ArticleJournal of conservative dentistry and endodontics2025
A comparative evaluation of the resistance to vertical root fracture after removal of separated instruments using three instrument retrieval systems: An
Article in Journal of conservative dentistry and endodontics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Efficiency of ultrasonic retrieval for separated instruments within the middle third of root canals using modified staging platform: a comparative in-vitro study.BMC oral health · 2026Article
- Expecting the unexpected: Identification and nonsurgical endodontic management of foreign body inside the root canal space postdental trauma.Journal of conservative dentistry and endodontics · 2025Article
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5 authors.
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Abstract
Introduction: Separated instruments have been retrieved from root canals using different systems of instruments. However, it has been a common observation that usage of available retrieval systems may weaken the roots of teeth making them prone to fracture and subsequent failure of the treatment as a whole. Hence, the following study was conducted to evaluate and compare the resistance to vertical root fracture after retrieval of separated instruments from the root canal using Ultrasonic U Files, Ultrasonic Tip (Acteon Endo Success ET25 Retreatment Tip), or the Endo Rescue System under magnification of the dental operating microscope. Materials and Methods: Forty-two moderately curved mesiobuccal roots of extracted decoronated mandibular first molar teeth were hemisectioned to standardize them to a length of 15 mm each. Following biomechanical preparation, 4-mm length ProTaper gold rotary finishing files F2 were intentionally separated in the middle third of the mesiobuccal root canal and verified radiographically. The samples were then randomly divided into three groups, and retrieval of the separated instrument was performed using the Ultrasonic U files, Ultrasonic ET25 Retreatment tip, or Endo Rescue System, respectively. After retrieval of the separated instruments, the samples were subjected to testing for vertical root fracture resistance using a universal testing machine with an accuracy of ± 1%. The data collected from all the samples were then subjected to statistical analysis. Result: Ultrasonic U files (Group A) showed the highest vertical root fracture resistance, with a statistically significant difference from the samples treated with ET 25 Ultrasonic retreatment tips(Group B). No significant differences were observed between Group A and C or Group B and Endo Rescue System (Group C) ( Summary and Conclusion: It was observed that Ultrasonic U files offer the least reduction in the vertical root fracture resistance after removal of separated instruments followed by the Endo Rescue system and then the ultrasonic ET25 retreatment tips. While no single instrument retrieval system is universally suitable for all situations due to various factors such as root anatomy, instrument type, location, size, pulpal status, and operator skill, clinicians should determine the treatment protocol by carefully considering the tooth's future prognosis.
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