Quiz 1 Part 2

Question 1

What is the proper aligment of the articular disc?

Answer 1

Slightly anterior and the thinnest, and most articulate portion is in the middle section.

Question 2

List three actions of the articulator

Answer 2

• Elevate the mandible in a superior direction to eventually contact the maxillary teeth
• Causes clenching of the teeth
• Aids in protrusive movement
• (minammly aids in lateral movement, very minor player)

Question 3

T of F, The masseter is a primary muscle to produce protrusive movement?

Answer 3

False - The masseter is not the primary muscle to produce protrusive movement

Question 4

List the four actions of the Medial Pterygoid

Answer 4

1) Elevate the mandible in a superior direction to eventually contact the maxillary teeth
2) Aid in protrusive movement
3) Produce Mediotrusive movement
4) A minor player in clenching of teeth (perafunctional)

Question 5

What is the primary muscle to produce mediotrusive movement?

Answer 5

Medial pterygoid

Question 6

List the actions of the inferior head of the lateral pterygoid (5)

Answer 6

1) Active during opening movement of the mandible
2) It is the primary muscle of mastication involved with protrusive movement
3) Primary muscle of mastication that produces lateral movements
4) Most frequent muscle of mastication to exhibit SPASMS as a result of some type of occlusal dysfunction (parafunctional)
5) Cannot be palpated

Question 7

There are 5 collective actions of the suprahyoid accessory muscles of mastication, what are they?

Answer 7

1) Elevate hyoid bone
2) Elevate the base of tongue
3) Depress the mandible when hyoid bone is fixed
4) Assist in stabilizing the cranium and the mandible during normal mandibular movements
5) Important for control over pharynx and esophogus

Question 8

What are the four actions associated with normal jaw opening movement

Answer 8

1) The inferior head of the lateral pterygoid contracts
2) The condyle will move anteriorly
3) The articular disc will move with the condyle
4) The superior retrodiscal tissue undergo a slight tautness

Question 9

What action does minimally contracting the superior head of the lateral pterygoid muscle result in?

Answer 9

The articular disc moving with the condyle

Question 10

The inferior head if the lateral pterygoid contracts in what manner?

Answer 10

In a controlled, slow and consistent manner

Question 11

Where does the movement of he condyle begin?

Answer 11

The beginning of the posterior border of the articular eminence

Question 12

Describe the direction of force vector of the anterior temporalis

Answer 12

Superior and lightly anterior

Question 13

What is the posterior temporalis force vector?

Answer 13

Posterior and slightly superior

Question 14

What is the masseter force vector?

Answer 14

Superior and slightly anterior

Question 15

What is the posterior digastric muscle force vector?

Answer 15

superior and posterior

Question 16

What is the Inferior head of the lateral pterygoid muscle force vector?

Answer 16

Anterior

Question 17

What is the most important stage of the normal condyle-disc movement?

Answer 17

Centric movement

Question 18

What movement will contraction of the medial pterygoid produce?

Answer 18

Mediotrusive movement

Question 19

What is the bilaminar region?

Answer 19

Loose vascular tissue which is the posterior attachment for the articular disc and also fills with fluid.

Question 20

The retrodiscal area is the ________part that splits between the ________ and superior retrodiscal ligaments, ________ to the articular disc.

Answer 20

Posterior, inferior, posterior

Question 21

When is the only time that orthopedic stability will exist in occlusion?

Answer 21

When the stable intercuspal position of the teeth is in homony with the mucsuloskeletal stable position of the condyles in fossa

Question 22

what is the most frequent muscle of mastication to exhibit a spams as a result of some type of occlusal dysfunction

Answer 22

The lateral pterygoid