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Factors affecting the cutting ability of sonic files
P J Lumley1, E Harrington, E Aspinwall
1School of Dentistry and School of Manufacturing and Mechanical Engineering, University of Birmingham, UK.
International Endodontic Journal
|May 1, 1996
Summary
This study found that applying more load and power significantly increases sonic file cutting ability. Optimal technique involves pressing the file and moving it slowly for maximum efficiency.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Sonic instruments are widely used in endodontic procedures.
- Understanding factors influencing their cutting efficiency is crucial for effective treatment.
Purpose of the Study:
- To investigate the cutting ability of sonic files (Heliosonic and Shaper) under various operational parameters.
- To determine the influence of file type, length, power, stroke length, stroke rate, and load on cutting performance.
Main Methods:
- A 2(6) full-factorial experimental design with two replications was employed.
- Cutting ability was assessed using a model system with bovine bone sections and size 25 sonic files.
- Variables evaluated included file type, length, power, stroke length, stroke rate, and load.
Main Results:
- Load, power, file type, stroke length, and stroke rate significantly affected cutting ability (ANOVA, P < 0.001).
- Load was the most influential variable, followed by power and file type.
- A significant interaction between stroke rate and stroke length was observed, impacting cutting differently based on stroke length.
Conclusions:
- Operator technique, specifically pressing the file against the canal wall and moving it slowly, is recommended to maximize cutting efficiency.
- The interplay between stroke rate and length is critical and requires careful consideration during use.