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Micro‐computed tomography evaluation of dentinal microcracks following canal preparation with thermomechanically heat‐treated engine‐driven files
Author(s) -
Arumugam Sharmini,
Yew Hsu Zenn,
Baharin Safura Anita,
Zaman Jasmina,
Muchtar Andanastuti,
Kanagasingam Shalini
Publication year - 2021
Publication title -
australian endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.703
H-Index - 34
eISSN - 1747-4477
pISSN - 1329-1947
DOI - 10.1111/aej.12516
Subject(s) - materials science , dentin , nickel titanium , instrumentation (computer programming) , root canal , dentistry , dental instruments , dentinal tubule , orthodontics , composite material , medicine , shape memory alloy , computer science , operating system
This study aimed to evaluate and compare the frequency of microcracks and its severity at different root canal dentin locations, after preparation with thermomechanically heat‐treated engine‐driven nickel‐titanium instruments. Forty mandibular premolars were assigned to four experimental groups ( n = 10): ProTaper Next, ProTaper Gold, WaveOne Gold and Reciproc Blue. After pre‐instrumentation micro‐computed tomography scans, the root canals were prepared to size 25. Following post‐instrumentation scans, pre‐ and post‐instrumentation scanned images were analysed for the presence and extent of dentinal defects. A total of 56 500 cross‐sectional images were obtained, showing that less than 2.3% with pre‐existing dentinal microcracks. No new microcracks were identified during the post‐instrumentation analyses. No significant association was found between the types of dentinal defects, file motions and sequences. Thermomechanically heat‐treated rotary files did not induce the formation of new microcracks. There was also no association between the kinematic motions and sequences of the rotary instruments to the types of dentinal defects.