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Effect of air inlet ring opening on sonic handpiece performance
P J Lumley1, A D Walmsley, P M Marquis
1Unit of Conservative Dentistry, School of Dentistry, University of Birmingham, UK.
Journal of Dentistry
|December 1, 1994
Summary
The air inlet ring opening on sonic handpieces is crucial for file oscillation. Critical opening ensures efficient elliptical and longitudinal cutting actions, even under clinical load.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Dental Technology
Background:
- Sonic handpieces are widely used in dentistry.
- Understanding their oscillatory patterns is key to optimizing performance.
- The MM 1500 sonic handpiece's mechanism requires investigation.
Purpose of the Study:
- To investigate the impact of air inlet ring opening on the MM 1500 sonic handpiece's oscillatory pattern.
- To determine the effect of load on the handpiece and file movements.
- To analyze the relationship between air inlet ring opening and file oscillation efficiency.
Main Methods:
- Microscopic determination of the oscillatory pattern of the driver head and files.
- Testing in both air and under simulated clinical load conditions.
- Systematic variation of the air inlet ring opening.
Main Results:
- A critical air inlet ring opening is necessary for driver head and sonic file oscillation.
- Driver oscillation was elliptical, with displacement varying based on air inlet ring opening.
- Under load, the file's elliptical movement transformed into an efficient longitudinal cutting action.
Conclusions:
- Air inlet ring opening significantly influences sonic handpiece oscillation.
- A critical opening is required to initiate driver head oscillation.
- Clinical loading does not impede the efficient longitudinal cutting action of the sonic file.