[Validation of the technique of TMJ 3D analysis based on computer tomography]

Area of Science:

• Biomedical Engineering
• Radiology
• Orthodontics

Background:

• Accurate 3D analysis of temporomandibular joint (TMJ) parameters is essential for diagnosing and treating various conditions.
• Existing methods may be susceptible to human error, impacting diagnostic reliability.

Purpose of the Study:

• To optimize the technique for 3D analysis of TMJ parameters using computed tomography.
• To identify and mitigate sources of error in TMJ parameter measurements.

Main Methods:

• Utilized Avantis3D software for 3D analysis of TMJ parameters (articular gap width, condyle size, articular tubercle dimensions).
• Investigated the impact of manual contour corrections, measurement sector shifts, and longitudinal axis determination algorithms on accuracy.
• Computed tomography (CT) data was used for all analyses.

Main Results:

• Artificial displacement of measurement sectors significantly alters TMJ parameter values, highlighting the importance of accurate longitudinal axis determination.
• Manual correction of condyle and articular fossa contours introduces the greatest inaccuracy and variability.
• No significant difference in measurements was observed when measurement sectors started from the articular tubercle apex versus a line parallel to the Frankfurt horizontal.
• Statistically significant differences in upper and posterior joint space width were found between normal and TMJ dysfunction groups.

Conclusions:

• Established optimal settings for 3D TMJ parameter analysis, minimizing human error.
• Provided justified average values for intra-articular space width.
• The optimized method can serve as a basis for virtual planning in prosthetic and orthodontic treatments.