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Related Experiment Video

Updated: May 19, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Disc displacement and changes in condylar position.

K Ikeda¹, A Kawamura

¹Hillside View Orthodontic Office, Daikanyama Plaza 3F, 24-7, Sarugakucho, Shibuya-ku, Tokyo 150-0033, Japan. ikedakzm@tkd.att.ne.jp

Dento Maxillo Facial Radiology

|August 31, 2012

Summary

Disc displacement (DD) in adolescents and young adults alters condylar position within the glenoid fossa. These changes in condylar position and joint space depend on the type and severity of disc displacement.

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Last Updated: May 19, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

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3D Imaging of PDL Collagen Fibers during Orthodontic Tooth Movement in Mandibular Murine Model

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Published on: April 15, 2021

Area of Science:

Temporomandibular joint (TMJ) disorders
Orthodontics
Diagnostic imaging

Background:

Disc displacement (DD) is a common temporomandibular joint (TMJ) condition.
Understanding condylar position changes is crucial for diagnosing and managing TMJ disorders.
Limited cone beam CT (LCBCT) and MRI are valuable tools for TMJ assessment.

Purpose of the Study:

To investigate the relationship between disc displacement (DD) and condylar position within the glenoid fossa.
To quantify changes in joint space associated with different types of DD.
To evaluate the utility of LCBCT in conjunction with MRI for TMJ analysis.

Main Methods:

Sixty joints from 57 adolescent and young adult subjects (aged 12-20) were analyzed.
Subjects were categorized into four groups based on MRI-confirmed disc status: partial DD (PDD), total DD with reduction (TDDWR), lateral DD (LDD), and medial DD (MDD).
LCBCT images were used to measure joint space changes compared to established norms.

Main Results:

Partial DD (PDD) showed posterior condylar displacement.
Total DD with reduction (TDDWR) resulted in posterior and vertical condylar displacement.
Lateral DD (LDD) led to increased lateral space and decreased central/medial spaces.
Medial DD (MDD) caused increased medial space and decreased lateral/central spaces.

Conclusions:

Disc displacement (DD) significantly influences condylar position in the glenoid fossa among adolescents and young adults.
The observed alterations in joint space are directly correlated with the direction and extent of DD.
These findings highlight the importance of considering DD when assessing condylar position and TMJ health.