Periodontal pathogens in erupting third molars of periodontally healthy subjects

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Periodontal pathogens in erupting third molars of periodontally healthy subjects
International Journal of Oral and Maxillofacial Surgery
Volume 36, Issue 9, September 2007, Pages 818-821

A. Rajasuo 1, O.J. Sihvonen, 2, 3, M. Peltola, 4, 5 and J.H. Meurman, 6, 7
1- Department of Oral and Maxillofacial Diseases, Mikkeli Central Hospital, Mikkeli, Finland
2- Kouvola Region Health Centre, Kouvola, Finland
3- Finnish Defence Forces, Valkeala Garrison Hospital, Valkeala, Finland
4- Veijolankuja 2 A 2, Oulu, Finland
5- Finnish Defence Forces, Pohja Military Hospital, Oulu, Finland
6- Institute of Dentistry, University of Helsinki, Helsinki, Finland
7- Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital, Helsinki, Finland

Accepted 2 May 2007. Available online 12 July 2007.

The presence of Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia and Tannerella forsythensis in bacteriologic samples of 5Ò7-mm deep mandibular third-molar pericoronal pockets was analysed by polymerase chain reaction, to test the hypothesis that these sites would harbour the bacteria. The patients were periodontally healthy 20-year-old Finnish male conscripts. Sixteen had acute pericoronitis, 28 chronic pericoronitis, and 15 were symptom-free controls. A. actinomycetemcomitans was detected in only 7% of the samples from chronic pericoronitis cases, whereas P. gingivalis was positive in 20% of the symptom-free versus 69% (P = 0.018) of the acute and 57% (P = 0.044) of the chronic cases. The percentages for P. intermedia were 93, 94 and 93%, and for T. forsythensis 47, 63 and 57%, respectively. These results confirm that, apart from A. actinomycetemcomitans, periodontopathogens are common in third-molar sites in periodontally healthy individuals.

Key words: pericoronitis; molar, third; periodontal diseases; bacteria, anaerobic; polymerase chain reaction

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