title: Only a small percentage of patients experience persistent pain for more than 6 months after root canal therapy.
abstract: BACKGROUND
  Frequency of persistent tooth pain after root canal therapy: a systematic review and meta-analysis. Nixdorf DR, Moana-Filho EJ, Law AS, McGuire LA, Hodges JS, John MT. J Endod 2010;36(2):224-30.
  
  
  METHODS
  Analia Veitz Keenan, DDS.
  
  
  OBJECTIVE
  The aim of the study was to assess the frequency of pain at 6 months or more in association with endodontically treated permanent teeth.
  
  
  BACKGROUND
  Information not available.
  
  
  METHODS
  Systematic review with meta-analysis.
  
  
  METHODS
  Level 1: Good-quality patient-oriented evidence. STRENGTH OF THE RECOMMENDATION GRADE: Grade A: Consistent, good-quality patient-oriented evidence.
authors.affiliation: Private Practice, PI PEARL NETWORK, Brooklyn, NY 11229, USA. av244@nyu.edu
authors.forename: Analia Veitz
authors.initials: AV
authors.lastname: Keenan