Efficacy of five rotary systems versus manual instrumentation during endodontic retreatment

Abstract

The purpose of this study was to evaluate the efficiency of ProFile, GT, ProTaper, Race and K3 rotary instruments compared with hand K-files for removal of gutta-percha during retreatment. Sixty mandibular premolars were instrumented with GT rotary files and filled by thermomechanical compaction of gutta-percha and AH Plus sealer. The teeth are randomly divided into 6 groups of 10 specimens each. The roots were split longitudinally, digital images were created using a flatbed scanner, and the areas with remaining filling material were demarcated using Image Tool 1.21 software. The results indicate that GT left significantly less (p<0.05) remaining filling material (1.18 ± 1.47) than hand (3.70 ± 3.16) and Hero instruments (2.99 ± 2.58). There was no statistically significant difference (p<0.05) among the others techniques: ProFile (1.99 ± 2.66), ProTaper (2.00 ± 1.99) and K3 (2.71 ± 2.87) when compared with GT. In conclusion, GT, ProFile, ProTaper and K3 were more effective in removing gutta-percha than manual and Hero instruments.

Endodontic filling removal procedure: an ex vivo comparative study between two rotary techniques

“…Fariniuk et al 11 in 2011, Baratto Filho et al 20 in 2002 and Imura et al 21 in 2000 reported that it was impossible to completely remove all filling material with only rotary instruments. In the present study, the removal procedures in both groups were complemented with a Hedstroem hand file.…”

“…2,3 Retreatment is preferred over surgical alternatives 7,8 because this approach is less invasive. The main goal of retreatment is to remove all filling material in the root canal and regain access to the apical foramen, 1,2,[8][9][10][11][12][13] thereby enabling the insertion of new endodontic procedures 2,3,7,10 and the subsequent restoration of health of the periapical tissues. 7,13,14 Insufficient removal of filling material impairs the removal of necrotic tissue or remnant bacteria in the root canal and the reshaping and new filling, which leads to a lasting clinical and radiographic failure.…”

Efficacy of D‐RaCe and ProTaper Universal Retreatment NiTi instruments and hand files in removing gutta‐percha from curved root canals – a micro‐computed tomography study

“…2009) or rotary nickel–titanium (NiTi) instruments (Barrieshi‐Nusair 2002, Hülsmann & Bluhm 2004, Saad et al. 2007, Gergi & Sabbagh 2007, Fariniuk et al. 2011) with or without the use of solvents (Friedman et al.…”

Analysis of the presence of filling material in oval root canals using computed microtomography after endodontic retreatment performed by different techniques

“…Several studies have demonstrated that the complete removal of the root filling from the canal walls is not always possible [1][2][3][4][5][7][8][9][10][11][12] . The remaining filling material after retreatment has been described by its presence 8,9 , area 3,5,7,10,12 and volume 11,13 , through different analytical techniques using microscopy 9 , radiographies 3,8,10 , photographies 5,12 , and computed tomography 4,6,11,13 . However, the studies do not report in which canal walls filling material remained in larger amounts…”

“…Endodontic hand and rotary files are commonly designed to work in canals with conical shape 6 , what affects the action of files in regions presenting irregular configurations. A previous study, observed that the files could be deviated from the original canal path to the buccal aspect when instrumenting lower incisors with oval canals 17 .…”