Influence of calcium hydroxide intracanal dressings on the prognosis of teeth with endodontically induced periapical lesions.

By Weiger R, Rosendahl R, Lost C.

Date: 08/2001
Journal: JOE


to explored the influence of calcium hydroxide as an interappointment dressing on the healing of periapical lesions associated with pulpless teeth that had not been endodontically treated previously. This was achieved by comparing the prognosis after a two-visit root canal treatment with that following a one-visit treatment.

•N= 73 patients (67 recalled) Inclusion: no antibiotics taken in the 4 weeks before endodontic therapy, teeth not previously treated, no pocket, no response to vitality tests, PA lesion present.


  •Access cavity prepared, GG, 1% NaOCl irrigation, preparation up to apical size of ≥#40  in straight canals and ≥#30 in curved canals.

•36 teeth were obturated in the same visit by lateral condensation with GP and CaOH sealer, 31 teeth were obturated similarly in a second visit after CaOH intra canal- placement  for 7-47 days.

•clinical and radiographical signs and symptoms were recorded pre and post operatively.

•Time intervals planned for follow-up were 6 months and 1, 2, 3, 4 and 5 years.

•The criteria for success were the absence of signs and symptoms indicating an acute phase of periapical periodontitis and radiographically a periodontal ligament space of normal width.

Most highlighted Results: 

•In both treatment groups the likelihood that the root canal treatment yields a success within an observation time of  5 years exceeded 90%.

•No statistical difference could be detected between the two groups in the probability of complete healing occurrence.

Clinical significance:

  One-visit RCT is as successful as 2 visits RCT with CaOH intra-canal medicament.