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International Journal of Dentistry
Volume 2017 (2017), Article ID 1435348, 5 pages
Clinical Study

An Observational Cohort Study on Delayed-Onset Infections after Mandibular Third-Molar Extractions

1Department of Management and Engineering, University of Padova, Stradella S. Nicola 3, 36100 Vicenza, Italy
2Department of Neurosciences, School of Dentistry, University of Padova, Via Giustiniani 3, 35128 Padova, Italy
3School of Dentistry, Department of Social and Preventive Dentistry, Sao Paulo State University (UNESP), Campus Araçatuba, R. José Bonifàcio 1193, 16015-050 Araçatuba, SP, Brazil

Correspondence should be addressed to Giulia Brunello

Received 13 December 2016; Accepted 30 April 2017; Published 21 May 2017

Academic Editor: Tommaso Lombardi

Copyright © 2017 Giulia Brunello et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objectives. The purpose of the present study was to investigate the occurrence and clinical features of delayed-onset infections after mandibular third-molar extractions. Method and Materials. An observational cohort study was conducted on 179 patients undergoing mandibular third-molar extraction between January 2013 and December 2015, for a total of 217 extractions. Data were recorded at the time of extraction , on suture removal seven days later , and 30 days after the extraction, when patients were contacted and asked about their healing process . The statistical analysis was performed with nonparametric tests. A value lower than 0.05 was considered statistically significant. Results. Eight delayed-onset infections were recorded, amounting to 3.7% of all extractions. The median time elapsing from the extraction to the delayed-onset infection was 35 days (IQR 28–40; min 24–max 49). Younger age and longer surgical procedures seemed to be more often associated with this complication. Conclusion. Delayed-onset infections after third-molar extractions are relatively rare postoperative complications characterized by a swelling, usually with a purulent discharge. Patients should be informed of this possibility, which might develop even several weeks after the extraction.