Application of Endodontic Files for the Extraction of Root Tips: A Biomechanical Investigation and Case Study

Publication date: December 2016
Source:Journal of Oral and Maxillofacial Surgery, Volume 74, Issue 12
Author(s): Junliang Chen, Yun He, Qin Pan, Minhai Nie
PurposeTo investigate the appropriate endodontic file for the extraction of root tips through a biomechanical study and to evaluate the clinic efficiency of this technique.Materials and MethodsNine hundred molar roots were randomly divided into 3 groups (3, 5, and 7 mm) and amputated to the corresponding length. Different files were inserted into the root tips, and a pullout test was conducted using a universal testing machine. The pullout force was recorded and files with greatest pullout force were selected for clinical study. Patients' root tips were extracted using these files. The duration and incidence of postoperative complications were recorded.ResultsThe greatest pullout force was obtained for the 25^# Hedström file, regardless of the length of the root tip and the type of file. The pullout force of Hedström files was significantly greater than that of Kerr files in each file group and root length group (P < .05). Clinically, the direct success ratio of this technique was 81.4%. The incidence of postoperative complications was very low.ConclusionThe results of this study suggest that the application of endodontic files for the extraction of root tips is an acceptable technique. The 25^# Hedström file is the optimum choice for root extraction in most cases when using endodontic files.



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