Efficacy of five rotary systems versus manual instrumentation during endodontic retreatment (original) (raw)
Related papers
The Journal of Contemporary Dental Practice
Aim: The aim of the present study was to evaluate the efficacy of different instrumentation for removal of gutta-percha and sealers in endodontic retreatment. Materials and methods: A total of single-rooted mandibular premolars were collected. Access opening was performed in all specimens. The working length was determined by reducing 1 mm from the length of instruments that were seen reaching the apex. All the canals were dried with paper points. Lateral condensation technique was used to obturate the canals with gutta-percha and zinc oxide eugenol was used as a sealer. The specimens were randomly segregated into three experimental groups. Group I: ultrasonic retreatment tip, group II: R-Endo retreatment files, group III: Mtwo retreatment files. Roots were grooved into two halves with a diamond disc in a longitudinal, buccolingual direction. A stereomicroscope with ×40 magnification was used to image the quantity of gutta-percha and sealer on canal walls. Results: With ultrasonic retreatment tip, least amount (1.96 ± 0.32) of gutta-percha and sealer remained, followed by Mtwo retreatment files (2.84 ± 0.24) and R-Endo retreatment files (3.18 ± 0.63). A statistically significant inter-group difference among different instrumentation groups was demonstrated by ANCOVA analysis. Conclusion: In the present study, ultrasonic retreatment tip file systems was found to be more effective in the removal of root canal filling material, followed subsequently by Mtwo retreatment file system and R-Endo retreatment file system. Clinical significance: Thorough removal of filling material from the root canals is essential during root canal retreatment for probable cleaning and shaping of canal morphology. Thus, clinicians should be aware of the suitable and better instrumentation system that provides a clean and sterile root canal system without any debris.
Efficacy of different rotary instruments for gutta-percha removal in root canal retreatment
Journal of …, 2006
The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary instruments compared with Hedström files for removal of guttapercha during retreatment. Sixty mandibular premolars with one single straight canal were instrumented with K-type files and filled using cold lateral compaction and sealer. The teeth were randomly divided into four groups of 15 specimens each. After repreparation with Gates Glidden burs and the test instruments the specimens were cleared. The area of remaining gutta-percha/sealer on the root canal wall was measured from two directions. The RaCe group showed significantly less residual obturation material than FlexMaster and Hedström group (p Ͻ 0.05; closed test procedure). There was no difference between ProTaper and all other instruments (p Ͼ 0.05). ProTaper and RaCe instruments required significantly less time for retreatment than FlexMaster and Hedström files (p Ͻ 0.05). One RaCe file, two ProTaper, and two FlexMaster instruments separated. RaCe cleaned obturated canals more effectively than hand files and FlexMaster files. (J Endod 2006;32:469 -472)
Journal of conservative dentistry : JCD
Endodontic retreatment is performed in teeth with endodontic failures. The main goal of retreatment is cleaning and shaping of the root canal with removal of old root filling material. Hand instruments and rotary instruments are mainly used for removing this filling material. To compare the relative efficacy of three rotary instrumentation systems for removal of gutta-percha from root canal during endodontic retreatment. To find out which NiTi system is more efficacious in retreatment and to check out the efficacy of retreatment with and without use of solvent. Sixty freshly extracted, single-rooted human mandibular premolars were instrumented with K-files, and each root canal was filled with gutta-percha and AH Plus (Dentsply Detrey, Konstanz, Germany) sealer using lateral compaction. Specimens were then divided into three experimental groups with twenty specimens each. Groups were then subdivided into ten specimens each. Groups were then retreated either with or without solvent. T...
Journal of Conservative Dentistry, 2017
Objectives: The aim of this in vitro study was to compare the efficacy of two retreatment rotary systems in the removal of Gutta-percha (GP) and sealer from the root canal walls with or without solvent. Materials and Methods: Forty-eight extracted human mandibular first premolars were prepared and obturated with GP and AH Plus sealer. Samples were then randomly divided into four groups. Group I was retreated with MtwoR rotary system without solvent, Group II was retreated with MtwoR rotary system with Endosolv R as the solvent, Group III with D-RaCe rotary system without solvent, and Group IV with D-RaCe rotary system and Endosolv R solvent. The cleanliness of canal walls was determined by stereomicroscope (×20) and AutoCAD software. Kruskal-Wallis test and Mann-Whitney U-test were used to compare the data. Results: Results showed that none of the retreatment systems used in this study was able to completely remove the root canal filling material. D-RaCe with or without solvent showed significantly (P > 0.05) less filling material at all levels compared to MtwoR with/without solvent. Conclusion: Within the limitation of the current study, D-RaCe rotary retreatment system is more effective in removing filling material from root canal walls when compared to MtwoR rotary retreatment system.
Vojnosanitetski pregled, 2019
Background/Aim. In order to achieve good results in endodontic retreatment, satisfactory removal of filling material and adequate debridement of the root canal is necessary. The aim of this in vitro study was to evaluate the efficacy of three rotary systems in removing gutta-percha/AH Plus and RealSeal SE obturation materials during retreatment using scanning electron microscopy. Methods. A total of 72 freshly extracted mandibular first incisors were enlarged to a size #30 using iRaCe NiTi instruments. Teeth were randomly divided into 6 groups of 12 specimens each. 36 teeth (groups 1, 2 and 3) were filled with AH Plus?/gutta-percha and another 36 (groups 4, 5 and 6) with Resilon (RealSeal SE system), both using lateral condensation technique. In groups 1 and 4, the retreatment was performed using the ProFile System, in groups 2 and 5 using the ProTaper Universal Retreatment System and in groups 3 and 6 using the D-RaCe system. After retreatment the teeth were split vertically into h...
