Scanning electron microscopy of superficial defects in Twisted files and Reciproc nickel–titanium files after use in extracted molars

Abstract

Instrumentation was possible for six root canals with TF files and nine root canals with R25 files before the presence of superficial defects appeared. Differences in the prevalence and development of superficial defects were observed between the TF and R25 files.

Scanning electron microscopy with energy dispersive X-ray spectrophotometry analysis of reciprocating and continuous rotary nickel-titanium instruments following root canal retreatment

“…This finding is in accordance with that of previous studies reporting a fracture rate for single-use Ni-Ti instruments <1% (19,20). In another study, Reciproc R25 instruments have been reported to not fracture until the 12th use for root canal shaping, although it has still been suggested that Reciproc R25 files should be single-use instruments (21). Reciproc instruments also have an S-shaped cross-sectional design, and this design enables superior cutting efficacy (16).…”

Fracture incidence of instruments from a single‐file reciprocating system by students in an endodontic graduate programme: a cross‐sectional retrospective study

“…) and it was also reported that it is possible to perform instrumentation of up to nine root canals using single‐file reciprocating systems with no failure (Caballero et al . ). In this way, the reuse of reciprocating files has had reasonable results as it is a common practice adopted in many countries around the world for economic reasons (Bueno et al .…”

HyFlex EDM: superficial features, metallurgical analysis and fatigue resistance of innovative electro discharge machined NiTi rotary instruments

“…, Caballero et al . ). Micrographs obtained on new EDM files revealed an irregular and a ‘crater‐like’ surface that is typical superficial morphology of ED‐machined materials.…”