Podcast
Questions and Answers
What movement does the condylar head of the mandible perform during maximum mouth opening?
What movement does the condylar head of the mandible perform during maximum mouth opening?
- Moves sideways and upward
- Moves downward and forward (correct)
- Moves upward and backward
- Remains stationary
To what location does the condylar head move during maximum mouth opening?
To what location does the condylar head move during maximum mouth opening?
- To the base of the articular fossa
- To the superior border of the mandible
- To the midpoint of the mandibular ramus
- To the apex of the articular eminence (correct)
What is the primary direction of movement for the condylar head during mouth opening?
What is the primary direction of movement for the condylar head during mouth opening?
- Anteriorly and inferiorly (correct)
- Inferiorly and medially
- Posteriorly and superiorly
- Laterally and posteriorly
What are the three components of the interarticular disk?
What are the three components of the interarticular disk?
Which anatomical feature does the condylar head reach during mouth opening?
Which anatomical feature does the condylar head reach during mouth opening?
In which position of the mandible is the posterior band of the interarticular disk located on top of the condyle?
In which position of the mandible is the posterior band of the interarticular disk located on top of the condyle?
How is the movement of the condylar head described during normal radiographic imaging of the mandible?
How is the movement of the condylar head described during normal radiographic imaging of the mandible?
What is the role of the intermediate part of the interarticular disk?
What is the role of the intermediate part of the interarticular disk?
Which statement is true regarding the anterior band of the interarticular disk?
Which statement is true regarding the anterior band of the interarticular disk?
Which part of the interarticular disk is located at the middle section?
Which part of the interarticular disk is located at the middle section?
What must occur simultaneously during the opening of the jaw?
What must occur simultaneously during the opening of the jaw?
In cases of anterior displacement when the mouth is closed, where does the posterior band of the disc position relative to the condylar head?
In cases of anterior displacement when the mouth is closed, where does the posterior band of the disc position relative to the condylar head?
What happens to the intermediate zone of the disc during anterior displacement?
What happens to the intermediate zone of the disc during anterior displacement?
Which components are critical for normal jaw opening according to the description?
Which components are critical for normal jaw opening according to the description?
What is the consequence of improper positioning of the disc relative to the condyle?
What is the consequence of improper positioning of the disc relative to the condyle?
What measurement anterior to the articular eminence indicates hypermobility?
What measurement anterior to the articular eminence indicates hypermobility?
Hypermobility is characterized by which of the following conditions?
Hypermobility is characterized by which of the following conditions?
What type of crystals are deposited in the joint space in chondrocalcinosis?
What type of crystals are deposited in the joint space in chondrocalcinosis?
Which of the following statements about hypermobility is true?
Which of the following statements about hypermobility is true?
How are the calcifications typically observed in radiographic imaging of chondrocalcinosis?
How are the calcifications typically observed in radiographic imaging of chondrocalcinosis?
Which characteristic measurement would indicate a healthy condition regarding anterior movement?
Which characteristic measurement would indicate a healthy condition regarding anterior movement?
Which of the following best describes the underlying problem in chondrocalcinosis?
Which of the following best describes the underlying problem in chondrocalcinosis?
What is a common radiographic characteristic of chondrocalcinosis?
What is a common radiographic characteristic of chondrocalcinosis?
What is the abnormal range associated with hypermobility in relation to the articular eminence?
What is the abnormal range associated with hypermobility in relation to the articular eminence?
Chondrocalcinosis can be confused with which of the following conditions due to similar joint symptoms?
Chondrocalcinosis can be confused with which of the following conditions due to similar joint symptoms?
What type of fracture requires investigation for symphyseal fractures?
What type of fracture requires investigation for symphyseal fractures?
Which of the following is a benign tumor that commonly manifests as a bony growth?
Which of the following is a benign tumor that commonly manifests as a bony growth?
What are the notable changes associated with benign tumors like osteoma and osteochondroma?
What are the notable changes associated with benign tumors like osteoma and osteochondroma?
Which of the following is not characteristic of benign tumors like osteoma and osteochondroma?
Which of the following is not characteristic of benign tumors like osteoma and osteochondroma?
What is one characteristic feature of osteochondroma?
What is one characteristic feature of osteochondroma?
Flashcards
Interarticular Disk
Interarticular Disk
A structure within the temporomandibular joint (TMJ) that separates the condyle from the temporal bone.
Posterior Band
Posterior Band
The part of the interarticular disk that sits on top of the condyle in the healthy closed-mouth position.
Anterior Band
Anterior Band
The front part of the interarticular disk.
Intermediate Part
Intermediate Part
Signup and view all the flashcards
Posterior Band Position in Closed Mouth
Posterior Band Position in Closed Mouth
Signup and view all the flashcards
Condylar Head Movement During Opening
Condylar Head Movement During Opening
Signup and view all the flashcards
Apex of the Articular Eminence
Apex of the Articular Eminence
Signup and view all the flashcards
Maximum Mouth Opening
Maximum Mouth Opening
Signup and view all the flashcards
Temporomandibular Joint (TMJ)
Temporomandibular Joint (TMJ)
Signup and view all the flashcards
Mandible
Mandible
Signup and view all the flashcards
Hypermobility of the TMJ
Hypermobility of the TMJ
Signup and view all the flashcards
Hypermobility Threshold
Hypermobility Threshold
Signup and view all the flashcards
Anterior Hypermobility
Anterior Hypermobility
Signup and view all the flashcards
Posterior Hypermobility
Posterior Hypermobility
Signup and view all the flashcards
TMJ Hypermobility
TMJ Hypermobility
Signup and view all the flashcards
Simultaneous Movement of Condyle and Disc
Simultaneous Movement of Condyle and Disc
Signup and view all the flashcards
Anterior Displacement
Anterior Displacement
Signup and view all the flashcards
Posterior Band in Anterior Displacement
Posterior Band in Anterior Displacement
Signup and view all the flashcards
Intermediate Zone
Intermediate Zone
Signup and view all the flashcards
What is chondrocalcinosis?
