Efficacy of two Ni‐Ti systems and hand files for removing gutta‐percha from root canals

Mollo, Aniello; Botti, Giovanni; Goldoni, N. Prinicipi; Randellini, E.; Paragliola, Raffaele; Chazine, Michelle; Ounsi, Hani F.; Grandini, Simone

doi:10.1111/j.1365-2591.2011.01932.x

Cited by 89 publications

(108 citation statements)

References 21 publications

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“…This fact is probably responsible for the several controversies existing among different studies, since root canal anatomy can influence the amount of remaining filling material after retreatment, irrespective of the technique used (BARRIESHI-NUSAR, 2002; GIULINI, COCHETTI; PAGAVINO, 2008;HAMMAD, QUALTROUGH, SILIKAS, 2008). Despite this, some investigations also showed that both retreatment techniques evaluated in this study are incapable to completely remove filling material from root canal walls (ZMENER, PAMEIJER;BANEGAS, 2006;HAMMAD, QUALTROUGH, SILIKAS, 2008;BARLETTA et al, 2008;SOMMA et al, 2008;PIRANI et al, 2009;MOLLO et al, 2012), corroborating our findings.…”

Section: Discussionsupporting

confidence: 75%

“…Several studies on extrusion of root filling used methods in which the extruded material was freely released, without any barrier to block debris (IMURA et al, 2000;HUANG et al, 2007;SOMMA et al, 2008;MOLLO et al, 2012). This fact does not correspond to the clinical reality, because periodontal structures prevent larger amounts of debris to reach the apical region 1115 Micro-computed tomographic… AZEVEDO, K. C. M. et al (SELTZER et al, 1968).…”

Section: Discussionmentioning

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: 75%

Section: Discussionmentioning

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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“…Irregularities, isthmuses and recesses 4 hamper filling material removal, cleaning and preparation of the root canal, by providing a refuge for microorganisms 3 , and thus compromising the success of endodontic retreatment. In the present study, the selection of curved mesial roots of mandibular molars with isthmuses may explain the large amount of remaining filling material, as compared with other studies in the literature 10 . Most remaining filling material was found in the isthmus, in canal wall irregularities and in the apical third.…”

Section: Discussionmentioning

confidence: 71%

“…Most experimental studies comparing the efficacy of different techniques for retreatment were conducted using single straight root canals 5,8,10,11 , to simplify the standardization of specimens. Although teeth with complex anatomy represent a common clinical situation 23 , investigations of non-surgical retreatment techniques for teeth with 2 curved canals and an isthmus are rare.…”

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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Evaluation of surface alterations in different retreatment nickel‐titanium files: AFM and SEM study

Sağlam

Görgül

2015

Microscopy Res & Technique

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The aim of this study was to evaluate the surface changes of nickel titanium (Ni-Ti) rotary retreatment files after three and five uses. Furthermore, the effects of 2% sodium hypochlorite and chloroform solutions and sterilization procedures on the NiTi rotary retreatment surfaces were investigated. ProTaper Retreatment files, R-endo files, and Mtwo retreatment files were used for this study. The palatinal roots of maxillary molar teeth were obturated with gutta percha and Ah26. Retreatment procedures were performed with these retreatment file systems. The surface changes of untreated NiTi rotary files that were used three and five times, immersed in NaOCl and chloroform and subjected to sterilization procedures were investigated with atomic force microscopy (AFM) and scanning electron microscopy (SEM). The RMS values, three dimensional images and SEM images at various magnifications were obtained. RMS values showed that all three NiTi rotary retreatment file systems showed significant deteriorations after three and five uses. Cracks, damages and spiral construction deteriorations were detected in the SEM images after three and five uses. Furthermore, the Mtwo 15 file was broken off after five uses. AFM data indicated that 2% NaOCl caused significant surface deteriorations on NiTi rotary files and both AFM and SEM evaluation showed that chloroform solution and sterilization procedures did not cause significant surface deteriorations. In conclusion, ProTaper retreatment, R-endo, and Mtwo retreatment files showed surface damages depending on retreatment procedures. Clinicians have to consider that retreatment files always have a tendency to break off after the third time they have been used.

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Efficacy of two Ni‐Ti systems and hand files for removing gutta‐percha from root canals

Abstract: The Ni-Ti systems were more effective and faster than hand files, although all techniques left gutta-percha and sealer remnants on the root canals.

Cited by 89 publications

References 21 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

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

Evaluation of surface alterations in different retreatment nickel‐titanium files: AFM and SEM study

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