Accuracy of a manual torque application device for morse-taper implants: a technical note.

Area of Science:

• Dental Implantology
• Biomaterials Science
• Mechanical Engineering

Background:

• Accurate torque application is crucial for dental implant stability and long-term success.
• Manual torque devices are commonly used in implant dentistry, but their performance over time is not fully understood.

Purpose of the Study:

• To evaluate and compare the torque output of new versus used manual torque devices specifically designed for Morse taper implants.
• To determine if clinical usage affects the accuracy and consistency of torque delivery.

Main Methods:

• Fifteen ITI manual torque devices were categorized into three groups based on usage: new, moderately used (50-200 times), and heavily used (500-1,000 times).
• Torque measurements were performed using a custom wrench with strain gauges connected to a data acquisition system at 35 Ncm and 15 Ncm target settings.
• Torque data were collected at 10,000 Hz and converted to torque units for analysis.

Main Results:

• New manual torque devices delivered significantly higher torque compared to used devices at the 35 Ncm target (P < .05).
• Heavily used devices (500-1,000 uses) exhibited a torque output approximately 1.5 Ncm lower at 35 Ncm and 1 Ncm lower at 15 Ncm compared to newer devices.
• A slight but measurable decrease in torque output was observed with increased clinical use.

Conclusions:

• ITI manual torque devices demonstrate consistent performance but experience a slight reduction in torque output with cumulative clinical usage.
• Regular calibration or replacement of manual torque devices may be necessary to maintain optimal torque accuracy in clinical practice.