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01-11-2016 | Original Article

A micro-computed tomography assessment of the efficacy of rotary and reciprocating techniques for filling material removal in root canal retreatment

Authors: Bruno Monguilhott Crozeta, Manoel Damião de Sousa-Neto, Graziela Bianchi Leoni, Jardel Francisco Mazzi-Chaves, Yara Terezinha Corrêa Silva-Sousa, Flares Baratto-Filho

Published in: Clinical Oral Investigations | Issue 8/2016

Abstract

Objectives

The aim of this study was to compare the efficacy of rotary and reciprocating techniques for removing filling material from root canals, using micro-computed tomography (micro-CT) imaging.

Materials and methods

The distal root canals of 42 human mandibular molars were instrumented with hand files up to size 40 according to a step-down technique and obturated with gutta-percha and an epoxy resin-based sealer using Tagger’s hybrid technique. Teeth were divided into six groups (n = 7) according to the instruments used for removal of filling material: group PTUR (Protaper Universal Retreatment), group W40 (WaveOne 40.08), group R40 (Reciproc 40.06), group R50 (Reciproc 50.05), group W25/W40 (WaveOne 25.08/40.08), and group R25/R40/R50 (Reciproc 25.08/40.06/50.05). Teeth were scanned with a micro-CT device before and after use of the instruments to calculate the percentage of remaining filling material. Data were compared using one-way ANOVA and Fisher’s LSD test at 5 % significance level.

Results

The mean percentage of remaining filling material was significantly lower when canals were retreated with the set of instruments R25/R40/R50 and single instruments W40 and R50 compared with the set of instruments W25/W40 (P < 0.05), which promoted material compaction in the apical region.

Conclusion

None of the retreatment techniques removed the root fillings completely. PTUR instruments performed equally effective regarding filling removal compared with W40, R40, R50, W25/W40, and R25/R40/R50. For WaveOne, the use of a single instrument (size 40, taper 0.08) was more effective in removing filling material, while for Reciproc showed similar cleaning ability using single instrument or combination of instruments.

Clinical relevance

The results of this in vitro study provide consistent information on filling material removal capacity of mechanized systems during retreatment at the different root canal thirds.

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Title: A micro-computed tomography assessment of the efficacy of rotary and reciprocating techniques for filling material removal in root canal retreatment
Authors: Bruno Monguilhott Crozeta
Manoel Damião de Sousa-Neto
Graziela Bianchi Leoni
Jardel Francisco Mazzi-Chaves
Yara Terezinha Corrêa Silva-Sousa
Flares Baratto-Filho
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 8/2016
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-016-1728-0

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Springer Medicine

A micro-computed tomography assessment of the efficacy of rotary and reciprocating techniques for filling material removal in root canal retreatment

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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