The Influence of Separated Instruments Metallurgy on the Incidence of Dentinal Cracks following Retrieval (In Vitro Study) | ||
| Advanced Dental Journal | ||
| Volume 6, Issue 2, April 2024, Pages 281-288 PDF (628.09 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjc.2023.193838.1265 | ||
| Authors | ||
| Omnia Abdel Hakim* ; Nihal Ezzat Sabet; Heba Ahmed Elasfouri | ||
| Department of Endodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt | ||
| Abstract | ||
| Ultrasonic retrieval of separated instruments was proven to be a highly successful procedure. However, its effects on root dentin are of major concern. Aim: To assess the influence of separated instruments alloy type on dentinal cracks development following ultrasonic retrieval in the presence of different intracanal lubricants. Methods: M-wire ProTaper Next files with tip size #25 and taper 0.6 (n=20), and EDM Neoniti files having the same size and taper (n=20) were fractured at 4mm from their tips in forty double-rooted moderately-curved upper premolars. A modified ultrasonic tip was used for their retrieval in presence of 17% EDTA solution or olive oil. Successfully retrieved samples had their roots horizontally sectioned, at 4mm and 6mm from the apex. Sections was examined under the SEM with different magnifications (60-300x) for cracks detection. Results: The majority of samples showed the development of dentinal cracks, with an incidence of 70% and 90% in ProTaper Next and Neoniti groups respectively in presence of EDTA, as opposed to 70% in Protaper Next and 80% in Neoniti in presence of olive oil, and with no statistically significant difference between the different alloys or intracanal. Conclusion: Separated instruments of different metallurgy show no effect on the incidence of dentinal cracks following ultrasonic retrieval. Lubricants of different viscosities fail to omit the development of cracks. | ||
| Keywords | ||
| Separated instruments; ultrasonic tip; ultrasonic retrieval; cracks | ||
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