In Vitro Evaluation of the Effectiveness of ProTaper Universal Rotary Retreatment System for Gutta-Percha Removal with or without a Solvent

Takahashi, Cristiane Midori; Cunha, Rodrigo Sanches; Martin, Alexandre Sigrist De; Fontana, Carlos Eduardo; Silveira, Cláudia F. M.; Bueno, Carlos Eduardo da Silveira

doi:10.1016/j.joen.2009.07.015

Cited by 147 publications

(190 citation statements)

References 34 publications

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“…Other reports have also shown similarity between these retreatment techniques (TAKAHASHI et al, 2009;RÖDIG et al, 2012), confirming our results. On the other hand, some investigations revealed superior performance of the rotary system tested in this study for retreatment procedures as compared to manual files (GIULINI, COCHETTI; PAGAVINO, 2008;GU et al, 2008).…”

Section: Discussionsupporting

confidence: 93%

“…Different techniques have been used to remove filling material in endodontic retreatments, including the use of manual files BLUHM, 2004), heated instruments (ZMENER, PAMEIJER;BANEGAS, 2006), ultrasonic devices (PIRANI et al, 2009), rotary files (IMURA et al, 2000;HAMMAD, QUALTROUGH, SILIKAS, 2008;RÖDIG et al, 2012), reciprocating files (SILVA et al, 2015;CROZETA et al, 2016), adaptive motion systems (CROZETA et al, 2016), and specific systems developed for retreatment (GU et al, 2008;TAKAHASHI et al, 2009). Several studies used distinct methods such as bidimensional radiographic analysis or destructive approaches sectioning specimens to evaluate the remaining filling after endodontic retreatment (BARRIESHI-NUSAR, 2002;CUNHA et al, 2007;BARLETTA et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Micro-computed tomographic evaluation of removal and extrusion of root filling material during canal retreatment

Azevedo¹,

Pereira²,

Oliveira³

et al. 2016

Biosci. J.

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ABSTRACT:This study aimed to assess the efficiency of manual and rotary techniques for removing root filling material in endodontic treated canals and to evaluate the extrusion of debris via apical foramen. After access preparation, thirty human lower central incisors were instrumented, filled and divided into two groups (n=15): MNmanual retreatment technique; RT-rotary retreatment technique. The teeth were submitted to micro-computed tomographic scanning before and after the retreatment procedure, for quantifying the remaining filling material by relating the initial and final conditions. The analysis was conducted separately in all root thirds. The volume of material extruded through the apical foramen was also quantified. The data were statistically analyzed using t-test and two-way analysis of variance (ANOVA) at 5% of significance. No significant differences were detected between remaining filling material for the techniques evaluated (p=0.74), even considering the apical third only (p>0.75). Significant differences were found for the remaining filling material verified between the cervical third and middle/apical thirds, with lower values being observed at the cervical third for both groups (p<0.05). Apical extrusion of filling material was verified in seven specimens (2 from MN group and 5 from RT group). Both techniques showed similar performance for removing filling material from the root canal, considering the whole tooth or the root thirds independently. The apical extrusion of filling material observed was not sufficient to indicate which technique has increased tendency to induce more events during retreatments.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Micro-computed tomographic evaluation of removal and extrusion of root filling material during canal retreatment

Azevedo¹,

Pereira²,

Oliveira³

et al. 2016

Biosci. J.

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“…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). Considering these ideas and the aim to assess the performance of instruments by itself, no solvents were used herein.…”

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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“…This method has been reported as effective in determining the amount of filling residue, and in minimizing the subjectivity involved in a scale-based scoring method 8 . In addition, this method is more reliable than evaluation by radiography, because radiographic analysis provides only a 2-dimensional view, and has proven less effective than the cleavage method 7 . Recently, micro-computed tomography (micro-CT) has been used to evaluate the efficacy of different retreatment techniques 24 .…”

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%

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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In Vitro Evaluation of the Effectiveness of ProTaper Universal Rotary Retreatment System for Gutta-Percha Removal with or without a Solvent

Cited by 147 publications

References 34 publications

Micro-computed tomographic evaluation of removal and extrusion of root filling material during canal retreatment

Micro-computed tomographic evaluation of removal and extrusion of root filling material during canal retreatment

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

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