate (MTA) and restored with amalgam. In the laser group, the Ga-Al-As
laser (810 nm, 0.3 W, 4 J/cm2, 9 s) was used on buccal and lingual gingiva of
each tooth in 48 h intervals for 2 weeks. In order to observe the newly formed
dentine, tetracycline was injected on the 1st, 3rd, 7th, and 14th
day after the operation. Then, ground sections of teeth were observed under a
fluorescence microscope. The data was analyzed with Generalized Estimating
Equations (GEE) test. The mean distance between the lines of tetracycline
formed on the 1st and 14th day was significantly higher in the laser group
(P=0.005). Within the limitation of this study, irradiation of Ga-Al-As laser
(810 nm) can accelerate the rate of dentinogenesis in apexogenesis of immature
permanent teeth with MTA in dogs. Keywords: Pulpotomy , Low-level laser therapy , Mineral trioxide aggregate , Dog
Lasers in Medical Science vol 29, No 2 March 2014 |