Kiyokawa Tomoyasu, Motoyoshi Mitsuru, Inaba Mizuki, Sano Remi, Saiki Akari, Torigoe Go, Asano Masatake, Shimizu Noriyoshi
Department of Orthodontics, Nihon University School of Dentistry.
Division of Clinical Research, Dental Research Center, Nihon University School Dentistry.
J Oral Sci. 2017;59(3):447-451. doi: 10.2334/josnusd.16-0551.
The purpose of this experiment was to investigate whether low-intensity pulsed ultrasound (LIPUS) irradiation can inhibit dentoalveolar ankylosis in transplanted rat teeth. LIPUS irradiation (the pulsed ultrasound signal had a frequency of 3.0 MHz, a spatial average intensity of 30 mW/cm, and a pulse ratio of 1:4) was performed on the face over the re-planted teeth of rats for 4 weeks. After the rats were euthanized, we measured mobility (Periotest value [PTV]) of the transplanted and control teeth using a Periotest. Finally, we performed histological evaluation to detect ankylosis. PTVs tended to be significantly lower for re-planted teeth than for control teeth. Histological evaluation revealed that the roots of all re-planted teeth were coalescent with alveolar bone. Furthermore, no ankylosis was observed in three-fifths of the re-planted teeth following LIPUS irradiation. These results indicate the potential efficacy of LIPUS to inhibit dentoalveolar ankylosis.
