Detection of the Bacteroidesm elaninogenicus Group and Bacteroides fragilis Group form Infected Root Canals of Primary Teeth and Children's Oral Cavities with a Fluorescent Anti-body Test Kit.

Abstract

The purpose of this study was to investigate the relationship between the Bacteroides melaninogenicus group and the Bacteroides fragilis group and the clinical findings of the periapical infected primary teeth, and to detect these Bacteroides groups from the oral cavityies of children. Bacteroides groups were determined with a fluoerscent anti-body test kit (Fluoretec-M and Fluoretec-F, Pfizer, Inc., U. S. A. )
The results are as follows:
1. The detection rates for the B. melaninogenicus group from closed, opened and root canals under treatment were 66.7,61.3 and 33.3%, respectively. There was no statistical relationshp between the existence of B. melaninogenicus group and the clinical findings (abscess or fistula formation, history of pre-endodontic therapy and root or alveolar bone absorption) of the periapical infected promary teeth.
2. B. melaninogenicus group detection rate was high from the dental plaque on the primary and permanent tooth surfaces of the school chidren, but low from that of the infants. The detection rate from the coating of the tongue, cheek mucosa, gingival abscess and saliva of the chilaren was 84.6,20.0,20.0 and 9.0%, respectively.
3. The B. fragilis group had a high detection rate from closed infected root canals of the primary teeth, the coating of the tongue and dental plaque from children. Furthermore, the B. fragilis group existed in all canals of the primary teeth with acute periapical infection.