What is chondrocalcinosis?
Signup and view all the flashcards
Why is chondrocalcinosis called 'pseudogout'?
Why is chondrocalcinosis called 'pseudogout'?
Signup and view all the flashcards
How does chondrocalcinosis appear on an X-ray?
How does chondrocalcinosis appear on an X-ray?
Signup and view all the flashcards
What is the underlying cause of chondrocalcinosis?
What is the underlying cause of chondrocalcinosis?
Signup and view all the flashcards
What is the key characteristic of chondrocalcinosis?
What is the key characteristic of chondrocalcinosis?
Signup and view all the flashcards
Bilateral Fracture
Bilateral Fracture
Signup and view all the flashcards
Symphyseal Fracture
Symphyseal Fracture
Signup and view all the flashcards
Benign Bone Tumor
Benign Bone Tumor
Signup and view all the flashcards
Trabeculae
Trabeculae
Signup and view all the flashcards
Cortication
Cortication
Signup and view all the flashcards
Study Notes
Oral Radiology-2 Study Notes
-
Temporomandibular Joint (TMJ):
- Composed of bony and soft tissue components
- Soft tissue pathologies can affect joint function and integrity
- Bony component: Condylar head, neck, articular eminence, glenoid fossa, external auditory canal
- Soft tissue component: Lateral pterygoid muscle, interarticular disc, retrodiscal tissue
-
Normal TMJ Anatomy:
- Interarticular disc: Anterior, posterior, and intermediate bands
- Posterior band sits atop the condyle in closed mouth position
- Middle zone articulates with condyle and glenoid fossa
- Retrodiscal tissue is common site of perforation
- Arthrography is the best method for visualizing perforation
- Cone Beam Computed Tomography (CBCT) is for bony structures
- Magnetic Resonance Imaging (MRI) is used for articular disc visualisation, showing posterior band on condylar head and possible medial/lateral displacement
- Interarticular disc: Anterior, posterior, and intermediate bands
-
Normal Radiographic Imaging of the Mandible in Closed Position:
- Condylar head typically centrally located in glenoid fossa
- Variations are normal
- Four distinct abnormal condyle positions are observed
- Posteriorly positioned: Anterior disc displacement
- Anteriorly positioned: Rheumatoid arthritis
- Inferiorly positioned: Fluid/blood accumulation
- Superiorly positioned: Perforation
-
Normal Radiographic Imaging of the Mandible During Opening:
- Condylar head moves downward and forward to articular eminence
- Greater than 8mm anterior to articular eminence is abnormal (hypermobility)
-
Diseases and Anomalies Affecting TMJ:
- Condylar Hyperplasia: Enlargement of condylar head and ipsilateral mandibular ramus, often with midline shift
- Coronoid Hyperplasia: Enlargement of coronoid process, impinging on medial zygomatic arch; causes limited mouth opening
- TMJ Arthritis: Various causes, including rheumatoid arthritis (bilateral), affecting 50% of cases, causing bilateral ankylosis
-
Juvenile Arthrosis: Bone destruction without inflamatory process, absent condylar head, or absent condylar fracture might occur
-
Bifid Condyle: True condylar duplication; may appear as vertical depression (possibly confused for fracture)
-
Internal Derangement/Disc Displacement:
- Normal positioning between condyle and articular eminence, simultaneous condylar and disc movement during opening
- Anterior displacement with or without reduction (depending on ability to return to normal position during opening)
-
Synovial Osteochondromatosis: Metaplastic condition with capsule fragmentation, resulting in cartilaginous and calcified bodies in joint space
-
Chondrocalcinosis (Pseudogout): Deposition of calcium pyrophosphate dihydrate crystals in the joint space; radiographically visible as pinpoint calcifications
-
Fracture: Common site is condylar neck; fracture might shift condylar positions downward, forward, medially from original position, possible increased radiopacity in imaging
-
Benign Tumours: Common ones are osteoma and osteochondroma, which have bone growth traits
-
Malignancy and Metastasis: Can affect TMJ (osteosarcoma and chondrosarcoma are examples)
-
Deep Antegonial Notch: Possible indication of condylar head destruction; compensatory mechanism, caused by hyperactive masticatory muscles
-
Degenerative Joint Disease (DJD): Bone destruction (osteophytes, flattening of surfaces). Often associated with osteoarthritis or osteoarthrosis
-
Osteomyelitis in TMJ: An infection in bone; can spread from elsewhere, appearing as moth-eaten bone or onion-skin periosteal reaction
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz focuses on the anatomy and imaging techniques associated with the Temporomandibular Joint (TMJ). It covers both bony and soft tissue components, as well as methods like MRI and CBCT used for diagnosis. Test your knowledge on normal TMJ anatomy and related pathologies through this insightful quiz.
