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Related Experiment Video

Updated: Jun 14, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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Published on: October 28, 2022

The self-adjusting file (SAF). Part 2: mechanical analysis.

Rafael Hof¹, Valery Perevalov, Moshe Eltanani

¹ReDent-Nova Inc, Ra'anana, Israel.

Journal of Endodontics

|March 24, 2010

Summary

The self-adjusting file (SAF) is an elastically compressible endodontic file that effectively removes dentin. It maintains efficacy with continuous irrigation and recommended use, showing minimal degradation.

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Area of Science:

Endodontics
Dental Materials Science
Biomaterials Engineering

Background:

The self-adjusting file (SAF) is a novel endodontic instrument designed for root canal preparation.
Continuous irrigation is crucial for effective root canal treatment, but its interaction with instruments requires investigation.

Purpose of the Study:

To evaluate the mechanical properties of the SAF, including compressibility, peripheral force, and abrasivity.
To assess the durability and degradation of the SAF under simulated clinical use.
To determine the potential for irrigant extrusion beyond the apex during SAF use.

Main Methods:

Compressibility and peripheral force were measured using specialized apparatus.
Dentin removal efficacy was assessed on dentin blocks.
Functional fatigue-to-failure assays evaluated file durability.
Degradation was analyzed by comparing efficacy of used versus new files.
Irrigant extrusion was studied in simulated root canals with open apices.

Main Results:

The SAF exhibits elastic compressibility, adapting to canal anatomy and exerting even force.
Combined file motion and abrasivity facilitate effective hard-tissue removal.
No mechanical failure occurred within 29 minutes of operation.
File efficacy reduced by 40% after 30 minutes of use.
Continuous irrigation with SAF did not cause irrigant extrusion beyond the apex.

Conclusions:

The SAF is an elastically compressible instrument capable of efficient dentin removal.
The SAF demonstrates mechanical durability for its recommended operational duration.
Minimal loss of efficacy occurs with appropriate use, making it suitable for root canal preparation with continuous irrigation.