A dental implant-based registration method for measuring mandibular kinematics using cone beam computed...

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Biomechanics

Background:

• Accurate measurement of three-dimensional (3D) kinematics of the mandible and dental implants is crucial for understanding biomechanical behavior and optimizing treatment outcomes.
• Existing methods may have limitations in precision or require complex setups.
• Dental cone beam computed tomography (CBCT) offers detailed anatomical imaging, but integrating dynamic motion analysis presents challenges.

Purpose of the Study:

• To develop and experimentally evaluate an innovative implant-based registration method for precise 3D kinematic measurements of the mandible and associated dental implants.
• To leverage CBCT imaging, enhanced with fluoroscopic capabilities, for this dynamic motion analysis.
• To assess the accuracy and reliability of the developed method under various experimental conditions.

Main Methods:

• The study utilized an implant-based registration approach, correlating CBCT scans of implants and bone with single-plane fluoroscopy images.
• The method's performance was experimentally validated using a cadaveric porcine head model.
• Seven distinct registration conditions, employing one to three implants, were assessed to determine their impact on measurement accuracy.

Main Results:

• The implant-based registration method demonstrated high accuracy, with measurement errors (SD) below 0.2 mm for in-plane translation, 2.2 mm for out-of-plane translation, and 1.3 degrees for angular components.
• Utilizing three implants significantly reduced measurement errors, achieving less than 0.1 mm for in-plane translation, 1.7 mm for out-of-plane translation, and 0.4 degrees for angular components.
• The method's accuracy was consistent regardless of the number of implants used, highlighting its robustness.

Conclusions:

• A novel implant-based registration method has been successfully developed for measuring the 3D kinematics of the mandible and dental implants.
• The method exhibits high accuracy and reliability, making it a valuable tool for analyzing bone and implant motion.
• This technique holds significant potential for various research and clinical applications requiring precise dynamic assessment of craniofacial structures.