Evaluation of WaveOne Gold system and ProTaper Retreatment for gutta-percha removal. Rev. Assoc. Paul. Cir. Dent. []. 2016, 70, 2, pp. 181-186. ISSN 0004-5276.

Objective: This ex vivo research study aims to evaluate ex vivo the amount of remaining gutta -percha during canal retreatment of lower premolars single-rooted using WaveOne Gold system compared with Protaper R system. Materials and methods: 52 mandibular premolars were selected and randomly divided into 2 groups (n = 26), according to the retreatment techniques, which are: WaveOne Gold system (group 1) and ProTaper R system (group 2). After the root canals were instrumented and filled with gutta-percha, they underwent removal procedure. After retreatment procedure, the teeth were sectioned in the proximal surfaces resulting in two hemi-sections exposing the interior of the root canal. All samples were coded and photographed by A640 Canon machine attached to the microscope Zeiss with zoom in 5 times, and the photos were transported to the Image Tool 3.0. software. The evaluation was done by measurement of areas of remaining filling material and the total area of the interior of root canal through the images on the computer. The measurements were compared for each system using Bio- Estat 4.0 program and Mann-Whitney test. Results: The smallest percentage of remaining gutta-percha occurred in ProTaper Retreatment system with significant differences from the WaveOne Gold system (p <0.01).Conclusion: ProTaper R system was more effective in removing gutta-percha compared with WaveOne Gold system. However none of the both systems completely removed the filling material.

: retreatment; gutta-percha; endodontics..