title: Presence of root canal treatment has no influence on periodontal bone loss.
abstract: OBJECTIVE
  The aim of this study was to compare the interproximal bone level at root canal-filled teeth and non-root canal-filled teeth.
  
  
  METHODS
  The records of patients from the department were consecutively screened from January 2009 to October 2011. The distance between the coronal reference point to the alveolar bone crest (AC) was assessed at the mesial and distal aspects of root canal-filled teeth (RCF+) and their contralateral non-root canal-filled teeth (RCF-) on periapical radiographs. Generalised linear mixed-effects models were applied.
  
  
  RESULTS
  The sample consisted of 128 pairs of teeth comprising data from 72 patients. The results for AC revealed a median distance of 3.2 mm for RCF+ and 3.4 mm for RCF- (p = 0.61). Using the maximal distance on either the distal or the mesial tooth surface, a median distance of 3.6 mm was detected for RCF+ and 3.8 mm for RCF-, respectively (p = 0.42). Even after taking several tooth- and subject-specific variables into account, the differences between AC on RCF+ and RCF- were statistically not significant (p > 0.05).
  
  
  CONCLUSIONS
  The interproximal bone loss did not differ statistically significant between root canal-filled teeth and non-root canal-filled teeth.
  
  
  CONCLUSIONS
  Existence of appropriately done root canal fillings in periodontitis patients has no effect on the prognosis of periodontal disease.
authors.affiliation: Department of Periodontology Endodontology and Cariology, University Centre for Dental Medicine, University of Basel, Hebelstrasse 3, CH-4056, Basel, Switzerland.
authors.forename: Fabiola-Regina
authors.initials: FR
authors.lastname: Rodriguez
authors.affiliation: Department of Periodontology Endodontology and Cariology, University Centre for Dental Medicine, University of Basel, Hebelstrasse 3, CH-4056, Basel, Switzerland.|Volkszahnklinik Basel, University Centre for Dental Medicine, Basel, Switzerland.
authors.forename: Nadine
authors.initials: N
authors.lastname: Paganoni
authors.affiliation: Department of Periodontology, Center of Dentistry and Oral Medicine (Carolinum), Johann Wolfgang Goethe-University Frankfurt, 60596, Frankfurt, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Eickholz
authors.affiliation: Department of Periodontology Endodontology and Cariology, University Centre for Dental Medicine, University of Basel, Hebelstrasse 3, CH-4056, Basel, Switzerland.
authors.forename: Roland
authors.initials: R
authors.lastname: Weiger
authors.affiliation: Department of Periodontology Endodontology and Cariology, University Centre for Dental Medicine, University of Basel, Hebelstrasse 3, CH-4056, Basel, Switzerland. clemens.walter@unibas.ch.
authors.forename: Clemens
authors.identifier: http://orcid.org/0000-0002-9967-1570
authors.initials: C
authors.lastname: Walter
mesh_terms: D016301:Alveolar Bone Loss / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012390:Root Canal Therapy
keywords: Attachment level; Periodontal disease; Radiology; Root canal treatment