Efficacy of Two Rotary NiTi Instruments in the Removal of Gutta-Percha During Root Canal Retreatment

Saad, A. Yousef; Al‐Hadlaq, Solaiman M.; Alkatheeri, Nasser

doi:10.1016/j.joen.2006.08.012

Cited by 156 publications

(240 citation statements)

References 33 publications

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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%

“…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%

“…The teeth were evaluated in the apical, middle and coronal thirds. 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 .…”

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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Among several treatment alternatives, non-surgical retreatment should be considered as the first choice (2). The main goal of retreatment is to regain access to the apical foramen by complete removal of the root canal filling material, thereby achieving sufficient cleaning and shaping of the root canal system and final proper obturation (3).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of rotary or manual techniques for removing a 6-year-old filling material

Duarte

Só

Cimadon³

et al. 2010

Braz. Dent. J.

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The aim of this study was to evaluate the effectiveness of manual and rotary instrumentation techniques for removing root fillings after different storage times. Twenty-four canals from palatal roots of human maxillary molars were instrumented and filled with gutta-percha and zinc-oxide eugenol-based sealer (Endofill) , and were stored in saline for 6 years. Non-aged control specimens were treated in the same manner and stored for 1 week. All canals were retreated using hand files or ProTaper Universal NiTi rotary system. Radiographs were taken to determine the amount of remaining material in the canals. The roots were vertically split, the halves were examined with a clinical microscope and the obtained images were digitized. The images were evaluated with AutoCAD software and the percentage of residual material was calculated. Data were analyzed with two-way ANOVA and Tukey's test at 5% significance level. There was no statistically significant differences (p>0.05) between the manual and rotary techniques for filling material removal regardless the ageing effect on endodontic sealers. When only the age of the filling material was analyzed microscopically, non-aged fillings that remained on the middle third of the canals presented a higher percentage of material remaining (p<0.05) compared to the aged sealers and to the other thirds of the roots. The apical third showed a higher percentage of residual filling material in both radiographic and microscopic analysis when compared to the other root thirds. In conclusion, all canals presented residual filling material after endodontic retreatment procedures. Microscopic analysis was more effective than radiographs for detection of residual filling material.

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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 Two Rotary NiTi Instruments in the Removal of Gutta-Percha During Root Canal Retreatment

Cited by 156 publications

References 33 publications

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

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

Effectiveness of rotary or manual techniques for removing a 6-year-old filling material

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

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