Periodontal ligament injection. An experimental study in the monkey.

In an experimental double blind, cross-over study in monkeys, the reactions of the periodontal tissue after periodontal ligament injection of local anaesthetic solution were investigated. Lidocaine 20 mg/ml with adrenaline 12.5 micrograms/ml and mepivacaine 30 mg/ml were used, and the injection times were 5 or 20 s. Histopathological analysis showed cell damage in the tissues near the injection areas immediately after the experimental procedure. In the specimens obtained one week after the periodontal ligament injections, the tissues were found to be normal.