• Spencer Fullmer, Melissa Drum, Al Reader, John Nusstein, and Mike Beck.
• Private Practice, Reno, Nevada.
• J Endod. 2014 Jan 1;40(1):1-5.

IntroductionThe purpose of this prospective, randomized, double-blind, placebo-controlled study was to determine the effect of the administration of the combination acetaminophen/hydrocodone on the anesthetic success of mandibular posterior teeth in patients experiencing symptomatic irreversible pulpitis.MethodsOne hundred emergency patients in moderate to severe pain diagnosed with symptomatic irreversible pulpitis of a mandibular posterior tooth randomly received, in a double-blind manner, identical capsules of either a combination dose of 1000 mg acetaminophen/10 mg hydrocodone or placebo 60 minutes before the administration of a conventional inferior alveolar nerve (IAN) block. Endodontic access was begun 15 minutes after completion of the block, and all patients used for data analysis had profound lip numbness. Success was defined as no or mild pain (visual analog scale recordings) on pulpal access or instrumentation.ResultsThe success rate for the IAN block was 32% for the combination dose of 1000 mg acetaminophen/10 hydrocodone and 28% for the placebo dose, with no statistically significant difference between the 2 groups (P = .662).ConclusionsA combination dose of 1000 mg acetaminophen/10 mg hydrocodone given 60 minutes before the administration of the IAN block did not result in a statistically significant increase in anesthetic success for mandibular posterior teeth in patients experiencing symptomatic irreversible pulpitis.Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

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