Diagnostic Casts and Articulator Mounting

Question 1

___ ___ are accurate replica of the patient’s maxillary and mandibular arches.

Answer 1

Diagnostic casts

Question 2

Accurate diagnostic casts transferred to a __-__ articulator are essential in planning fixed and removable prosthodontic procedures.

Answer 2

semi-adjustable

Question 3

Use of a semi-adjustable articulator permits ___ and ___ relationships of the teeth without interferences from protective ___ reflexes (biting or gag reflex).

Answer 3

static; dynamic; neuromuscular

Question 4

T/F. Diagnostic casts should contain no bubbles as a result of faulty pouring.

Answer 4

True.

Question 5

T/F. Diagnostic casts should contain positive nodules on the occlusal surfaces.

Answer 5

False. They should contain NO positive nodules as these could prevent articulation and occlusal analysis.

Question 6

what can occur if any of the alginate impression is unsupported by the tray during setting.

Answer 6

distortion of the impression

Question 7

What is the importance of articulator mounting?

Answer 7

articulator is missing TMJ. It becomes the joint and replica of the patient’s skull. Therefore, you must relate the cast to the joint (articulator)

Question 8

If the impression has bubbles it can leave ___ in the cast.

Answer 8

nodules

Question 9

T/F. When removing the impression one should tease it off.

Answer 9

False. remove the impression with a vertical snapping motion. Teasing off may result in tearing of the thin areas of alignate and distort the impression.

Question 10

The impression should be slight moist and not ___. Too much water will dilute the stone mix and form a chalky weak cast.

Answer 10

wet

Question 11

When pouring the diagnostic cast, how can you avoid trapping air bubbles.

Answer 11

vibrate the stone into the impression then invert the impression and vibrate the stone back into the mixing bowl.

Question 12

which type of articulator often leads to restorations with occlusal discrepancies, as they cannot reproduce the full range of mandibular movements?

Answer 12

small non-adjustable articulators

Question 13

what is the only condition that can accurately be reproduced on a non-adjustable articulator?

Answer 13

ICP intercuspation

Question 14

Which articulator is about the same size as the anatomic structures they represent and uses a face-bow transfer?

Answer 14

semi-adjustable articulator

Question 15

what are the three adjustments found on the semiadjustable articulator?

Answer 15

1. condylar inclination
2. lateral translation movement (Bennett angle)
3. intercondylar distance

Question 16

The angle described by the inclinations of the protrusive and non-working condyle (viewed in a horizontal plane) is referred to as the ___ ___.

Answer 16

Bennett angle

Question 17

What device is used in conjunction with fully adjustable articulators to adjust the condylar elements to follow the tracings obtained intraorally?

Answer 17

pantograph

Question 18

The angle described by the inclinations of the protrusive and non-working side condylar paths as viewed in the sagittal plane is referred to as ___ ___.

Answer 18

Fisher angle

Question 19

what is it called when the articulators have the condyles connected to the lower member?

Answer 19

arcon articulators

Question 20

Those articulators with the condyles connected to their upper members are known as __-___ articulators.

Answer 20

non-arcon

Question 21

What is the primary use of the ear (face)-bow transfer?

Answer 21

to mount the maxillary cast accurately on the articulator

adjust the intercondylar distance

Question 22

T/F. The ear bow transfer is aligned perpendicular to the interpupillary line (horizontal reference).

Answer 22

False. It is aligned parallel.

Question 23

Does the ear bow transfer allow the mandibular cast to be correctly mounted using a centric relation record?

Answer 23

yes.

Question 24

The ear bow transfer orients the ___ cast (long axes of teeth) correctly in space using the ___ point of reference.

Answer 24

maxillary; third

Question 25

what type of articulator is the Mark 320?

Answer 25

semi-adjustable

Question 26

what range does the Mark 320 give for adjustable protusion? fixed Bennett?

Answer 26

0-60 degrees

15 degrees

Question 27

what two types of inclinations can the flat occlusal stand of the Mark 320 use?

Answer 27

0 and 10 degrees inclinations

Question 28

What must be applied to the 10 degree (D/H 10) flat occlusal stand of the Mark 320?

Answer 28

the fence

Question 29

The distance from the tragus to the corner of the eye (canthus) is ___ mm.

Answer 29

13

Question 30

What is the Hanau Formula?

Answer 30

L=H/8+12
L = lateral angle
H=horizontal angle

Question 31

what degrees is the horizontal angle usually set to?

Answer 31

30 degrees

Question 32

T/F. No matter how you change the condylar guidance (H), the effect on lateral angle (L) is small (at about 15 degrees)

Answer 32

True.

Question 33

T/F. The centric relation is dependent on tooth contact.

Answer 33

False, it is independent of tooth contact.

Question 34

For centric relation, the CO=MI in ___% of the population.

Answer 34

10

Question 35

What is missing if CO=MI?

Answer 35

there is no centric slide. meaning that the initial point of contact equal the maximal intercuspation

Question 36

what are the three methods to record CR?

Answer 36

1. chin point guidance
2. anterior deprogrammer
3. bilateral (bimanual) manipulation

Question 37

what are the requirements of centric relation record?

Answer 37

1. along the arc of rotation of the mandible
2. no teeth touching
3. thin
4. soft
5. fast setting
6. dimensionally stable
7. easily verifiable in the mouth and on the mounted casts.

Question 38

If the condylar guidance on the articulator is set at 20o, the ___ ___ has more influence on occlusal morphology.

Answer 38

incisal guidance

Question 39

If the condylar guidance on the articulator is set at 40o, the ___ ___ has more influence.

Answer 39

articular eminence

Question 40

What is the best degree to set the condylar guidance at?

Answer 40

30o give you the ability to work on teeth because it avoids incisors and premolar guidance and allows for molar occlusion.

Question 41

What should you set the articulator’s condylar guidance at if the patient is getting dentures?

Answer 41

0o because there are no teeth present.

Question 42

As the intercondylar distance increases, the distance between the condyle and the tooth ____. This tends to cause ___ angles between laterotrusive pathways.

Answer 42

increases; smaller