E-ISSN 2548-0839
Comparison of the Self-Adjusting File and Hedström File Used as Supplementary Instruments for the Remaining Filling Material Removal During Retreatment of C-Shaped Canals: A Micro-CT Study []
. 2020; 5(2): 112-117 | DOI: 10.14744/eej.2020.50570

Comparison of the Self-Adjusting File and Hedström File Used as Supplementary Instruments for the Remaining Filling Material Removal During Retreatment of C-Shaped Canals: A Micro-CT Study

Pablo Andrés Amoroso Silva1, Murilo Alcalde2, Rodrigo Vivan2, Marco Antonio Hungaro Duarte2
1Department of Restorative Dentistry, Londrina State University, Londrina, Paraná, Brazil
2Department of Endodontics, Faculdade de Odontologia de Bauru, São Paulo University, Bauru, São Paulo, Brazil

Objective: The aim of this study was to evaluate the use of Self-adjusting file (SAF) system and Hedström (H) file for removing remaining filling material (RFM) from C-shaped canals.
Methods: 20 C-shaped mandibular second molars with C1 configurations were instrumented, filled with tagger´s hybrid technique. Samples were divided into 2 groups (n=10). Reciproc R25 and a Mtwo 35/04 file were used for retreatment in both groups. Then, a 2.0 SAF file (group I) and a #35 H file (group II) were used as supplementary steps for RFM removal. Micro-CT scanning was performed after every procedure. Total volumes were calculated and converted into percentages. Also, the minimum wall thickness at 3, 5, 7 mm from apex was calculated. The Prism 7.0 software was used as the analytical tool with a significance of 5%.
Results: Initial obturation removal was approximately 64% in group I and 67% in Group II. The apical third had the highest values of RFM. The use of a H file significantly reduced the RFM compared to SAF in the total canal length respectively (30% vs 18%) and at 1-3 mm and 3-6 mm when compared to the use of SAF. A statistically significant decrease of RFM and minimum wall thickness were observed in both groups (P<0.05).
Conclusion: None of the retreatment techniques completely removed RFM. The apical region was the more unaffected area. Also, the SAF file was less effective than the H file in removing the RFM. Although C-shaped canals possesses thinner dentinal wall thickness, no excessive dentine removal was observed after each instrument use. (EEJ-2019-07-067)

Keywords: C-shaped canals, Hedström file, micro-CT, root canal retreatment, reciproc, self-adjusting file

Pablo Andrés Amoroso Silva, Murilo Alcalde, Rodrigo Vivan, Marco Antonio Hungaro Duarte. Comparison of the Self-Adjusting File and Hedström File Used as Supplementary Instruments for the Remaining Filling Material Removal During Retreatment of C-Shaped Canals: A Micro-CT Study. . 2020; 5(2): 112-117

Corresponding Author: Pablo Andrés Amoroso Silva
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