Intro to Occlusion

Question 1

Teeth are essential for…

Answer 1

Chewing

Esthetics

Phonetics (speech)

Question 2

Anterior teeth used for…

Answer 2

cutting
tearing
guidance (proprioception)

Question 3

Posterior teeth used for….

Answer 3

masticating
grinding

Question 4

occlude definition

Answer 4

to bring together; to shut
to bring or close mandibular teeth into contact with maxillary teeth

Question 5

occlusion definition

Answer 5

act or process of closure or of being closed

static relationship between the incising or masticating surfaces of maxillary or mandibular teeth

Question 6

Condyle

Be able to describe convexity of mandib. condyle

Answer 6

allows movement of bone. Important feature of mandible.

Question 7

Which structures lay above the condyle?

Answer 7

Temporal Bone, then glenoid fossa, then articular eminence, then condyle

The great alex chin

Question 8

Articular Disc: what its made of and function

Answer 8

Fibrocartilagenous structure
Dense fibrous CT
Allows for ginglymoarthrodial movement.

Condyle starts to slide down when you open wide. If you have click / pop, condyle is not moving together with disc. DISC SHUD BE TRAVELLING ALONG CONDYLE

Question 9

Muscles of Mastication

Answer 9

My mom tells susan da love

Masssater
Medial Pterygoid
Temporalis
Supra and infrahyroid
Digastric
Lateral Pterygoid

Question 10

Masseter facts and location

Answer 10

Masseter widens when you bite down. Helps chew by closing mandible

Strongest muscle of mastication
Superficial and Deep
Elevation (closure) of mandible

Question 11

Temporalis

Answer 11

Assists Masseter. Widens when you bite down. (Where ur temples are)

Elevation of mandible anterior+medial , retrusion of mandible posterior

Question 12

Medial Pterygoid

Answer 12

Elevation (closure) of mandible

Question 13

Lateral Pterygoid

Answer 13

Slide jaw forward = this
slide jaw back. temporalis
they oppose each other to some degree

protrusion of mandible (bilateral)
Lateral movement of mandible (unilateral)
Translates articular disc

Question 14

Supra and Infrahyroid + Digastric

Answer 14

Depression (opening) of mandible

Question 15

Activation of both lateral pterygoids results in ____.

Activation of the posterior temporalis results in ___.

Chewing on right side leads to activation of ____.

Answer 15

protrusion

retrusion

activates left lateral pteryoid

Question 16

Activation of one lateral pterygoid results in _____.

Activation of left lateral pterygoid results in movement of ____.

Answer 16

Lateral translation

Mandible to the right

Question 17

Might see 4 different muscles: Which one does not help closure of the mandible?

Answer 17

…

Question 18

At physiologic rest… tooth contact should / should not occur

Answer 18

should not occur.

Contact should ideally happen only during chewing.

Question 19

Causes of attrition

Answer 19

anxiety, stress, destructive habits

Question 20

Maximal Intercuspal Postition (MIP)

Answer 20

The complete intercuspation of opposing teeth
Closest possible relationship between teeth
“tightest” contacts

MIP= relationship between maxillary and mandibular teeth when they are the closest they can possibly be.

Question 21

Supporting cusp: definition and which part of the teeth are supporting cusps

Answer 21

The working or functional cusp
Responsible for supporting the forces of occlusion

***Maxillary palatal (lingual)

***Mandibular buccal

Question 22

Guiding Cusp

Answer 22

Non-functional cusp

Maxillary facial
Mandibular Lingual

Question 23

Opposing contacts

Answer 23

Maxillary palatal cusp to mandibular fossae

Mandibular Buccal cusps to Maxillary Fossae

Question 24

What 3 muscles depress the mandible?

Answer 24

Muscles that depress the mandible and thus open the jaw include the anterior digastric, mylohyoid, and inferior head of the lateral pterygoid. Jaw-closer muscles consist of the masseter, temporalis, medial pterygoid, and superior head of the lateral pterygoid.