Question 1

Opening the jaws during speech and mastication involves BOTH elevation and retraction of the mandible. When the jaws close, this involves BOTH depression and protrusion of the mandible.

Accepted Answer

Opening the jaws (or mouth opening) involves depression and protrusion of the mandible, not elevation and retraction. Closing the jaws involves elevation and retraction of the mandible, not depression and protrusion.

Question 2

Including examination of the temporomandibular joint (TMJ) during the extraoral examination is important to detect changes such as disc perforation BECAUSE disc perforation is commonly found in females and males during puberty.

Accepted Answer

The statement is correct, as examination of the TMJ is important to detect changes such as disc perforation. However, the reason is not correct, as disc perforation is actually more common in older adults rather than during puberty. Therefore, while both the statement and the reason are correct, they are not related to each other.

Question 3

The dental professional plays an important role in the recognition, treatment, and maintenance of patients with temporomandibular disorder (TMD). All signs and symptoms related to TMD need to be recorded by the dental professional, as well as any parafunctional habits and related systematic diseases.

Accepted Answer

The dental professional is indeed responsible for recognizing, treating, and maintaining TMD patients, and it is crucial to record all signs, symptoms, parafunctional habits, and related systemic diseases.

Question 4

What is the depression located between the condyle and coronoid process of the temporomandibular joint?

Accepted Answer

The depression located between the condyle and coronoid process of the temporomandibular joint is called the mandibular notch.

Question 5

Which ligament associated with the temporomandibular joint (TMJ) prevents excessive retraction or moving backward of the mandible?

Accepted Answer

The temporomandibular joint ligament, also known as the lateral ligament, prevents excessive retraction of the mandible.

Question 6

When examining the joint, joint sounds may be heard because of disc derangement. Joint sounds are a reliable indicator of temporomandibular disorder (TMD).

Accepted Answer

The first statement is true, as joint sounds can indeed be heard in TMD due to disc derangement. However, the second statement is false, as joint sounds are not always a reliable indicator of TMD as they can also be present in healthy individuals. Other factors, such as pain and restricted movement, must also be considered in diagnosing TMD.

Question 7

The temporomandibular joint (TMJ) allows for movement of the mandible during speech and mastication. Two basic types of movement are performed by the joint and its associated muscles: a gliding movement and a rotational movement.

Accepted Answer

The temporomandibular joint (TMJ) indeed allows for movement of the mandible during speech and mastication, and it performs both gliding and rotational movements.

Question 8

The temporal bone and mandible come together to form the temporomandibular joint BECAUSE a joint is defined as a junction or union between two or more bones.

Accepted Answer

The statement is correct in stating that the temporal bone and mandible come together to form the temporomandibular joint. The reason is also correct and logically relates to the statement, as the definition of a joint supports the idea that two or more bones are involved in its construction. Therefore, both the statement and reason are correct and related.

Question 9

Which of the following ligaments is NOT associated with the temporomandibular joint (TMJ) ?

Accepted Answer

The Stylohyoid ligament is not associated with the temporomandibular joint (TMJ). The Temporomandibular joint ligament, Sphenomandibular ligament, and Stylomandibular ligament are all related to the TMJ.

Question 10

The disc of the temporomandibular joint (TMJ) is attached to the lateral and medial poles of the mandibular condyle. The disc is fully attached to the temporal bone to all sides of the bone.

Accepted Answer

The first statement is true - the disc of the temporomandibular joint is indeed attached to the lateral and medial poles of the mandibular condyle. However, the second statement is false - while the disc of the TMJ is attached to the temporal bone, it is not attached to all sides of the bone.

Question 11

What occurs with the dislocation of BOTH the temporomandibular joints on a patient?

Accepted Answer

The dislocation of both temporomandibular joints is known as bilateral temporomandibular joint subluxation. Subluxation occurs when the mandibular condyles move out of the articular fossae and do not return to their normal position. This can result in limited or painful jaw movement. Cellulitis, paresthesia, and thrombus are not typically associated with temporomandibular joint dislocation.

Question 12

What is the fossa located on the temporal bone that articulates with the mandible?

Accepted Answer

The fossa located on the temporal bone that articulates with the mandible is called the glenoid fossa.

Question 13

The disc of the temporomandibular joint (TMJ) is a fibrous disc located between the temporal bone and the coronoid process of the mandible on each side. This disc conforms to the shape of the bones and is related to normal joint movement.

Accepted Answer

The answer of The disc of the temporomandibular joint (TMJ)...

Question 14

What is another term used for articular fossa of the temporomandibular joint?

Accepted Answer

The term "articular fossa" is often used interchangeably with "glenoid fossa" to refer to the depression of the temporal bone into which the mandibular condyle articulates to form the temporomandibular joint.

Question 15

What type of temporomandibular joint (TMJ) movement(s) occur during lateral deviation of the mandible or shifting of the lower jaw to one side?

Accepted Answer

During lateral deviation of the mandible, the TMJ on the side to which the jaw is moving undergoes rotational movement, while the opposite side undergoes gliding movement.

Question 16

What movement of the temporomandibular joint (TMJ) occurs MAINLY between the disc and the condyle of the mandible in the lower synovial cavity?

Accepted Answer

Rotation occurs mainly between the disc and the condyle of the mandible in the lower synovial cavity of the TMJ.

Question 17

The rest position of the temporomandibular joint (TMJ) is NOT with the teeth biting together BECAUSE as we observe during mastication of food, the mandible returns to the center.

Accepted Answer

The answer of The rest position of the temporomandibular joint...

Question 18

The gliding movement of the temporomandibular joint allows the lower jaw to move forward or backward. What movement of the mandible is involved when the lower jaw moves forward?

Accepted Answer

Protrusion is the movement of the mandible forward, while retraction is the movement of the mandible backward. Elevation is the movement of the mandible upward, while depression is the movement of the mandible downward.

Question 19

The temporomandibular joint (TMJ) is innervated by the maxillary nerve (division) of the fifth cranial or trigeminal nerve. The blood supply to the joint is from branches of the external carotid artery.

Accepted Answer

The TMJ is innervated by the mandibular division of the trigeminal nerve, not the maxillary division. The blood supply to the TMJ does come from branches of the external carotid artery.

Question 20

Which ligament associated with the temporomandibular joint is a landmark for the administration of inferior alveolar local anesthetic nerve block?

Accepted Answer

The sphenomandibular ligament serves as a landmark for the administration of inferior alveolar nerve block. It is located just medial to the mandibular ramus and is easily palpable. This ligament separates the medial aspect of the mandibular ramus from the pterygoid muscles and allows for safe and effective administration of local anesthesia to the inferior alveolar nerve. The other ligaments listed are not used as landmarks for this procedure.

Quiz 5: Temporomandibular Joint