Abstract
The endodontic file is a tapered, needle shape body used for the preparation of curved human root canals. During the preparation, process files get failed due to the locking action offered by the canal wall. The present study aimed to find the fatigue life of endodontic files at 23°, 33° and 43° root canal curvature angles. Four brands of files were selected for the present study viz. Hyplex CM, Pro-Taper Next, Hero Shaper, Pro-File Vortex. The strain life analysis done using ANSYS showed that the Hyplex CM file gives the highest fatigue life at 23°, 33° and 43° root canal curvature angles. Therefore, Hyplex CM file was selected for DoE Taguchi Optimization study. Each experimental reading was conducted on X Smart Plus experimental setup under purely rotary and combined reciprocating-rotary motion, at 500 rpm, 600 rpm and 700 rpm and 23°, 33° and 43° root canal curvature angles. Hyplex CM file given maximum fatigue life at 23° root canal curvature angle and 500 rpm speed of rotation. But if file motion is combined rotary-reciprocating, life reduces. The ANNOVA study showed that P-value and significance F are very small, which represented that the regression model is effective.
Highlights
The endodontic treatment aims to save the tooth which is infected, decayed or highly susceptible to future infection
The cleaning and shaping of the infected root canal are known as root canal preparation and filling and sealing of the prepared root canal using biocompatible material Gutta-percha is known as root canal obturation, both root canal preparation and obturation comes under endodontic treatment and is known as root canal treatment [2,3]
The study used finite element analysis and cyclic fatigue test for assessment of fatigue life of endodontic files during the root canal preparation process when placed in 23°, 33° and 43° root canal curvature angles and under purely rotary, combined reciprocating-rotary motions
Summary
The endodontic treatment aims to save the tooth which is infected, decayed or highly susceptible to future infection. Flutes help debris to come out from the infected root canal during the preparation process [4]. The endodontic file rotates in a curved root canal in presence of infected tissue, debris and oral fluids which offers locking pressure to the rotating file. The locking action of the canal on the endodontic file leads to fatigue failure [5]. This fatigue failure can be assessed using cyclic fatigue or torsion fatigue approach. These approaches help to find the life of the endodontic file. The life of the endodontic file helps the Dentist to make use of the file so that failure of the file in the patient jaw can be avoided during canal preparation
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