Bacterial removal promoted by 2 single-file systems: Wave One and One Shape.

Introduction: Different single-file systems are available for endodontic treatment; however, comparative studies are scarce. Thus, the present study evaluated bacterial reduction promoted by 2 single-file systems: Wave One (Dentsply Maillefer, Ballaigues, Switzerland) and One Shape (Micromega, Besancon, France).

Methods: Forty-five distobuccal root canals of upper molars sterilized with ethylene oxide were infected with Enterococcus faecalis for 21 days, and then root canal initial bacterial sample was collected with paper cones and plated on M-enterococcus agar.

Effectiveness of different chemical agents for disinfection of gutta-percha cones.

This aim of this study was to evaluate and compare the efficacy of different chemical methods to disinfect gutta-percha cones (GP). Eighty-six size 80 GP cones were used. The cones were contaminated by immersion in saliva and Enterococcus faecalis.

Comparison of debris extruded apically and working time used by ProTaper Universal rotary and ProTaper retreatment system during gutta-percha removal.

Objective: The aim of this study was to evaluate the in vitro action of ProTaper retreatment files and ProTaper Universal in the retreatment of mandibular premolars.

Material And Methods: The amount of debris extruded apically was measured and the time to reach the working length and to complete the removal of gutta-percha was observed. Thirty teeth had their canals prepared using ProTaper Universal files and were obturated by the single cone technique.

In vivo study of the Nd:YAP laser in persistent periapical lesion.

Objective: The aim of this study was to evaluate the therapeutic effect of ND:YAP laser in persistent lesions through signs and symptoms such as the presence of fistulas and pain, respectively.

Background Data: Periapical lesions with bacterial invasion, giving origin to bacterial infections, appear many times during the endodontic treatment, which aims at preparing and disinfecting the root canal system, in canals with mortified pulp. The endodontic treatment aim at eliminating infections and reinfection prevention; however, sometimes re-treatment is necessary, and it can be complemented with paraendodontic surgery due to reinfection, which can also persist.