• Juan Carlos Prados-Frutos, Rosa Rojo, José González-Serrano, Carlos González-Serrano, Gilberto Sammartino, José María Martínez-González, and Andrés Sánchez-Monescillo.
• J Am Dent Assoc. 2015 Oct 1; 146 (10): 751-9.e3.

BackgroundKnowing that patients desire reduced duration of local anesthesia, the authors performed a meta-analysis to evaluate the efficacy of phentolamine mesylate (PM) in reducing anesthesia duration and the occurrence of adverse effects.Types Of Studies ReviewedThe authors searched studies in 4 electronic databases up to December 18, 2014. For each study, the methodological quality was assessed according to the Cochrane Collaboration's tool for assessing risk of bias. Randomized controlled trials (RCTs) that used PM met the inclusion criteria.ResultsSix RCTs met the inclusion criteria and were used to carry out a meta-analysis of the effectiveness of PM and a qualitative analysis of its adverse effects. The use of PM was more effective in reversing the anesthetic effect on the lower lip and tongue than was applying a placebo. Adverse effects reported in the studies were not statistically significant, the most frequent being headache, pain during injection, and postprocedure pain.Conclusions And Practical ImplicationsBased on limited evidence, PM is effective in reducing the persistence of anesthesia duration on the lower lip and tongue, with infrequent adverse effects of little clinical significance.Copyright © 2015 American Dental Association. Published by Elsevier Inc. All rights reserved.

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