Efficacy of ProTaper Universal Retreatment Files in Removing Filling Materials during Root Canal Retreatment

Giuliani, Valentina; Cocchetti, Roberto; Pagavino, Gabriella

doi:10.1016/j.joen.2008.08.002

Cited by 131 publications

(174 citation statements)

References 28 publications

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“…The use of a solvent has been suggested to reduce the sealer microhardness, facilitating NiTi instrument insertion into filling material (31), shortening the retreatment time (32). Although the use of solvent is recommended (33), the chemically softened gutta-percha can be forced into root canal walls and into its complex anatomy that is not touched by the instruments, increasing the challenges for filling removal and possibly increasing the instrumentation time (34,35).…”

Section: Discussionmentioning

confidence: 99%

Apically extruded debris in filling removal of curved canals using 3 NiTi systems and hand files

Delai¹,

Boijink²,

Hoppe³

et al. 2018

Braz. Dent. J.

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The aim of this study was to assess the amount of apically extruded debris during filling removal with WaveOne Gold (WOG), ProTaper Universal Retreatment (PTR), D-RaCe Retreatment (DRR) or hand files (HF), to compare the working time during filling removal, and to describe failures of NiTi instruments. Forty mesiobuccal roots of maxillary first molars were prepared with WOG Primary, obturated and divided into 4 groups (n=10), according to the instruments used: WOG, PTR, DRR or HF. Distilled water was used as irrigant and the extruded debris were collected in Eppendorf tubes and dried. The amount of extruded debris was determined by subtracting the final from the initial weight. The time of filling removal for each canal was recorded and the instruments used were analyzed pre and post-operatively by SEM. Kruskal-Wallis and Dunn's test analyzed extruded debris data and ANOVA, followed by Tukey's test, compared the working time data (α=0.05). Instrument deformation and fracture were described. WOG produced significantly less debris compared with HF and DRR (p<0.05), and similar to PTR (p>0.05). HF, PTR and DRR showed no significant difference (p>0.05). Working time in HF group was significantly higher than others (p<0.05). SEM analyses showed, from the 18 instruments evaluated, 3 fractures and 10 deformations. All instruments tested caused debris extrusion. WOG was associated with less extrusion than DRR and HF. Filling removal with HF was slower than with the other instruments. All NiTi systems presented fracture and deformation.

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Section: Discussionmentioning

confidence: 99%

Apically extruded debris in filling removal of curved canals using 3 NiTi systems and hand files

Delai¹,

Boijink²,

Hoppe³

et al. 2018

Braz. Dent. J.

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“…Several techniques have been proposed for removing root filling material, but none have shown the ability to remove gutta-percha and sealer completely from canal walls 8,9,11 . The removal of gutta-percha by using hand instruments is a slow and difficult process, especially when the filling material is well compacted.…”

Section: Discussionmentioning

confidence: 99%

“…The removal of gutta-percha by using hand instruments is a slow and difficult process, especially when the filling material is well compacted. Thus, Ni-Ti rotary instruments are recommended for reducing clinical time and facilitate removal 9,11 . However, in this study, we observed that even after using Ni-Ti rotary instruments specifically developed for retreatment, the filling material was not completely removed from the root canal walls, corroborating the findings of other studies 7,9-11 .…”

Section: Discussionmentioning

confidence: 99%

“…Different methodologies have been used to evaluate the amount of filling material remaining after retreatment 5,9 . In the present study, the specimens were longitudinally split, and the percentage of residual filling was calculated from images obtained under stereomicroscopy.…”

Section: Discussionmentioning

confidence: 99%

“…Several techniques have been used to remove sealer and gutta-percha, including heat-bearing instruments, stainless steel hand files, nickel-titanium (Ni-Ti) rotary instruments and ultrasonic tips, with or without the combined use of solvents [5][6][7][8] . Nevertheless, studies have shown that none of these retreatment procedures can completely clean the root canal walls [9][10][11] , particularly in the apical third 12 .…”

Section: Introductionmentioning

confidence: 99%

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Efficacy of passive ultrasonic irrigation in removing root filling material during endodontic retreatment

