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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle

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Published on: January 11, 2018

Nonlinear Relationship between Temporomandibular Joint Disc Displacement Distance and Disc Length: A Magnetic

Qinlanhui Zhang^1,2, Zheng Ye³, Yange Wu¹

¹State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.

Journal of Clinical Medicine

|December 11, 2022

Summary

The distance of temporomandibular joint disc displacement is linked to disc shape changes in patients with temporomandibular disorders (TMDs). Specific displacement distances may indicate high-risk disc deformation, with length decreasing significantly beyond 1.7 mm.

Keywords:

anterior disc displacement disc morphology magnetic resonance imaging temporomandibular joint

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Area of Science:

Dentistry
Radiology
Biomechanical Engineering

Background:

Temporomandibular disorders (TMDs) affect a significant portion of the population.
Disc displacement is a common finding in TMDs, but its relationship with disc morphology is not fully understood.
Magnetic resonance imaging (MRI) is crucial for evaluating temporomandibular joint (TMJ) disc morphology and position.

Purpose of the Study:

To investigate the association between the distance of temporomandibular joint (TMJ) disc displacement and disc morphology in patients with TMDs.
To identify potential reference values for disc deformation based on displacement distance.

Main Methods:

A cross-sectional study involving 717 joints from 473 subjects with TMDs.
MRI analysis to classify TMJ disc morphology and position, measuring displacement distance and disc length.
Statistical analyses including smoothing spline and piecewise linear regression to explore relationships.

Main Results:

Statistically significant differences in displacement distance were observed across morphological categories and disc positions.
Nonlinear relationships were identified between displacement distance and disc length, with two key turning points (−1.8 mm and 1.7 mm).
Disc width and length-width ratio varied significantly across the identified displacement segments.

Conclusions:

The identified turning points in disc displacement distance may serve as indicators for high-risk disc deformation and anterior disc displacement (ADD).
Disc length shows a sharp decrease with anterior disc displacement when the displacement exceeds 1.7 mm.
Further prospective studies are needed to understand the long-term progression of disc changes.