Cyclic Fatigue Comparison of TruNatomy, Twisted File, and ProTaper Next Rotary Systems.

Area of Science:

• Endodontics
• Dental Materials Science
• Biomaterials Engineering

Background:

• Endodontic files undergo cyclic fatigue during root canal preparation.
• Evaluating cyclic fatigue resistance is crucial for assessing instrument durability and clinical performance.
• The TruNatomy (TN) system is a novel endodontic file that requires performance evaluation.

Purpose of the Study:

• To evaluate the cyclic fatigue resistance of the new TruNatomy (TN) file.
• To compare the cyclic fatigue resistance of TN with established systems: ProTaper Next (PTN) and Twisted Files (TF).

Main Methods:

• Forty-five endodontic files (15 each of PTN X2, TF, and TN prime file) were subjected to cyclic fatigue testing.
• Testing was performed in artificial stainless-steel canals with a 60-degree curvature and 5 mm radius at 300 rpm.
• The number of cycles to failure (NCF) was recorded for each file, and data were analyzed using ANOVA and Tukey's test.

Main Results:

• The TruNatomy (TN) file exhibited a significantly higher mean NCF (846.67 ± 37.16) compared to Twisted Files (TF) (521.67 ± 63.07) and ProTaper Next (PTN) (259 ± 37.2).
• Statistical analysis confirmed TN's superior cyclic fatigue resistance (p < 0.05) against both TF and PTN.
• All tested files had a length of 25 mm, with specific sizes and tapers noted for each group.

Conclusions:

• The TruNatomy (TN) file demonstrates superior cyclic fatigue resistance compared to ProTaper Next (PTN) and Twisted Files (TF).
• The enhanced cyclic fatigue resistance of TN may offer clinical advantages, potentially related to its design and tooth structure preservation.
• Further research is warranted to assess other properties and clinical efficacy of the TruNatomy system.