Michelon

Frighetto

Lang

et al. 2016

Rev. odontol. UNESP

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ResumoIntrodução: O retratamento endodôntico requer a remoção de todos os materiais obturadores para a limpeza, o preparo e a obturação subsequentes do canal radicular. Objetivo: Avaliar a eficácia da Irrigação Ultrassônica Passiva (IUP) na remoção de material obturador residual após a desobturação com sistema rotatório de níquel-titânio. Material e método: Dezoito raízes mesiais de molar inferior com istmos foram preparadas e obturadas. A obturação foi removida com o sistema rotatório ProTaper Retratamento e limas manuais tipo K. Os espécimes foram randomizados em dois grupos (n = 9), ambos irrigados com NaOCl a 2,5% e EDTA a 17%. No grupo Convencional, a seringa de irrigação foi utilizada. No grupo da IUP, a técnica da IUP foi usada. As raízes foram seccionadas longitudinalmente e avaliadas em estereomicroscópio. O teste t de Student foi usado para comparar os grupos e o modelo linear geral foi usado para comparar os terços cervical, médio e apical dentro de cada grupo, no que diz respeito a porcentagem de material obturador residual. Resultado: Não houve diferença estatisticamente significante entre os grupos, independentemente do terço do canal radicular analisado (P > 0.05). No grupo da IUP, o terço apical mostrou uma porcentagem significativamente mais alta de material obturador residual quando comparado aos terços cervical (P = 0.038) e médio (P = 0.029). Conclusão: A IUP não foi mais eficaz do que a técnica convencional na remoção de material obturador remanescente durante o retratamento endodôntico em canais radiculares com anatomia complexa.Descritores: Irrigação; retratamento; canal radicular; ultrassom. AbstractIntroduction: The aim of endodontic retreatment is to remove the previous root filling materials completely to allow for the subsequent steps of cleaning, canal shaping and filling replacement. Objective: To evaluate the efficacy of passive ultrasonic irrigation (PUI) in the removal of residual root filling material after removing the bulk of the root filling with nickel-titanium rotary instruments. Material and method: Eighteen mesial isthmus-containing roots of human mandibular molars were prepared and filled. The root canal filling was removed with the ProTaper Retreatment system and K-files. The specimens were randomized into 2 groups (n = 9), both irrigated with 2.5% NaOCl and 17% EDTA. In the conventional group, an irrigation syringe was used. In the PUI group, the PUI technique was used. The roots were sectioned longitudinally and evaluated under stereomicroscopy. Student's t test was used to compare groups and the general linear model was used to compare the apical, cervical, and middle root thirds within each group, in regard to the percentages of remaining residual filling material. Result: There was no statistically significant intergroup difference, irrespective of which root third was evaluated (P > 0.05). In the PUI group, the apical third showed a significantly higher percentage of residual filling material, in comparison with the cervical (P = 0.038) and middle (P = 0.029) thir...

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Clinical microscopic analysis of protaper retreatment system efficacy considering root canal thirds using three endodontic sealers

Só

Figueiredo

Fachin

et al. 2012

Microscopy Res & Technique

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To evaluate the efficacy of ProTaper Universal rotary retreatment system and the influence of sealer type on the presence of filling debris in the reinstrumented canals viewed in an operative clinical microscope. Forty-five palatal root canals of first molars were filled with gutta-percha and one of the following sealers: G1, EndoFill; G2, AH Plus; G3, Sealapex. The canals were then reinstrumented with ProTaper Universal rotary system. Roots were longitudinally sectioned and examined under an operative clinical microscope (10×), and the amount of filling debris on canal walls was analyzed using the AutoCAD 2004 software. A single operator used a specific software tool to outline the canal area and the filling debris area in each third (cervical, middle, and apical), as well as the total canal area. Data were analyzed by Kruskal-Wallis test and Tukey test at P < 0.05. Sealapex demonstrated significant differences in the average of filling debris area/canal among the 3 thirds. This group revealed that apical third showed more debris than the both cervical and middle third (P < 0.0001). Endofill presented significantly more filling debris than Sealapex in the cervical third (P < 0.05). In the middle (P = 0.12) and apical third (P = 0.10), there were no differences amongst groups. Debris was left in all canal thirds, regardless of the retreatment technique. The greatest differences between techniques and sealers were found in the cervical third.

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Efficacy of ProTaper Universal Retreatment Files in Removing Filling Materials during Root Canal Retreatment

Cited by 131 publications

References 28 publications

Apically extruded debris in filling removal of curved canals using 3 NiTi systems and hand files

Apically extruded debris in filling removal of curved canals using 3 NiTi systems and hand files

Efficacy of passive ultrasonic irrigation in removing root filling material during endodontic retreatment

Clinical microscopic analysis of protaper retreatment system efficacy considering root canal thirds using three endodontic sealers

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