Microtomographic Evaluation of Canal Centralization and Dentine Removal after Canal Preparation with Two Rotary Systems: HyFlex EDM and ProTaper Next

• Published in: European journal of dentistry 2022-07, Vol.16 (3), p.663-668
• Main Authors: Ronquete, Vivian, Martin, Alexandre Sigrist de, Zuim, Karin, Coutinho, Thais Machado de Carvalho, Marceliano, Eduardo Fagury Videira, Goulart, Paula Avelar Da Silva Ribeiro, Lopes, Ricardo Tadeu, Silveira Bueno, Carlos Eduardo Da, Marceliano-Alves, Marília Fagury Videira
• Format: Article
• Language: English
• Subjects: Original; Original Article
• ISSN: 1305-7456; 1305-7464
• DOI: 10.1055/s-0041-1739440

Abstract Objective  This study compared the ProTaper Next (PTN; Dentsply Sirona, Tulsa, Oklahoma, United States) and HyFlex EDM (HEDM; Coltene/Whaledent AG, Alstätten, Switzerland) systems using micro–computed tomography (CT). Materials and Methods  Twenty-one mesial roots classified as Vertucci's type IV from extracted mandibular first molars with curvatures between 20 and 40 degrees were selected. The teeth were scanned using a micro-CT before and after root canal preparation by both systems, applied to the same root, in alternating canals. The following parameters were analyzed: canal centering, apical transportation, root canal diameter/root diameter. Results  No statistically significant differences between both systems were observed for any of the assessed morphological parameters ( p  > 0.05). All canals presented diameter enlargement of more than 40% in relation to root diameter in the cervical and middle segments. No statistically significant difference was noted between the HEDM and PTN groups. The wear percentage for the HEDM group in the cervical and middle thirds were 49.66 ± 8.65 and 46.48 ± 14.29, respectively, and 51.02 ± 11.81 and 45.48 ± 10.79 for the PTN group, respectively. Conclusion  Both systems displayed similar mandibular molar mesial canals preparation, with no differences noted for any of the assessed parameters. Both groups showed increased canal diameter in the cervical and middle thirds by more than 40%.