Dental India Newsletter - 24th June 2007
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Endodontology
Bacteriologic investigation of the effects of
sodium hypochlorite and chlorhexidine during the endodontic treatment of
teeth with apical periodontitis José F. Siqueira Jr. DDS, PhD a, , , Isabela N.
Rôças DDS, PhD a, Simone S.M. Paiva DDS b, Tatiana Guimarães-Pinto
DDS b, Karen M. Magalhães DDS b and Kenio C. Lima DDS, PhD c aProfessor, Estácio de Sá University, Rio de Janeiro, RJ, Brazil. bGraduate students, Master's Program in Endodontics, Estácio de Sá University, Rio de Janeiro, RJ, Brazil. cProfessor, Federal University of Rio Grande do Norte, Natal, RN, Brazil. Received 27 December 2006; revised 8 January 2007; accepted 21 January 2007. Available online 11 May 2007. Objective
This clinical study was undertaken to compare the
effectiveness of 2.5% sodium hypochlorite (NaOCl) and 0.12%
chlorhexidine digluconate as irrigants in reducing the cultivable bacterial populations in infected root canals of teeth with apical periodontitis. Study design
According to stringent inclusion/exclusion criteria, 32
teeth with primary intraradicular infections and chronic
apical periodontitis were selected and followed in the study. Bacterial samples were taken at the baseline (S1) and after chemomechanical preparation using either NaOCl (n = 16) or chlorhexidine (n = 16) as irrigants (S2). Cultivable bacteria recovered from infected root canals at the 2 stages were counted. Isolates from S2 samples were identified by means of 16S rRNA gene sequencing analysis. Results
At S1, all canals were positive for bacteria, and the
median number of bacteria per canal was 7.32 × 105 for the NaOCl
group and 8.5 × 10 5 for the chlorhexidine group. At S2, the median number of bacteria in canals irrigated with NaOCl and chlorhexidine was 2.35 × 103 and 2 × 102, respectively. Six of 16 (37.5%) canals from the NaOCl group and 8 of 16 (50%) canals from the chlorhexidine group yielded negative cultures. Chemomechanical preparation using either solution substantially reduced the number of cultivable bacteria in the canals. No significant difference was observed between the NaOCl and chlorhexidine groups with regard to the number of cases yielding negative cultures (P = .72) or quantitative bacterial reduction (P = .609). The groups irrigated with NaOCl or chlorhexidine showed a mean number of 1.3 and 1.9 cultivable species per canal, respectively. The great majority of isolates in S2 were from gram-positive bacteria, with streptococci as the most prevalent taxa. Conclusions
The present findings revealed no significant difference
when comparing the antibacterial effects of 2.5% NaOCl and 0.12% chlorhexidine used as irrigants during the treatment of infected canals. |
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