title: [Clinical evaluation and laboratory study of ultrasonic irrigation of the root canal].
abstract: OBJECTIVE
  To assess the efficacy of ultrasonic irrigation of the root canal in vivo and in vitro.
  
  
  METHODS
  Sixty anterior teeth or premolars with the diagnosis of periapical periodontitis were divided into two groups (syringe irrigation group, group S and ultrasonic irrigation group, group U) and were evaluated clinically. Sixty extracted teeth with single straight canals were selected. Forty of them were divided into two groups and were evaluated histologically. Another twenty teeth were divided into two groups and were evaluated by SEM.
  
  
  RESULTS
  Clinically, the number of lateral canals obturated in group U was more than that in group S (P < 0.01). The incidence of pain during irrigation were 13.3% in group S, and 3.3% in group U (P > 0.05). Histologically, the amount of organic debris of the root canals in group U were significantly less than that in group S (P < 0.01). By SEM study, the number of visible open dentinal tubules in group U were significantly greater than that in group S (P < 0.05).
  
  
  CONCLUSIONS
  Ultrasonic irrigation of the root canal will be a useful technique in root canal therapy.
authors.affiliation: Department of Operative Dentistry and Endodontics, School of Stomatology, Wuhan University, Wuhan 430079, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Peng
authors.forename: Shu-lan
authors.initials: SL
authors.lastname: Chen
authors.forename: Bing
authors.initials: B
authors.lastname: Fan
authors.forename: Zhuan
authors.initials: Z
authors.lastname: Bian
authors.forename: Ming-wen
authors.initials: MW
authors.lastname: Fan
mesh_terms: D006801:Humans; D008963:Molar / Q000648:ultrastructure; D010483:Periapical Diseases / Q000628:therapy*; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D012390:Root Canal Therapy; D014465:Ultrasonics
chemical_list: D012388:Root Canal Irrigants