Effects of ultrasonic and high-speed air-driven devices on pulp-dentin reactions: An animal study
Journal
Journal of Dental Sciences
Journal Volume
9
Journal Issue
4
Pages
359-363
Date Issued
2014
Author(s)
Abstract
The aim of this study was to evaluate the pulp–dentin response after pulp chamber perforation by ultrasonic and high-speed air-driven devices. Eighteen upper incisors from nine dogs were used in this study. We prepared Class V cavity (3 × 5 mm) at the labial side after anesthesia. The pulp was then exposed/perforated by either an ultrasonic or high-speed air-driven device. We evaluated the hemorrhage condition by stopping the bleeding with varying numbers of sponge pellets. Three observation time points were set: immediate, 1 week (1-wk), and 2 weeks (2-wk). Then, we evaluated the pulp–dentin response using scanning electronic microscopy (SEM) and histological examination. The bleeding level caused by an ultrasonic device presented as either no bleeding or mild bleeding, and a high-speed air-driven bur caused worse bleeding conditions. The ultrasonic group showed better response in the immediate pulpal response. In 1 week, both methods presented no pulp necrosis, and those treated using the ultrasonic device presented with a regular odontoblastic layer under SEM observations. In the 2-wk group, both methods showed no pulp necrosis, whereas the high-speed device showed partial necrosis. SEM showed pulp tissue with lacerated wounds in those who had the high-speed device treatment. We conclude that the ultrasonic device causes less damage to the dental pulp tissue in comparison with the high-speed air-driven bur. Moreover, we expect that the ultrasonic device can be applied to vital pulp therapy—such as direct pulp capping, pulptotomy, or pulpectomy—due to its safe approach.
Publisher
Association for Dental Sciences of the Republic of China
Type
journal article