Pathology of TMJ

Question 1

Faulty or incomplete development of the cranial bones or mand
-lack of condylar growth is the most common developmental defect
-Unilateral or bilateral
-Auditory apparatus is often affected
-Occlusal shift and deviation on opening may occur
-rare
-More severe than hypoplasia

Answer 1

Aplasia

Question 2

Is aplasia or hypoplasia worse?

Answer 2

Aplasia

Question 3

Treatment of _____
Osteoplasty
Correction of malocclusion
Plastic surgery

Answer 3

Aplaisa

Question 4

Incomplete developmet of the cranial bones of mand
Congenital or aquired
Growth is normal but proportionaly reduced and less severe
Can be secondary to trauma

Answer 4

Hypoplasia

Question 5

Treacher Collins syndrome is an example of ______

Answer 5

Hypoplasia

Question 6

Unilateral or bilateral
Congenital: idiopathic, early onset
Aquired: forceps deliveries, trauma, radiation, infection, circulatory disorder, endocrine disorders
If unilateral:
-Facial assym
-Limitation of lateral excursion
-Mand midline shift

Answer 6

Condylar hypoplasia

Question 7

Overdevelopment of cranial bones or mand
Congenital or acquired
Non-neoplastic increase in number of normal cells
Localized: condylar hyperplasia
Mand Prognathism- excessive size of mand causing protrusion of chin but normal condyle size, shape and function

Answer 7

Hyperplasia

Question 8

Benign, malignant, or metastatic from a distant site
Uncontrolled gorwth of abnormal tissue
Rare as an underlying cause of TMD
1% of malignant neoplasias
Can affect condyle

Answer 8

Neoplasia

Question 9

Generally occur in young adults but also appear during middle age
-Bones that form from a cartilage anagen are susceptible to single or multiple osteochondritic lesions
-This species of bone tumor frequently remains asymp until they become large enough ot interfere with mand function or cause a shift in the midline

Answer 9

Osteochondroma

Question 10

Does a benign or malig neoplasia destroy bony margins?

Answer 10

Malignant

Question 11

If there is trauma to head and neck, what image should you take every time?

Answer 11

Pano

Question 12

What muscle pulls the condyle anteriorly?

Answer 12

Lateral pterygoid

Question 13

Partial or incomplete condylar dislocation during wide mouth opening but the pat can close voluntarily
-Usually accompanied by a joint sound
-May result from anatomical difference, habit, or trauma

Answer 13

Subluxation

Question 14

Tx:
-Retruded opening exercises
-Control yawn; avoid big macs, apples
-Manage muscle hyperactivity
-Eminectomy

Answer 14

Tx of subluxation

Question 15

Condyle is forcibly moved beyond articular eminence
-unable to return to a close position voluntarily
-may be caused by yawning or trauma
-sudden open lock of jaw

Answer 15

Dislocation of condyle

Question 16

TMJ ____ reperesents fibrous or bony fusion btwn mand condyle and fossa which is usually traumatically caused by condyle fracture
-Could be caused by infections, degenerative ds, injection of corticosteroids, forceps delivery, and complications of TM surg

Answer 16

Ankylosis

Question 17

If one condyle is ankylosed, which side will the midline be deviated toward?

Answer 17

Side affected

Question 18

Radiographs reveal bone proliferation with obliteration of disc space and no condylar translation

Answer 18

Bony ankylosis