Journal of clinical and experimental dentistry, 2016
Complete removal of old filling material during root canal retreatment is fundamental for predictable cleaning and shaping of canal anatomy. Most of the retreatment methods tested in earlier studies have shown inability to achieve complete removal of root canal filling. Therefore the aim of this investigation was to assess the efficacy of three different rotary nickel titanium retreatment systems and Hedstrom files in removing filling material from root canals. Sixty extracted mandibular premolars were decoronated to leave 15 mm root. Specimen were hand instrumented and obturated using gutta percha and AH plus root canal sealer. After storage period of two weeks, roots were retreated with three (Protaper retreatment files, Mtwo retreatment files, NRT GPR) rotary retreatment instrument systems and Hedstroem files. Subsequently, samples were sectioned longitudinally and examined under stereomicroscope. Digital images were recorded and evaluated using Digital Image Analysing Software. ...
International Endodontic Journal, 2012
Abramovitz I, Relles-Bonar S, Baransi B, Kfir A. The effectiveness of a self-adjusting file to remove residual guttapercha after retreatment with rotary files. International Endodontic Journal. Aim To test the efficacy of a two-stage retreatment method in which the Self-Adjusting File (SAF) is used to remove root canal filling residue left in the canal after using ProTaper Universal retreatment files. Method One of the curved mesial canals of 25 extracted mandibular molars was instrumented up to ProTaper F2, followed by NiTi K-files up to size 45 and filled. Radiographs of these canals served as a pretreatment control, which was later compared with those of the same canals after each stage of the retreatment procedure. Stage 1 consisted of ProTaper Universal D1-D3 retreatment files, which were used to remove the bulk of root filling material, followed by stage 2 in which a SAF file was applied to remove the remaining root canal filling residue. The amount of the radiopaque material in each third of the canal was evaluated before and after each stage, using buccolingual and mesio-distal radiographs. The amount of residue was expressed as the per cent of the root canal filled area, as measured in the pre-treatment control. The difference between the control and results of the first and second stages of retreatment was analysed using the Wilcoxon signed-rank test. Results Radiopaque residue was present after the use of the ProTaper Universal rotary files in 7.8 (±12.9)%, 12.9 (±13.9)% and 34.7 (±22.8)% of the coronal, midroot and apical areas, respectively. Following the supplementary application of the SAF, the amounts of residue were reduced to 2.6 (±3.7)%, 4.1 (±5.7)% and 6.7 (±9.4)% of the coronal, mid-root and apical canal areas, respectively (P < 0.01 for the coronal and mid-root and P < 0.001 for the apical third). Conclusion No system removed the root filling materials entirely. The use of the SAF after rotary instrumentation using ProTaper Universal retreatment files resulted in a significant reduction in the amount of filling residue in curved canals of mandibular molars.
The Journal of Contemporary Dental Practice
Aim: One of the common dental procedures employed these days in patients with irreversible pulpitis is root canal therapy. In retreatment cases, it is necessary for complete removal of obturate gutta-percha (GP) from obturate root canal system. Various methods and techniques are available these days for this purpose. This study was aimed to assess the efficacy of D-RaCe files, ProTaper retreatment files, Mtwo retreatment files, and manual Hedstrom files (H-files) in removing filling materials from the root canals of the endodontically treated teeth. Materials and methods: The present study included comparative evaluation of efficacy of nickel-titanium (NiTi) retreatment instruments and H-files in removing GP and sealer from root canals. All the samples were randomly and broadly divided into four study groups based on the instrumentation technique for removing the root canal fillings. Evaluation of the results was done based on operating time and remaining root canal filling material. Stereomicroscopic evaluation of the samples was done at 8× magnification. Results: All the results were assessed and analyzed by Statistical Package for the Social Sciences (SPSS) software. Least quantity of filling material was left by ProTaper retreatment files. When put together in decreasing order, the efficacy of different study groups, in terms of mean time taken for retreatment, was found to be as follows: D-RaCe > ProTaper Retreatment > Mtwo Retreatment > H-file. Conclusion: No single technique can completely remove obturating fillings from the root canals of endodontically treated
The Armenian Journal, 2020
Present study aimed to compare the cleanliness of root canal walls after using ProTaper Universal Retreatment, NRT GPR nickel-titanium systems and Hedstrom hand files in curved root canals during root canal retreatment. Thirty simulated canals with a 30-degree curvature in resin blocks were instrumented up to #30.04 with ProTaper Next nickel-titanium rotary instruments and obturated using gutta percha and AH plus root canal sealer. The specimens were randomly divided into three groups (n=10 each). Removal of gutta-percha was performed with the following devices and techniques: Group 1 (H-files), Group 2 (ProTaper Universal Retreatment), and Group 3 (NRT GPR). The retreatment time was recorded for each specimen using a stopwatch. After radiographing in buccolingual and mesiodistal directions, the amount of remaining gutta-percha in the roots was quantified using Image J 2X software. Apically extruded debris was weighted using analytical balances. Statistical analysis was performed with one-way ANOVA test. The volume of remaining filling material was significantly less in H-files and NRT GPR groups than in ProTaper Universal Retreatment group (p<0.05). The total retreatment time was significantly shorter in the ProTaper Universal Retreatment and NRT GPR groups compared with the manual group (p<0.05). NRT GPR files were associated with significantly less extruded debris than with the ProTaper Universal Retreatment (p<0.05). Neither of the studied instruments completely removed the root filling material. NRT GPR files left less gutta-percha and sealer than ProTaper Universal Retreatment and H-files. The nickel-titanium rotary systems were significantly faster than the manual group in the time required for gutta-percha removal.