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

Author(s)

Silva, Pablo Amoroso ^[1] ; Alcalde, Murilo Priori ^[2] ; Vivan, Rodrigo Ricci ^[2] ; Hungaro Duarte, Marco Antonio ^[2]

Affiliation

^[1] Univ Estadual Londrina, Dept Restorat Dent, Londrina, Parana - Brazil

^[2] Univ Sao Paulo, Fac Odontol Bauru, Dept Endodont, Bauru, SP - Brazil

• Document type: Journal article
• Source: EUROPEAN ENDODONTIC JOURNAL; v. 5, n. 2, p. 112-117, 2020.
• Web of Science Citations: 0

Abstract

Objective: The aim of this study was to evaluate the use of Self-adjusting file (SAF) system and Hedstrom (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. (AU)

• FAPESP's process: 14/03009-1 - Evaluation of the internal anatomy, instrumentation and retreatment techniques, using new mechanized instrumentation systems on permanent mandibulary second molars with fused roots
• Grantee: Pablo Andrés Amoroso Silva
• Support Opportunities: Scholarships in Brazil - Doctorate