The efficacy of laser, ultrasound and self-adjustable file in removing smear layer debris from oval root canals following retreatment: A scanning electron microscopy study

Aust Endod J. 2016 Dec;42(3):104-111. doi: 10.1111/aej.12145. Epub 2016 Jan 20.

Abstract

This study aims to compare the efficacy of different irrigation activation methods to remove smear layer and debris from oval-shaped root canals following retreatment. Ninety mandibular canines with oval-shaped root canals were selected. Retreatment was performed with R-Endo retreatment files. The samples were randomly divided into six groups (n = 15). Groups were assigned according to agitation technique: R-Endo with classic irrigation, with self-adjustable file, with passive ultrasonic irrigation, R-Endo + Er:YAG, R-Endo + PIPS and R-Endo + Nd:YAG. Compared with the classic irrigation (R-Endo + CI) group, all other groups were more successful in reducing smear layer and debris (P < 0.05). The least amount of residual smear layer and debris was detected in the Er:YAG laser group (P < 0.05). Additional use of different agitation methods contributes to removal of debris and smear layer following root canal filling removal with rotary instruments; however, none of the techniques tested render root canal walls completely free of smear layer or debris.

Keywords: Er:YAG laser; Nd:YAG laser; PIPS laser; SAF; retreatment; ultrasonic.

MeSH terms

  • Dental Pulp Cavity*
  • Humans
  • Microscopy, Electron, Scanning
  • Retreatment
  • Root Canal Irrigants
  • Root Canal Preparation*
  • Smear Layer*

Substances

  • Root Canal Irrigants