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. 2016 May 27;16:61. doi: 10.1186/s12903-016-0222-z

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Flow chart depicting the decisions why patients were excluded from the study. All emergency patients presenting with severe pain originating from a single endodontically involved tooth in the course of 64 weeks were initially considered. Teeth diagnosed with an acute apical abscess were then excluded. SIP symptomatic irreversible pulpitis, SAP symptomatic apical periodontitis.