Micro-computed tomography evaluation of dentinal microcracks following canal preparation with thermomechanically heat-treated engine-driven files
| Autor: | Safura Anita Baharin, Andanastuti Muchtar, Hsu Zenn Yew, Jasmina Qamaruz Zaman, Sharmini Arumugam, Shalini Kanagasingam |
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| Rok vydání: | 2021 |
| Předmět: |
Orthodontics
X-ray microtomography Materials science Hot Temperature Micro computed tomography Root canal 0206 medical engineering 030206 dentistry 02 engineering and technology X-Ray Microtomography A400 020601 biomedical engineering 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure stomatognathic system Nickel titanium Dentin medicine Heat treated Tomography General Dentistry |
| Zdroj: | Australian endodontic journal : the journal of the Australian Society of Endodontology Inc. 47(3) |
| ISSN: | 1747-4477 1329-1947 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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