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Related Experiment Video

Updated: Feb 2, 2026

Oral Biofilm Formation on Different Materials for Dental Implants

Oral Biofilm Formation on Different Materials for Dental Implants

Published on: June 24, 2018

Development of a dental handpiece angle correction device.

Yoon Nam¹, Mi Young Eo², Soung Min Kim³

¹Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.

Biomedical Engineering Online

|November 28, 2018

Summary

A new angle correction device for dental drills significantly reduces tooth preparation convergence angles, improving accuracy in fixed prosthodontics. This innovation offers high precision comparable to surgical navigation systems.

Keywords:

Angulation correction device Convergence angle Gyro sensor Tooth axis deviation

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Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Published on: April 29, 2014

Area of Science:

Dental Technology
Prosthodontics
Biomedical Engineering

Background:

Achieving a uniform wall angle is critical for ideal convergence angles in fixed prosthodontics.
A novel detachable angle-correction apparatus for dental handpiece drills was developed to aid precise tooth preparation.

Purpose of the Study:

To develop and evaluate a novel angle-correction device for dental handpiece drills.
To assess the device's effectiveness in reducing convergence angles during tooth preparation.

Main Methods:

A gyro sensor, acceleration sensor, and Kalman filter algorithm were used to calculate object slope.
A matrix formulation converted handpiece body angulation to drill part angulation.
16 volunteers performed tooth preparation on resin teeth; prepared abutments were 3D scanned and analyzed using CAD software.

Main Results:

The device maintained a stable zero point with less than 1° deviation at various angles.
Without the apparatus, average bucco-lingual (BL) and mesio-distal (MD) convergence angles were 20.26° and 17.88°, respectively.
With the apparatus, average BL and MD convergence angles significantly reduced to 13.21° and 10.79°, respectively.

Conclusions:

The developed angle correction device provides high accuracy, comparable to commercial surgical navigation systems.
The device's compact size is significantly smaller than existing commercial navigation systems.
This apparatus is anticipated for widespread use in various orofacial surgery applications.