Comparative assessment of manual, rotary and reciprocating instruments for removal of root fillings, using stereomicroscope: An in vitro study

Abstract

Background: To investigate the efficiency of Hedstrom (H; Dentsply Maillefer) file, Protaper Universal Retreatment system (PTUR; Dentsply Maillefer), Mani NRT-GPR files (Mani, Japan) and WaveOne (WO; Dentsply Maillefer) Reciprocating files in removing Gutta Percha (GP) and sealer from root canals.
 Methods: Sixty canals with less than 10° curvature from extracted human maxillary incisors were used. Root canal reinstrumentation was performed with H, PTUR, Mani NRT-GPR and WO files. Amount of residual root filling material (Gutta-percha and or sealer) were measured by using stereomicroscope. Data of GP or sealer remnants were statistically analyzed using one-way analysis of variance and Tukey test.
 Results: There were no significant differences among 4 groups in terms of residual root filling material in the apical third (p > 0.05). H-file group showed highest amount of root residual root filling as compared to groups.
 Conclusions: Reciprocating file system proved to be more efficient in removing the root canal fillings material than other retreatment file systems. H file group showed highest amount of root canal filling material.
 Bangladesh Med Res Counc Bull 2019; 45: 54-61

The Efficacy of Different Retreatment Protocols in the Removal of Root Canal Filling Materials from Oval Root Canal (An In-vitro Study)

“…23 Various techniques like radiography, digitized imaging, and cone-beam computed tomography are used to assess removal effectiveness, each with its limitations, affecting the precision of estimating remaining filling material. 12,24,25 This study employed a precise vertical tooth splitting method, enhancing image standardization at 20X magnification. It's a reliable approach compared to 2D radiographs.…”

“…Care was taken to avoid disrupting filling material during the cleaving process. 12 ImageJ software facilitated accurate measurements of canal and filler areas. 26 Research comparing continuous rotational motion and reciprocating motion in endodontic retreatment has shown mixed results.…”

“…Therefore, the potential impact of softening and dissolution effects may have been restricted in order to prevent the formation of a layer that adheres to the canal walls, thus creating difficulties during the removal process. 4,12 Colombo et al 17 conducted a study on the effectiveness of the rotary and reciprocation kinematics for gutta-percha removal, both with and without the use of a solvent. It was suggested that the utilization of a solvent aids in instrument penetration and might contribute to enhancing the overall cleanliness of the root canal system.…”

“…Then, the percentage of the remaining root filling material was calculated in each third according to the following equation: 12 Area % of remaining filling material = Area of remaining filling material × 100 Area of canal wall…”

Evaluation of the Efficacy of Neo-endo, Hyflex Re-treatment File Systems and H-Files for Removing Gutta-Percha From Root Canal Treated Tooth by Using Stereomicroscope—An In Vitro Study

“…[ 14 ] Evaluation under the stereomicroscope is considered a facile and effective method since the distance between the sample and the device is constant, thus standardizing the picture is made possible. [ 20 ]…”