Dental Occlusion Lab Final Exam

Question 1

Which is NOT a recommended use for a dental articulator?

a. Communicate with dental laboratory for patient treatment lab related procedures.
b. Aid in diagnosis and treatment planning.
c. Serve as a record of patient’s dental condition.
d. Increase practice production

Answer 1

d. Increase practice production

Question 2

The patient’s stone model of the maxillary teeth is to be attached/mounted to which main member of the dental articulator?

a. Maxillary member
b. Upper member
c. Mandibular member
d. Either a. or b.
e. all of the above

Answer 2

d. Either a. or b.

Question 3

The blue colored plastic item with the magnetic center that is used to attach the stone models to the articulator is called

a. the incised guide table.
b. the mounting plate.
c. the attachment triangle.
d. the blue thing.

Answer 3

b. the mounting plate.

Question 4

The centric pin and latch of the articulator, when engaged, are used to maintain (Assume that CR does not equal CO and that the models are mounted in CR.)

a. the centric relation position of the mounted study models.
b. the ICP relationship of the mounted study models.
c. a laterotrusive position of the mounted models.
d. All of the above apply.

Answer 4

a. the centric relation position of the mounted study models.

Question 5

Negative air bubbles found in the stone models are caused by

a. corresponding air bubbles in the alginate impression .
b. corresponding air bubbles in the stone mixture.
c. saliva entrapment on the teeth when taking the impression.
d. All of the above apply.

Answer 5

b. corresponding air bubbles in the stone mixture.

Question 6

Accurate anatomic reproduction of the oral anatomy, including the teeth, can be of diagnostic importance in which area of dentistry?

a. restorative/operative
b. oral surgery
c. orthodontics
d. periodontics
e. all of the above

Answer 6

e. all of the above

Question 7

The stone or plaster base of the model should be at least _______ mm thick at its thinnest point.

a. 2-4
b. 12-15
c. 5-10
d. It is not important.

Answer 7

c. 5-10

Question 8

The recommended consistency of the stone or plaster mixture is similar to

a. tomato juice
b. peanut butter
c. maple syrup
d. saliva

Answer 8

b. peanut butter

Question 9

Stone and plaster diagnostic models should be stored

a. occluded in the ICP position.
b. in a drawer or protected container.
c. as an important part of patient records.
d. All of the above apply.
e. b. and c. only

Answer 9

e. b. and c. only

Question 10

Which procedure is of least importance in the creation of the diagnostic quality study models?

a. the alginate impression
b. mixing and pouring of the plaster or stone
c. impression tray selection
d. none of the above

Answer 10

d. none of the above

Question 11

The use of the spray adhesive in the impression tray is to:

a. insure better retention of the alginate material to the impression tray.
b. add just one more step to the procedure.
c. improve the taste of the impression material.
d. improve the quality of the stone surface when pouring the model.

Answer 11

a. insure better retention of the alginate material to the impression tray.

Question 12

It is not necessary to place the impression tray on a paper towel prior to spraying it with the alginate adhesive because the clinic staff enjoys cleaning the adhesive off of the counter tops and out of the sinks.

a. Both parts of the question are true.
b. Both parts of the question are false.
c. The first statement is true and she second is false.
d. The first part is false and the second is true.

Answer 12

b. Both parts of the question are false.

Question 13

In taking an alginate impression of the patient’s maxillary arch for diagnostic quality purposes, the proper protocol that was demonstrated in lecture and clinic includes:

a. proper tray selection
b. proper loading of the alginate material
c. initial placement of the posterior portion of the tray first
d. careful management of the upper lip to allow the alginate material to flow into and capture the vestibular anatomy
e. all of the above
f. all but d.

Answer 13

e. all of the above

Question 14

Occasionally, the impression tray requires modification in order to avoid impingement into the gingival tissues or heavy contact with the buccal surfaces of the posterior teeth. This is done by:

a. simply bending the buccal phlanges of the tray in the posterior.
b. forcing the tray into fully seated position in the mouth during the impression.
c. carefully heating the posterior buccal walls of the tray and moving them buccally while still soft and letting them cool in the new position
d. waiting to try the tray in the mouth until it is loaded with the alginate impression material.

Answer 14

c. carefully heating the posterior buccal walls of the tray and moving them buccally while still soft and letting them cool in the new position

Question 15

When taking the alginate impression of the mandibular arch, what structure(s) require(s) proper management to assure a diagnostic quality result?

a. the lower lip
b. the patient’s tongue
c. the operator’s lip
d. the operator’s tongue
e. all of the above
f. a and b only

Answer 15

f. a and b only

Question 16

When trimming the stone model of the patient’s teeth, the base of the model should be __________ to the occlusal plane.

a. perpendicular
b. lateral
c. medial
d. parallel

Answer 16

d. parallel

Question 17

According to clinic protocol, it is not necessary to spray the alginate impressions with disinfecting spray and transport them to the lab in a plastic bag because the clinic, lab, hallways and fellow students are resistant to the bacterial content in dental student saliva.

True

False

Answer 17

False

Question 18

The primary purpose of wrapping the alginate impressions in moist paper towels prior to pouring them is to:

a. prevent spread of bacteria
b. prevent drying and distortion of the alginate material
c. hide the gross impressions from sight
d. improve the quality of the stone surface when pouring the model.

