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Effect of viewing angles on measurement errors when using an implant cantilever beam torque-limiting device
Chandur P K Wadhwani1, Richard O'Brien2, Paul S Rosen3
1Private practice, Bellevue, Wash; Affiliate Assistant Professor, Department of Restorative Dentistry, University of Washington School of Dentistry, Seattle, Wash.
The Journal of Prosthetic Dentistry
|January 8, 2022
Summary
Operator viewing angle significantly impacts dental implant torque wrench accuracy. Maintain a perpendicular view to avoid measurement errors and ensure proper screw joint tightness, preventing premature implant failure.
Area of Science:
- Biomaterials Science
- Dental Engineering
- Metrology
Background:
- Parallax error in implant cantilever beam torque-limiting devices can lead to inaccurate torque readings.
- Over- or underreading torque values may cause premature failure of dental implant screw joints.
Purpose of the Study:
- To evaluate the impact of operator viewing angle on torque measurements using a cantilever beam device.
- To assess reading errors when the device is operated towards or away from the user.
Main Methods:
- An in vitro study utilized a beam torque wrench with a fixed cantilever beam at 32 Ncm.
- A digital camera recorded measurements at 10-degree increments from perpendicular viewing angles.
- Percentage measurement error was calculated and compared to ISO 6789-1:2017 standards.
Main Results:
- Measurement errors were greatest at lower torque values and increased with viewing angle deviation.
- Viewing away from the operator caused overreading, risking undertightening.
- Viewing towards the operator resulted in underreading.
Conclusions:
- Operators should maintain a near-perpendicular viewing angle to the cantilever beam to minimize parallax error.
- Avoid viewing angles greater than 10 degrees for torques below 15 Ncm.
- For torques between 25-35 Ncm, limit viewing angles to under 30 degrees to meet ISO standards.
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