Comparative Evaluation of Flexural Properties and Clinical Flexibility Between Two Types of Nickel Titanium Endodontic Files

Abstract

ABSTRACT

Objective:
To analyse the flexibility of  two different generation of rotary endodontic file system by comparing second generation & fifth generation nickel-titanium rotary endodontic files at 5mm from the tip of the file in terms of mean (N/mm²).

Study design/ setting:

This research was performed in the department of Operative Dentistry, Hamdard University Dental Hospital, Karachi & at PCSIR Laboratory, Karachi.

Methodology:

This cross sectional study was performed in the department of Operative Dentistry HUDH & at PCSIR Laboratory, Karachi. First generation rotary endodontic file selected for this purpose was Protaper, Dentsply ^TM files while fifth generation rotary endodontic file selected for this purpose was KometSky^TM. Nickel Titanium rotary Endodontic files were loaded on a load testing cell & two-point bending test was performed. The files were measured at 5mm from the tip using a digital caliper (Mitutoyo, Japan) and marked with a rubber stopper.   Each file was secured between two metal plates on a load-sensing cell. A universal testing machine (Instron, 5KN model 4301, Norwood, MA) was used to bend the files to a maximum deflection of 4.5mm at a rate of 2mm/minute at room temperature (22^oC +/- 1^oC).

Results:

 Fifth-generation file is more flexible (p=0.0001) compared to second generation file with test value 2.89 with 95 Confidence interval. Mean value of 3.7092 was recorded for Fifth generation rotary files & 2.846 for second generation rotary endodontic files.

Conclusion:

Mean value of the fifth generation endodontic files was highly significant i.e p=0.0001 compared to second generation endodontic files