Final Exam

Question 1

What are the three points of reference that are transferred to the articulator from the patient using a facebow?

Answer 1

• plane of occlusion
• axis of rotation
• frankfurt plane

Question 2

What two muscles insert into the genial tubercle?

Answer 2

geniohyoid and genioglossus

Question 3

What is the origin and insertion of the deep masseter muscle?

Answer 3

Origin: zygomatic arch
Insertion: lateral border of ramus of mandible

Question 4

Origin and insertion of the medial pterygoid muscle?

Answer 4

O: medial surface of the lateral pterygoid plate
I: Medial ramus and angle of the mandible

Question 5

when administering anesthetic to the mandibular molars, what muscle is pierced?

Answer 5

superior constrictor

Question 6

What three muscles elevate the mandible?

Answer 6

• temporalis
• masseter
• medial pterygoid

Question 7

What muscle is responsible for protrusion of the mandible?

Answer 7

inferior lateral pterygoid

Question 8

Which teeth have the greatest axial inclination relative to the occlusal plane?

Answer 8

Maxillary central incisors

Question 9

How far does the mandible open before translation occurs?

Answer 9

20-25 mm

Question 10

Rotation occurs in what compartment of the TMJ?

Answer 10

inferior compartment

Question 11

What directions are balancing and working movements?

Answer 11

Balancing: medially
Working: laterally

Question 12

What part of the fossa does the condyle pass over in working movements?

Answer 12

lateral part of articular eminence

Question 13

What part of the fossa does the condyle pass over in balancing movements?

Answer 13

medial slop of articular eminence

Question 14

What part of the fossa does the condyle pass over in protrusive movements?

Answer 14

articular eminence

Question 15

What anatomical part limits the rotational direction of the mandible, and forces the mandible to begin to translate?

Answer 15

• temporomandibular ligament
• stylomandibular ligament
• sphenomandibular ligament

Question 16

How much thicker should the functional cusps of a gold/zirconia crown be than the nonfunctional cusps?

Answer 16

0.5 mm, functional cusps need to be 1.5mm thick and nonfunctional need to be 1.0mm thick

Question 17

What crown material has a lifelike appearance and is nonabrasive to opposing teeth?

Answer 17

zirconia

Question 18

Retention refers to….

Answer 18

forces along the axis of the tooth and away from the crown

Question 19

Resistance refers to…

Answer 19

forces that are apical or oblique to the axis of the tooth

Question 20

What is the definition of centric relation?

Answer 20

The position of the mandible when the condyles are in the most superior and anterior position in the articular fossa, resting on the posterior slope of the articular eminence with the intermediate portion of the articular discs interposed.

Question 21

What are the three occlusal philosophies? Which is preferred?

Answer 21

• mutually protected occlusion
• group function
• balanced

-mutually protected occlusion is preferred

Question 22

Draw Posselt’s evelope of motion from the sagittal view. Label CR, MIP, and functional movements.

Answer 22

–

Question 23

Draw Posselt’s envelope of motion in the frontal plane. Label MIP and postural position.

Answer 23

–

Question 24

Why are CT scans used to plan implants?

Answer 24

You can see how much bone is present and where exactly you can place an implant.

Question 25

Who discovered osteointegration?

Answer 25

P.I. Branemark

Question 26

What kind of metal us used for osteoinegration and why?

Answer 26

Titanium. When it oxidizes, titanium dioxide is biocompatible and allows the bone to heal around it.

Question 27

How do you mount a set of casts in centric relation on someone who complains of joint and muscle discomfort and has significant wear on their teeth?

Answer 27

• take impressions
• mount maxillary cast with facebow measurement
• use deprogrammer
• once deprogrammed, take bite registration with regisil
• mount mandibular cast with bite registration