Homan Zandi1, Renata C V Rodrigues2, Anne K Kristoffersen3, Morten Enersen3, Ibrahimu Mdala4, Dag Ørstavik5, Isabela N Rôças2, José F Siqueira2. 1. Department of Endodontics, Institute of Clinical Dentistry, University of Oslo, Oslo, Norway; Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway. Electronic address: homanz@odont.uio.no. 2. Department of Endodontics, Estácio de Sá University, Rio de Janeiro, Rio de Janeiro, Brazil. 3. Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway. 4. Department of General Practice, University of Oslo, Oslo, Norway. 5. Department of Endodontics, Institute of Clinical Dentistry, University of Oslo, Oslo, Norway.
Abstract
INTRODUCTION: This study compared the antibacterial effects of 1% sodium hypochlorite (NaOCl) and 2% chlorhexidine digluconate (CHX) during retreatment of teeth with apical periodontitis. METHODS:Root canal-treated teeth with apical periodontitis were randomly distributed into 2 groups. Bacteriological samples were taken from the canals before (S1) and after (S2) preparation using either NaOCl or CHX irrigation and after calcium hydroxide medication (S3); 16S ribosomal RNA gene-based real-time quantitative polymerase chain reaction was performed to quantify total bacteria, streptococci, and Enterococcus faecalis. RESULTS: Forty-nine teeth were available for analysis (NaOCl, n = 20; CHX, n = 29). Bacterial DNA occurred in all S1 samples, streptococci in 57% and E. faecalis in 6%. The total bacterial counts decreased from S1 to S2 in both groups (P < .01) but were higher in S3 than S2 (P < .01). Thirty-five percent of the teeth in the NaOCl group were positive in S2, decreasing to 20% in S3. In the CHX group, 41% were positive in S2, decreasing to 31% in S3. The bacterial load in S1 influenced the incidence of bacteria in S2 (P < .01). Streptococci were significantly reduced in both groups, and E. faecalis was found in only 1 S2 sample and not in S3. No significant difference between NaOCl and CHX was found. CONCLUSIONS:NaOCl and CHX both reduced bacterial counts and the number of infected canals. Intracanal medication with calcium hydroxide reduced the number of canals with persistent infection but resulted in overall larger bacterial counts in the cases positive for bacteria. The effectiveness of antimicrobial treatment can be influenced by the initial bacterial load.
RCT Entities:
INTRODUCTION: This study compared the antibacterial effects of 1% sodium hypochlorite (NaOCl) and 2% chlorhexidine digluconate (CHX) during retreatment of teeth with apical periodontitis. METHODS: Root canal-treated teeth with apical periodontitis were randomly distributed into 2 groups. Bacteriological samples were taken from the canals before (S1) and after (S2) preparation using either NaOCl or CHX irrigation and after calcium hydroxide medication (S3); 16S ribosomal RNA gene-based real-time quantitative polymerase chain reaction was performed to quantify total bacteria, streptococci, and Enterococcus faecalis. RESULTS: Forty-nine teeth were available for analysis (NaOCl, n = 20; CHX, n = 29). Bacterial DNA occurred in all S1 samples, streptococci in 57% and E. faecalis in 6%. The total bacterial counts decreased from S1 to S2 in both groups (P < .01) but were higher in S3 than S2 (P < .01). Thirty-five percent of the teeth in the NaOCl group were positive in S2, decreasing to 20% in S3. In the CHX group, 41% were positive in S2, decreasing to 31% in S3. The bacterial load in S1 influenced the incidence of bacteria in S2 (P < .01). Streptococci were significantly reduced in both groups, and E. faecalis was found in only 1 S2 sample and not in S3. No significant difference between NaOCl and CHX was found. CONCLUSIONS:NaOCl and CHX both reduced bacterial counts and the number of infected canals. Intracanal medication with calcium hydroxide reduced the number of canals with persistent infection but resulted in overall larger bacterial counts in the cases positive for bacteria. The effectiveness of antimicrobial treatment can be influenced by the initial bacterial load.
Authors: Marlos Barbosa-Ribeiro; Rodrigo Arruda-Vasconcelos; Adriana de-Jesus-Soares; Alexandre Augusto Zaia; Caio Cezar Randi Ferraz; José Flávio Affonso de Almeida; Brenda P F A Gomes Journal: Clin Oral Investig Date: 2018-10-26 Impact factor: 3.573