Authors: Bystrom A, Claesson R, Sundqvist G.
Title: The antibacterial effect of camphorated paramonochlorophenol, camphorated phenol and calcium hydroxide in the treatment of infected root canals.
Journal: Endod Dent Traumatol
Date: Oct 1985
Citation: 1(5):170-5
Category: Irrigants and Medicaments
Evidence-based Ranking: 4
Purpose/Objectives: To evaluate the bacteriacidal efficacy of calcium hydroxide, camphorated phenol and camphorated paramonochlorophenol as root canal dressings.

Materials & Methods: 65 single-rooted teeth with necrotic pulps and intact pulp-chamber walls were studied. All teeth had radiographic evidence of periapical lesions. The mechanical preparation of the teeth was carried out at the first appointment. Twenty teeth were irrigated with 0.5 % NaOCl and fifteen with 5% NaOCl. After drying the canals they were filled with CaOH using a lentulo spiral. Another thirty teeth were irrigated with 0.5% NaOCl and 15 were filled with camphorated phenol and 15 with camphorated paramonochlorophenol. Bacteriological samples were taken at three different appointments. At the first appointment a control sample was taken with a charcoaled paper point. At the second appointment, 1 month later for canals filled with CaOH and 2 weeks later for canals filled with camphorated phenol or camphorated paramonochlorophenol the dressing was removed and a second sample taken. The dressings were removed and the teeth sealed. At the third appointment after 2 to 4 days a final sample was taken. The samples were cultivated under anaerobic conditions.

Results: Bacteria were found in all initial samples. In the canals filled with CaOH bacteria could not be recovered from any of the canals after being dressed for one month. 2-4 days after the dressing had been removed bacteria was recovered from 1 of the 35 root canals. When looking at the teeth treated with camphorated phenol or camphorated paramonochlorophenol after 2 weeks 20 out of the 30 teeth showed no bacteria present.

Authors Conclusions: Calcium hydroxide paste as a dressing in carefully instrumented and irrigated root canals kills the bacteria so effectively that endodontic treatment of primarily infected root canals can be completed in 2 appointments.

Validity of Conclusions: fair

Reviewers Comments: questionable materials and methods