• Zbys Fedorowicz, Esther J van Zuuren, Allan G Farman, Anirudha Agnihotry, and Jassim Hasan Al-Langawi.
• Bahrain Branch, The Cochrane Collaboration, Box 25438, Awali, Bahrain.
• Cochrane Db Syst Rev. 2013 Jan 1;12:CD004969.

BackgroundIrreversible pulpitis, which is characterised by acute and intense pain, is one of the most frequent reasons that patients attend for emergency dental care. Apart from removal of the tooth, the customary way of relieving the pain of irreversible pulpitis is by drilling into the tooth, removing the inflamed pulp (nerve) and cleaning the root canal. However, a significant number of dentists continue to prescribe antibiotics to stop the pain of irreversible pulpitis.ObjectivesTo assess the effects of systemic antibiotics for irreversible pulpitis.Search MethodsWe searched the Cochrane Oral Health Group's Trials Register (to 5 September 2013); the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2013, Issue 9); MEDLINE via OVID (1946 to 5 September 2013); EMBASE via OVID (1980 to 5 September 2013) and the US National Institutes of Health Trials Register (http://clinicaltrials.gov). There were no language restrictions in the searches of the electronic databases.Selection CriteriaRandomised controlled trials which compared pain relief with systemic antibiotics and analgesics, against placebo and analgesics in the acute preoperative phase of irreversible pulpitis.Data Collection And AnalysisTwo review authors screened studies and extracted data independently. We assessed the quality of the evidence of included studies using GRADEPro software. Pooling of data was not possible and a descriptive summary is presented.Main ResultsOne trial assessed at low risk of bias, involving 40 participants was included in this update of the review. The quality of the body of evidence was rated low for the different outcomes. There was a close parallel distribution of the pain ratings in both the intervention and placebo groups over the seven-day study period. There was insufficient evidence to claim or refute a benefit for penicillin for pain intensity. There was no significant difference in the mean total number of ibuprofen tablets over the study period: 9.2 (standard deviation (SD) 6.02) in the penicillin group versus 9.6 (SD 6.34) in the placebo group; mean difference -0.40 (95% confidence interval (CI) -4.23 to 3.43; P value = 0.84). This applied equally for the mean total number of Tylenol tablets: 6.9 (SD 6.87) used in the penicillin group versus 4.45 (SD 4.82) in the placebo group; mean difference 2.45 (95% CI -1.23 to 6.13; P value = 0.19). Our secondary outcome on reporting of adverse events was not addressed in this study.Authors' ConclusionsThis systematic review which was based on one low powered small sample trial assessed as a low risk of bias, illustrates that there is insufficient evidence to determine whether antibiotics reduce pain or not compared to not having antibiotics. The results of this review confirm the necessity for further larger sample and methodologically sound trials that can provide additional evidence as to whether antibiotics, prescribed in the preoperative phase, can affect treatment outcomes for irreversible pulpitis.

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