scholarly journals The Efficacy of Reciprocating Instruments versus Continuous Rotary Nickel-Titanium Instruments in Root Canal Retreatment with Different Filling Materials

2019 ◽  
Vol 6 (2) ◽  
pp. 223-229
Author(s):  
Sara M. Galal ◽  
Wael H. Kamel ◽  
Mohsen M. Nour El-Deen
Keyword(s):  
Root Canal ◽  
Nickel Titanium ◽  
Filling Materials ◽  
Root Canal Retreatment ◽  
Reciprocating Instruments

Efficacy of Profile .04 taper series 29 in removing filling materials during root canal retreatment—an in vitro study

2009 ◽  
Vol 108 (6) ◽  
pp. e46-e50 ◽  
Author(s):  
Luciana Viti Betti ◽  
Clovis Monteiro Bramante ◽  
Ivaldo Gomes de Moraes ◽  
Norberti Bernardineli ◽  
Roberto Brandão Garcia
Keyword(s):  
Root Canal ◽  
In Vitro Study ◽  
Vitro Study ◽  
Filling Materials ◽  
Root Canal Retreatment

scholarly journals Evaluation of Three Ni-Ti Systems in Retreatment of Curved Root Canals Obturated by Gutta-Percha With iRoot SP

2021 ◽  
Author(s):  
Yi Chen ◽  
Weiping Tian ◽  
Lisha Wang ◽  
Fan Qi ◽  
Mengyu Sun ◽  
...  
Keyword(s):  
Root Canal ◽  
Filling Material ◽  
Micro Ct ◽  
Imaging Data ◽  
Root Canals ◽  
Filling Materials ◽  
Gutta Percha ◽  
Group I ◽  
Root Canal Retreatment ◽  
Curved Root Canals

Abstract Background To evaluate the retreatability of curved root canals obturated with gutta-percha (GP) and iRoot SP using three different Ni-Ti systems through micro-computed tomographic (micro-CT) analysis. Methods A total of 51 curved root canals of permanent molars with angles of curvature ranging from 20° to 40° were used. The root canals were prepared with the ProTaper Next (PTN) rotary system to size 25, .06 taper and filled with iRoot SP and GP using the single cone technique. Samples were randomly divided into three groups (n = 17 each) according to the retreatment system used: Group I. ProTaper Universal Retreatment (PTR) system + ProTaper Next system up to PTN X2; Group II. Waveone Gold (WOG) system (WOG25); Group III. Reciproc Blue (RB) system (RB25). The ability to regain apical patency, the volume of residual filling material, and dentinal microcrack were assessed using micro-CT imaging. Data were analyzed statistically using two-way analysis of variance and chi-square test with a significance level of 5%. Results There were no significant differences among the systems tested in the reestablishment of apical patency and reduction of filling materials (P > 0.05), but RB system exhibited better reestablishment root canal ability in the upper portion of curvature and the reduction of filling materials in the apical third (P < 0.05). Intergroup analysis indicated that PTR system induced significantly more dentinal microcracks than other two systems (P < 0.05). Conclusions All three tested Ni-Ti instruments showed the similar retreatability of curved root canals obturated with gutta-percha and iRoot SP. RB system may be more effective and safer in curved root canal retreatment.

scholarly journals Comparison of the efficacy of laser-activated and ultrasonic-activated techniques for the removal of tricalcium silicate-based sealers and gutta-percha in root canal retreatment: a microtomography and scanning electron microscopy study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ruiqi Yang ◽  
Yuqing Han ◽  
Zhaohui Liu ◽  
Zhezhen Xu ◽  
Hongyan Liu ◽  
...  
Keyword(s):  
Root Canal ◽  
Microscopy Study ◽  
Tricalcium Silicate ◽  
Electron Microscopy Study ◽  
Root Canal Filling ◽  
Filling Materials ◽  
Gutta Percha ◽  
Root Canal Retreatment ◽  
Ultrasonic Irrigation

Abstract Background Tricalcium silicate-based sealers have been usually indicated for the single-cone technique and result in more residual filling materials in root canal retreatment. Passive ultrasonic irrigation and photon-initiated photoacoustic streaming have been reported to improve the removal efficacy of root canal filling materials. However, the abilities of both techniques combined with NiTi re-instrumentation to remove residual tricalcium silicate-based sealer and gutta-percha have not been compared. The aim of this study was to evaluate the efficacy of laser-activated and ultrasonic-activated techniques in vitro for the removal of the tricalcium silicate-based sealer iRoot SP and gutta-percha after standard canal retreatment procedures with the use of nickel-titanium (NiTi) rotary instruments.

scholarly journals Influence of reuse and cervical preflaring on the fracture strength of reciprocating instruments

2017 ◽  
Vol 11 (01) ◽  
pp. 041-047 ◽  
Author(s):  
Claudio Maniglia-Ferreira ◽  
Fabio de Almeida Gomes ◽  
Tatyana Ximenes ◽  
Murilo Alves Teixeira Neto ◽  
Thiane Elys Arruda ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Root Canal ◽  
Nickel Titanium ◽  
Sem Images ◽  
Human Teeth ◽  
Plastic Deformations ◽  
Surface Cracking ◽  
Reciprocating Instruments ◽  
Niti Instruments ◽  
Root Canal Instrumentation

ABSTRACT Objective: This study sought to assess the influence of cervical preflaring and reuse after resterilization, on fracture strength and plastic deformation and/or surface cracking in reciprocating nickel–titanium [NiTi] endodontic instruments after root canal instrumentation of extracted human teeth. Materials and Methods: Forty engine-driven reciprocating NiTi instruments (20 Reciproc® [RC], VDW; 20 WaveOne® [WO], Dentsply) were used in root canal instrumentation of extracted human molars. A total of 485 human upper molars with similar anatomical features were selected and randomly distributed across four groups according to the instrumentation procedures performed (G1 and G3: RC; G2 and G4: WO). Reciprocating instruments were used as per manufacturer instructions. In groups G3 and G4, cervical preflaring was performed prior to instrumentation. After each use of each instrument, sterilization was repeated and scanning electron microscope (SEM) images were obtained to check for plastic deformations and/or cracks on instrument surfaces. Each instrument was used repeatedly until fracture occurred. Results: Regardless of flaring, RC files exhibited greater fracture strength than WO instruments (P<0.01) with and without preflaring. Cervical preflaring significantly reduced the risk of instrument fracture (P<0.01). No plastic deformations were observed before fracturing. However, cracks were found on WO instruments shortly after their first use. RC and WO instruments resisted fracturing after autoclave sterilization. Conclusions: Cervical preflaring allowed a significant increase in the number of times RC and WO files could be reused safely.

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