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J Clin Periodontol. 2006 Sep;33(9):620-5. Epub 2006 Jul 20.

Bone level around endodontically treated teeth in periodontitis patients.

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Department of Periodontology, ACTA, Amsterdam, The Netherlands.



This retrospective study compared the marginal bone level of teeth with root canal fillings with contra-lateral teeth without.


Of 286 consecutive patients (> or =35 years), referred to practice for periodontology in the Netherlands, 67 full sets of radiographs contained > or =1 endodontically treated tooth and its contra-lateral tooth without root canal treatment. Bone level at the mesial and distal of these teeth was scored from the CEJ. In multi-rooted teeth, the presence of interradicular radiolucency was assessed. The presence of posts, and periapical radiolucencies was assessed. Analysis for differences between treated teeth and contra-laterals was controlled for tooth surface, presence of a post and tooth type.


The mean distance from the root filling to the apex was 2.6 mm. Periapical radiolucencies were found in 14%. The mean bone level was at 4.3 mm for endodontically treated teeth and at 3.7 mm for contra-laterals. Significantly more bone loss (0.6 mm) was found at the endodontically treated teeth. No difference was found between mesial and distal, teeth without and with posts and different tooth types. The presence of interradicular radiolucency was more frequent in endodontically treated teeth (OR 2.1, p(McNemar test)=0.039).


In periodontitis patients, teeth with endodontic treatment had more bone loss as compared with untreated contralaterals.

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