title: [Analysis of relationship between the detection of Enterococcus faecalis in post-treatment endodontic disease and clinical symptom or sign].
abstract: OBJECTIVE
  To detect the Enterococcus faecalis (E. faecalis) in post-treatment endodontic disease, and to analyze the relationship between the occurrence of E. faecalis and clinical symptom.
  
  
  METHODS
  108 teeth which need root canal retreatment were collected, and the clinical symptoms and physical signs were recorded. Bacterium samples from root canal were taken, and genome DNA from bacterial samples were extracted. The occurrence of E. faecalis by means of the polymerase chain reaction was investigated.
  
  
  RESULTS
  The detection rate of E. faecalis in cases of root canal retreatment was 47.2%, while in cases with symptoms or signs, or cases with both symptoms and signs, the root canal E. faecalis detection rates were 52.6%, 57.9%, 62.5%. The detection rates of E. faecalis between cases with clinical symptom and without clinical symptom demonstrated statistical significance (P < 0.05). The detection rates between cases with both clinical symptom and manifestly aneretic root and cases without clinical symptom and manifestly aneretic root had statistical significance (P < 0.05). In the group of clinical symptom, the detection rate of E. faecalis in cases with biting pain was 66.7%, clearly higher than those without biting pain (P < 0.05).
  
  
  CONCLUSIONS
  The occurrence of E. faecalis in cases of root canal retreatment correlates with clinical symptoms.
authors.affiliation: Dept. of Oral Medicine, School of Stomatology, Dalian Medical University, Dalian 116044, China.
authors.forename: Wei-dong
authors.initials: WD
authors.lastname: Niu
authors.forename: Qi-yi
authors.initials: QY
authors.lastname: Song
authors.forename: Li-na
authors.initials: LN
authors.lastname: Wang
authors.forename: Jian-bo
authors.initials: JB
authors.lastname: Zheng
authors.forename: Chun
authors.initials: C
authors.lastname: Shi
authors.forename: Ji-yao
authors.initials: JY
authors.lastname: Li
authors.forename: Xue-dong
authors.initials: XD
authors.lastname: Zhou
mesh_terms: D001419:Bacteria; D003786:Dental Pulp Cavity; D013293:Enterococcus faecalis; D006801:Humans; D016133:Polymerase Chain Reaction; D019233:Retreatment; D012390:Root Canal Therapy; D014070:Tooth