DOI: 10.4103/sej.sej_270_25 ISSN: 2278-9618

Fracture resistance of endodontically treated single-rooted teeth following instrumentation with different rotary file systems: An in vitro study

Nezar Boreak
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Abstract

Introduction:

Endodontic treatment often compromises the structural integrity of teeth, making them more susceptible to fracture. Rotary file systems differ in their design and properties, potentially influencing the extent of dentin preservation and resulting fracture resistance. The aim of this study was to evaluate and compare the fracture resistance of endodontically treated mandibular premolars instrumented with 3 rotary file systems.

Materials and Methods:

Sixty extracted single-rooted human mandibular premolars with similar anatomical features were selected and divided into four groups ( n = 15 per group): Group A – Control (no instrumentation), Group B – HyFlex CM, Group C – K3XF, and Group D – ProTaper Gold. All experimental groups were instrumented (0.06/#25 taper) according to manufacturer instructions, followed by obturation and core build-up. The samples were sent to the laboratory for single load fracture testing. Data were statistically analyzed using one-way analysis of variance and Dunnett’s post hoc test.

Results:

The highest mean fracture resistance was observed in the control group (1165.90 ± 178.70 N), followed by HyFlex CM (920.90 ± 365.88 N), ProTaper Gold (664.60 ± 241.22 N), and K3XF (387.40 ± 140.21 N). The differences among the groups were statistically significant ( P < 0.01).

Conclusion:

Among the rotary systems evaluated, HyFlex CM demonstrated the highest ability to preserve root integrity, whereas K3XF exhibited the lowest resistance to fracture. These results indicate that the use of flexible and conservative instrumentation systems can help in maintaining the structural durability of endodontically treated teeth.

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