Objective: To evaluate the effects of the irradiation with low-intensity pulsed ultrasound (LIPUS) on orthodontic intrusive movement.
Methods: A total of three Beagle dogs were selected for the present study. Impressions were taken to elaborate silver-palladium
crowns of the 4th lower premolars. After that, the crowns were cemented and temporary anchorage devices (TADs), miniscrew type
were placed to obtain maximum anchorage. A week later, 150 g intrusive force was applied on both sides for a total of four weeks.
The right side was used as control, whereas the left side was irradiated with LIPUS (3.0 MHz for 15 min daily) during the first seven
days after the intrusive force was applied. Dental X-rays were taken to measure the amount of movement. Results: The experimental
sides of two dogs presented slightly greater amount of intrusion (experimental = 98,02 and 97,96%). Unfortunately, one dog was
excluded of the final analysis because the TADs were lost before the study was completed. Conclusions: Within the limitations of
this study, the irradiation with LIPUS has a positive effect on the orthodontic movement of intrusion. However, the main
disadvantage of this procedure is the time required for the application of the LIPUS.
(Rev Esp Ortod. 2009;39(2):085-089)