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Effects of Instrument Handle Design on Dental Hygienists' Forearm Muscle Activity During Scaling
Journal of Dental Hygiene : JDH
|November 10, 2017
Summary
The heaviest dental instrument handle (23g, 11.1mm) significantly increased forearm muscle activity during simulated scaling. Lighter handles (16-21g) showed similar muscle activity, with handle diameter influencing user preference more than weight.
Area of Science:
- Ergonomics in Dentistry
- Musculoskeletal Health
- Biomechanical Analysis
Background:
- Dental hygienists are at high risk for musculoskeletal disorders.
- Instrument handle design is a potential factor influencing muscle strain.
- Understanding the biomechanics of instrument use is crucial for prevention.
Purpose of the Study:
- To evaluate the impact of four distinct instrument handle designs on forearm muscle activity.
- To compare muscle activation during simulated dental scaling using varying weights and diameters.
Main Methods:
- Surface electromyography (sEMG) measured muscle activity in 27 dental hygienists.
- Participants scaled artificial calculus using a curet with four different handle designs.
- Four handle designs varied in weight (16-23g) and diameter (6.35-12.7mm).
Main Results:
- The heaviest instrument (23g, 11.1mm diameter) significantly increased muscle activity compared to others.
- Instruments weighing 16g, 18g, and 21g produced similar muscle activity levels.
- Handle diameter, not weight, was the primary factor influencing participant preference for comfort.
Conclusions:
- Instrument handle design directly affects forearm muscle activity in a simulated scaling task.
- Heavier, wider handles may increase biomechanical load, potentially impacting musculoskeletal risk.
- Further research is needed to correlate these findings with real-world clinical practice and injury prevention.
