Exam 1 (Review slides 1-10)

Question 1

Outer Oblique portion of temporomandibular ligament has what function?

Answer 1

Limits normal rotational opening movement

Question 2

Inner horizontal portion of temporomandibular ligament has what function?

Answer 2

Limits posterior movement of condyle & disc

Question 3

5 main points about Centric Relation:

Answer 3

1. It is a condylar position, and does not need any tooth contact to be obtained
2. Establishes the position of the condyle in a superior and anterior location with the disc properly interposed between the condyle and the temporal bone
3. Articulation on the thin portion of the articular disc
4. Described as the most stable position of the condyle
5. A position of the mandible where the musculature displays minimal tonus

Question 4

6 main points about Maximum Intercuspation clinical conditions

Answer 4

1. Teeth determine the occlusal position
2. If centric relation and maximum intercuspation do not coincide, the patient will have a “slide”
3. Most patients have some degree of a slide from centric relation into maximum intercuspation (1-2 mm)
4. Maximum intercuspation is simultaneous contact of all the teeth and is the “endpoint” of the slide
5. All occlusal forces should be concentrated down the long axis of posterior teeth
6. The maximum intercuspation position is dynamic in nature and will change throughout a patient’s life.

Question 5

T or F, Centric relation is described as the least stable position of the condyle

Answer 5

False, most stable

Question 6

T or F, The maximum intercuspation position is dynamic in nature and will change throughout a patient’s life

Answer 6

True

Question 7

T or F, Centric relation establishes the position of the condyle in a inferior and anterior location with the disc properly interposed between the condyle and the temporal bone

Answer 7

False, Superior and Anterior

Question 8

T or F, Maximum intercuspation is asynchronous contact of all the teeth and is the “starting point” of the slide

Answer 8

false, It is simultaneous contact and is the “endpoint” of the slide

Question 9

T or F, Centric Relation is a condylar position, and does not need any tooth contact to be obtained

Answer 9

True

Question 10

T or F, Centric relation is a position of the mandible where musculature displays maximal tonus

Answer 10

False, Minimal tonus

Question 11

Name the 3 normal functional activities of the Temporalis

Answer 11

1. Elevates the mandible in a superior direction to eventually contact the maxillary teeth
2. Retracts or retrudes the mandible
3. Positions the mandible to obtain centric relation

Question 12

What is the parafunctional activity of the Temporalis

Answer 12

Causes clenching of the teeth to occur when the muscle is overused.

Question 13

T or F, the Temporalis is normally involved with producing lateral movement of the mandible

Answer 13

False, is NOT normally involved

Question 14

The relationship of the medial pole of the condyle and the medial pterygoid muscle on one side establishes what?

Answer 14

The mid-most position of the mandible at centric relation

Question 15

What makes the normal curve of occlusion possible?

Answer 15

The interaction of the medial pole of the condyle with the steep medial wall of the fossa prevents the mandibular posterior teeth from moving straight horizontally toward the midline

Question 16

Can the superior head of the lateral pterygoid be palpated?

Answer 16

This muscle is deep in placement and is mostly covered by the medial pterygoid, but the clinician can palpate some portion of the muscle.

Question 17

The superior head of the lateral pterygoid works in concert with what?

Answer 17

the action and inactivity of the inferior head of the lateral pterygoid.

Question 18

Name the parafunctional activity of the superior head of the lateral pterygoid?

Answer 18

It frequently displays a spasm as a result of some types of occlusal dysfunction
- This will result in the articular disc being pulled anteriorly out of the glenoid fossa

Question 19

What are the two normal functional activities of Superior head of the lateral pterygoid muscle

Answer 19

1. It maintains a sustainable and consistent position of the articular disc
2. It is progressively active during closing movement of the mandible

Question 20

What establishes the mid-most position of the mandible at centric relation

Answer 20

The relationship of the medial pole of the condyle and the medial pterygoid muscle on one side

Question 21

Actions of the mylohyoid muscle (3)

Answer 21

1. Slightly depress the mandible
2. Elevate the hyoid, the floor of the oral cavity, and the tongue
3. Very important during speaking and swallowing

Question 22

The 4 actions that occur during the late phase of the mandibular opening movement

Answer 22

1. Inferior head of the lateral pterygoid is at maximum point of contracture
2. The condyle has moved as far to the anterior as it can possible move
3. The articular disc has rotated posteriorly over the posterior portion of the head of the condyle
4. The superior retrodiscal tissues are in maximum tautness and cannot further hold the articular disc in position over the head of the condyle without either stretching or tearing.

Question 23

What prevents any further anterior movement of the condyle as the inferior head of the lateral pterygoid is at maximum point of contracture

Answer 23

The temporomandibular ligament
Stylomandibular ligament
Sphenomandibular ligament
Capsular ligament

Question 24

Where is the condyle located when is has moved as far to the anterior as it can possibly move

Answer 24

It is now located at the inferior border of the slope of the articular eminence

Question 25

What muscle is in maximum contracture, attempting to hold the articular disc over the head of the condyle during late normal jaw opening

Answer 25

The superior head of the lateral pterygoid

Question 26

Anterior, middle and posterior temporalis force vector in a frontal plane

Answer 26

Superior

Question 27

Masseter force vector in a frontal plane

Answer 27

Superior

Question 28

Medial pterygoid muscle force vector in a frontal plane

Answer 28

Superior and slightly medial (mediotrusive)

Question 29

Inferior head of the lateral pterygoid muscle force vector in a frontal plane

Answer 29

Anterior and medial (slightly mediotrusive)