Answer 18

b. prevent drying and distortion of the alginate material

Question 19

It is recommended that the alginate impressions be poured up into stone models as soon as possible after they are made.

True

False

Answer 19

True

Question 20

Since most patients aren’t that familiar with alginate impression technique, it is not necessary to involve them with instructions for which procedure(s)?

a. tray selection
b. tongue positioning
c. setting time of the alginate material
d. pouring stone into the impressions

Answer 20

d. pouring stone into the impressions

Question 21

The recommended incisal pin setting for mounting the maxillary model to the upper member of the articulator is:

a. 1.0
b. 0.5
c. 2.0
d. 0.0

Answer 21

d. 0.0

Question 22

The primary reason for not extending the mounting stone beyond the borders of the models during the mounting procedure is:

a. to reduce the work involved in finishing the models with lab plaster.
b. to increase the bonding of the mounting stone to the model.
c. to save enough mounting stone for the final finish.
d. to reduce the materials cost of the procedure.

Answer 22

a. to reduce the work involved in finishing the models with lab plaster.

Question 23

The bitefork support is attached to the articulator lower member during the maxillary model mounting procedure in order to:

a. increase the vertical dimension.
b. prevent alteration of the earbow record.
c. impress the manufacture that we are using all of the available components.
d. force the bitefork superiorly and reduce the available space for mounting stone

Answer 23

b. prevent alteration of the earbow record.

Question 24

The earbow record is basically an average value and therefore is not an essential part of the diagnostic mounting process.

a. The first part of the statement is true and the second is false.
b. Both parts of the statement are true.
c. Both parts of the statement are false.
d. The first part of the statememt is false and the second is true.

Answer 24

a. The first part of the statement is true and the second is false.

Question 25

The recommended incisal pin setting for mounting the mandibular model to the articulator is:

a. 1.0
b. 0.5
c. 2.0
d. 0.0

Answer 25

c. 2.0

Question 26

The accuracy of the centric wax record is an essential and important factor in the diagnostic occlusal analysis protocol.

True

False

Answer 26

True

Question 27

The purpose of using elastic bands in mounting the mandibular model to the lower member of the articulator is to:

a. secure the maxillary model to the articulaor.
b. secure the mandibular model to the centric wax record and maxillary model.
c. prevent dislodging of the mandibular model from the centric wax record during the mounting process.
d. insure flexibility to the mounting process.
e. both b and c

Answer 27

e. both b and c

Question 28

The centric latch/lock of the articulator must be down/engaged during which of the mounting procedures?

a. mounting the maxillary model
b. mounting the mandibular model
c. programming the articulator with the protrusive record
d. all of the above
e. a, and b only

Answer 28

e. a, and b only

Question 29

The quality of the diagnostic mounting, from alginate impressions through programing the articulator with the protrusive record, is a reflection of your attention to detail and clinical excellence.

True

False

Answer 29

True

Question 30

The diagnostic quality mounted models are valuable to which procedures?

a. diagnosis
b. treatment planning
c. labortory fabrication of restorations and prostheses
d. patient education
e. all of the above

Answer 30

e. all of the above

Question 31

Outline the necessary steps for accomplishing a diagnostic quality occlusal analysis mounting as you were taught in class.

Answer 31

1. Choose appropriate impression trays
2. Obtain accurate alginate impressions of the upper and lower arches
3. Pour up yellow stone models of the impressions and trim so they are ready to mount
4. Obtain centric wax records, ear bow records, and protrusive wax records
5. Mount the maxillary model to the upper member of the articulator using the ear bow record
6. Mount the mandibular model to the lower member of the articulator using the centric wax record
7. Finish with the white lab plaster to diagnostic quality finish
8. Program the articulator analog using the protrusive wax record

Question 32

List the following equilibration procedures in the correct order from the beginning to the end point of an equilibration:

• Establish optimal guidance contacts, canine guidance and incised guidance; or group function.
• Eliminate deflective excursive contacts in laterotrusive, mediotrusive and protrusive.
• Eliminate deflective closure contacts between CR and CO.
• Reshape sharp, flat, uneven, and rough areas.
• Establish maximal even intercuspal contacts CR=CO.

Answer 32

1. Eliminate deflective closure contacts between CR and CO.
2. Establish maximal even intercuspal contacts CR=CO.
3. Eliminate deflective excursive contacts in laterotrusive, mediotrusive and protrusive.
4. Establish optimal guidance contacts, canine guidance and incised guidance; or group function.
5. Reshape sharp, flat, uneven, and rough areas.

Question 33

At completion of an ideal complete equilibration on mounted stone models, the incisal guide pin should:

a. touch the incised guide table at or slightly lower than the initial CR, first tooth contact, setting.
b. touch the incised guide table at or slightly lower than the initial CO (ICP) setting.
c. neither of the above.

Answer 33

b. touch the incised guide table at or slightly lower than the initial CO (ICP) setting.

Question 34

The occlusal analysis of articulated stone mounted models allows the clinician to examine and record:

a. areas of attrition.
b. Angle’s classification of the dental occlusion.
c. premature and uneven intercuspal contacts.
d. deflective excursive tooth contacts.
e. all of the above
f. a and b only

Answer 34

e. all of the above

Question 35

All patients should have a complete equilibration before any restorative treatment is begun.

True

False

Answer 35

False