Bacteriologic evaluation of the efficacy of mechanical root canal instrumentation in endodontic therapy

Abstract

– The presence of bacteria in 15 single‐rooted teeth, with periapical lesions, was studied throughout a whole period of treatment. The root canals were irrigated with physiologic saline solution during instrumentation. No antibacterial solutions or dressigs were used. Bacteria were found in all irnitial specimens form the teeth (median numver of bacterial cell 4x105; range 102‐107) and the number of strains in the specimens ranged from 1 to 10.88% of the strains were anaerobic. The most commonly isolated species were: Peptostreptococcus micros, Peptostrcptococcus anacrobius, Fusobacterium nucleatum, Bacteroides oralis, Bacteroides melaninogenicus subsp. intermedius and Eubacterium alactolyticum. Mechanical instrumentation reduced the number of bacteria considerably. Specimens taken at the beginning of each appointment usually contained 104‐106 bacterial cells and at the end 102‐103fewer. Bacteria were eliminated from the root canals of eight teeth during the treatment. In seven root canals bacteria presisted despite treatment on five successive occasions. There was no evidence that specific microorganisms were implicated in these persistent infections. Teeth where the infection persisted despite being treated five times were those with a hig number of bacteria in the initial sample.

Rotation or reciprocation: a contemporary look at NiTi instruments?

“…However, mechanical and chemomechanical debridement of root canals has been shown to significantly reduce bacterial counts, but not render canals consistently bacteria free. 2,3 The reason that root canal treatment works is because of the reduction in the microbial content of canal systems and therefore its pathogenicity sufficiently to promote radicular healing.…”

Tratamiento De Una Reabsorción Externa Inflamatoria Con Trióxido De Mineral Agregado: Reporte De Un Caso

“…Posteriormente, el conducto fue obturado con un apósito de hidróxido de calcio en pasta, Calcifar -P (Eufar ® ) (Figura 2 y 3). [21][22][23][24][25][26][27][28][29][30][31][32][33] Figura 2. Estimación de la longitud de trabajo en 20 mm.…”

The Antibacterial Effect of a Diode Laser Used as an Adjunct Irrigant on Clinical Isolate of Enterococcus Faecalis Biofilm (In Vitro)

“…. However, after five visits without antibacterial medication, the count had increased by 50% [8]. Peters et al (2001) found that mechanical preparation left more than 35% of the canal space uncleared, which could lead to the failed elimination of bacteria from the root canal [9].…”