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Acta Odontol Scand. 2011 Nov;69(6):355-9. doi: 10.3109/00016357.2011.568967. Epub 2011 Mar 23.

Prevalence of apical periodontitis and factors associated with the periradicular status.

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Department of Endodontics and Restorative Dentistry, Faculty of Dentistry, University Mohammed V Souissi Rabat, Morocco.



The present study aimed at assessing the prevalence of apical periodontitis and identifying the factors associated with apical periodontitis, particularly the influence of the quality of root canal fillings and coronal restorations on the periradicular status.


The study population consisted of adult patients, men and women, seeking routine dental care at the Endodontic Clinic in the school teaching hospital between September 2006 and July 2008. For each patient complete oral examination and periapical radiographs were made for pathological teeth. All teeth were assessed individually. AP was diagnosed according to defined criteria, other variables were root fillings, coronal fillings, trauma and caries. The odds ratio and 95% confidence interval were used to calculate the risk of apical periodontitis related to tooth-specific risk indicators on the presence of apical periodontitis. A multiple logistic regression model to control for confounders and to determine their independent association with apical periodontitis was used also.


AP was detected on teeth (63.79%). The prevalence of apical periodontitis in root canal-treated teeth was 39.5%. Of the dental variables caries, trauma, inadequate root fillings and inadequate restoration were significantly associated with AP.


The prevalence of AP in this study group was higher than in other populations. The probability of AP increased significantly after root canal treatment and coronal filling and was closely associated with the quality of the filling.

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