Related Experiment Video
Updated: Jan 24, 2026
07:26
Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
Published on: August 22, 2022
1.9K
Changes in condylar dimensions in temporomandibular joints with disk displacement
Bo-Yeon Seo1, Jung-Sub An2, Min-Seok Chang1
1Graduate student, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea.
Summary
Temporomandibular joint (TMJ) condylar dimensions are linked to disk displacements, with smaller depths and heights seen in displacement without reduction. These TMJ changes occur similarly in both sexes.
Area of Science:
- Orthodontics
- Radiology
- Anatomy
Background:
- Temporomandibular joint (TMJ) disk displacement is a common condition.
- Understanding TMJ anatomy is crucial for diagnosing and treating disk disorders.
Purpose of the Study:
- To investigate TMJ condylar dimensions in relation to disk displacement and sex.
- To utilize computed tomography (CT) and magnetic resonance imaging (MRI) for precise measurements.
Main Methods:
- Categorized disk displacements into normal (NR), displacement with reduction (DDR), and displacement without reduction (DDNR) using MRI.
- Calculated linear and angular condylar dimensions from CT scans.
- Analyzed differences using two-way ANOVA, considering disk displacement and sex.
Main Results:
- Condylar depth and height were significantly reduced in DDNR compared to NR and DDR.
- Condylar width decreased progressively from NR to DDNR.
- Anterior condylar angle was larger in NR, while horizontal condylar angle was larger in DDNR.
- No significant sex-based differences were observed in condylar dimension alterations.
Conclusions:
- Condylar dimensions show significant associations with TMJ disk displacements.
- These associations are independent of patient sex.
Related Concept Videos
01:31Position and Displacement
25.1K
The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
25.1K
01:19Displacement Current
3.8K
Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
3.8K
01:23Faraday Disk Dynamo
3.6K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
3.6K
01:16Structural Joints: Synovial Joints
6.5K
Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
6.5K
01:03Structural Joints: Fibrous Joints
3.7K
Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
3.7K
01:17Structural Joints: Cartilaginous Joints
4.0K
As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
4.0K