The Efficacy of the WaveOne Reciprocating File System versus the ProTaper Retreatment System in Endodontic Retreatment of Two Different Obturating Techniques

Efficacy of the ProTaper retreatment system in removing Thermafil, GuttaCore or vertically compacted gutta‐percha from curved root canals assessed by micro‐CT

“…Time to reach working length was significantly shorter for GuttaCore specimens than for Thermafil or vertically compacted gutta-percha specimens, which is in accordance with recent studies that examined removal of these filling materials from curved root canals with ProTaper Retreatment files (Beasley et al 2013, Jorgensen et al 2017. Manufacturers of Gutta-Core have designed their carrier to be easily shredded by ProTaper Retreatment files, which explains the short removal time (Beasley et al 2013).…”

“…, Jorgensen et al . ). Manufacturers of GuttaCore have designed their carrier to be easily shredded by ProTaper Retreatment files, which explains the short removal time (Beasley et al .…”

“…, Jorgensen et al . ). Nevertheless, these studies did not evaluate the amount of residual filling material which is an important parameter for investigating the effectiveness of a retreatment technique as remnants of filling material may prevent canal walls being contacted by disinfecting agents (Zehnder & Paqué ).…”

“…Recently, a new core-carrier system was introduced by the manufacturer of Thermafil (Dentsply Sirona, Ballaigues, Switzerland) that consists of a cross-linked gutta-percha core (GuttaCore) instead of a plastic carrier. The time required to remove Gutta-Core from curved root canals when using ProTaper Retreatment files was significantly shorter than for Thermafil or vertically compacted gutta-percha (Beasley et al 2013, Jorgensen et al 2017. Nevertheless, these studies did not evaluate the amount of residual filling material which is an important parameter for investigating the effectiveness of a retreatment technique as remnants of filling material may prevent canal walls being contacted by disinfecting agents (Zehnder & Paqu e 2011).…”

Analysis of the quality of root canal preparation and retreatment using different instruments associated or not with different irrigant agitation protocols

“…Studies have shown a better performance with reciprocating instruments (18)(19), rotary (20)(21) and both presenting similar results (6,22). A possible explanation for the results found in the present study may be related to the design of the instruments.…”