The effect of blue thermal treatment on endodontic instruments and apical debris extrusion during retreatment procedures

Abstract

Aim To determine the effect of blue thermal treatment on Reciproc (VDW, Munich, Germany) endodontic instruments and the amount of apically extruded debris during retreatment procedures. Methodology Thirty extracted mandibular molar teeth having mesial roots with a degree of curvature less than 20° and having an initial apical size equivalent to a size 10 K‐file were selected. The mesial roots of the teeth were removed from the cementoenamel junction to obtain a 15‐mm root length. The mesiobuccal canals were prepared to size F2 using the ProTaper Universal system (Dentsply Sirona, Ballaigues, Switzerland), filled with gutta‐percha and 2Seal (VDW) using the lateral compaction technique and then randomly divided into two groups (n = 15). The root fillings were removed with one of the following instruments using a crown‐down preparation technique: M‐Wire Reciproc or Reciproc Blue (both VDW). Apically extruded debris was collected in pre‐weighed Eppendorf tubes. The Eppendorf tubes were then stored in an incubator at 70 °C for five days to evaporate the distilled water. The data were analysed using the Mann–Whitney U test (P = 0.05). Results Reciproc Blue (1.42 ± 0.4491 mg) extruded significantly less debris apically than M‐Wire Reciproc (2.56 ± 1.0232 mg) (P < 0.05). Conclusions Blue thermal treatment of Reciproc instruments was associated with less debris extrusion during retreatment procedures.

Secondary Root Canal Treatment with Reciproc Blue and K-File: Radiographic and ESEM-EDX Analysis of Dentin and Root Canal Filling Remnants

“…Many recent investigations performed with micro-CT technique but different NiTi instruments confirmed that the different retreatment technique is not able to completely remove debris of filling materials [ 8 , 17 , 18 ]. The results of the present study are in the same directions of previous investigations made with micro-CT and other methods on different NiTi instruments [ 10 , 19 , 35 , 36 ].…”

A critical analysis of research methods and experimental models to study apical extrusion of debris and irrigants

“…Recently, there is a tendency to perform apical extrusion studies focusing on root canal preparation systems with innovative manufacturing properties (Al‐Omari et al, 2021; Bürklein et al, 2021; Doganay Yildiz & Arslan, 2019; Duzgun et al, 2021; Elashiry et al, 2020; Mustafa et al, 2021; Uslu et al, 2018). These systems with different designs, alloy treatments and instruments which convert their phases at body temperature are being investigated in terms of extrusion.…”

“…There are some drawbacks associated with the method, which necessitates the extrapolation of results with some caution despite all efforts for the standardization of samples. Firstly, the experimental model does not allow the simulation of the presence of vital pulp tissue or periapical tissues which may serve as barriers controlling the amount of extrusion under in vivo conditions (de Deus et al, 2014; Doganay Yildiz & Arslan, 2019; Ferraz et al, 2001; Kfir et al, 2018; Parirokh et al, 2012; Yeter et al, 2013). It has been reported that the lack of vital pulp tissue or necrotic tissues that may remain within lateral canals and apical ramifications could affect the results of laboratory studies (Topcuoglu et al, 2016b).…”

Metallurgical characterisation and torsional resistance of blue thermomechanically treated nickel titanium instruments after simulated ex vivo retreatment procedure

“…Reciproc R25 instrument has a 0.25 mm apical size, 0.08 taper and S‐shaped cross‐sectional design (10). Reciproc instruments have been suggested for canal shaping and retrieval of canal fillings (11). Several studies have reported its superior shaping ability during root canal preparation (9) and retreatment (10,12) compared to conventional NiTi.…”