Theme 2. Gypsum models pouring. Trimming of model’s base. Devices that imitates mandible motions. Models mounting on an articulator.

1. Dental technician should mount models in central occlusion on an occluder. Which element of the occluder is responsible for saving of the vertical dimension of the patient?

A. *Screw with a guide pin

B. Upper member

C. Lower member

D. Hinge connection of members

E. Rising arch of lower member

2. Male patient, 56 year-old, is going to have partial removable denture fabricated. Central occlusion was recorded. Dental technician should attach models to the occluder. Which device is possible to attach models to?

A. *Articulator

B. Copp

C. Larin

D. Samson

E. Gnathodynomometr

3. While pouring model gypsum should be stired well, the surface of the impression should be free of visible water; small amount of gypsum should be placed on the side of impression above the preparation with a spatula and vibrating tilt the impression to flow gypsum across the “bottom” of preparation. Then the impression with gypsum should be inverted. What is the classical shape of the model base?

A. *Heptagon

B. Pentagon

C. Quadrangle

D. Circle

E. Octagon

4. Patient is being determined central relation. The doctor uses axiograph for recording border movement of lower jaw. Which articulator should be used for mounting casts?

A. *Fully adjustable

B. Non adjustable

C. Semi adjustable

D. –

E. –

5. Which element of face bow is entered in the mouth of patient?

A. *Bitefork

B. Nasion relator

C. Bitefork shaft

D. Toggle

E. Earpieces

6. II type occluder imitates movements of lower jaw:

A. *In vertical and horizontal planes

B. In vertical plane

C. With average equivalents for all parts of the motion

D. With individual equivalents for all parts of the motion

7.The principle employed in the use of articulators is the mechanical replication of:

A. *Paths of movement of the posterior determinants

B. Physiological intercondylar distance

C. Bonwill’s triangular

D. Bennett’s motion

E. Anatomic distance between axis of rotation and the teeth

8.While patient’s examination the doctor determines that patient’s midline between upper incisors and lower doesn’t correspond. Left side teeth contact cusp-to-cusp, right side 43-47 teeth don’t contact, the gap in 3-4 mm between upper and lower teeth. Palpation of the left TMJ reveals condylar head in glenoid fossa, right TMJ – at the slope of articular eminentia. Which occlusion is determined?

A. *Left

B. Anterior

C. Right

D. Posterior

E. Central

9.The distance between teeth and axis of rotation of occluder is much shorter than real distance. What interferences it can cause?

A. *Changes cusp, ridges and fissures location

B. Doesn’t interfere

C. Changes teeth location

D. Changes central relation

E. Changes cusp location

10.What is the difference between semiadjustable and fully adjustable articulators?

A. *All above

B. Intercondylar distance

C. Lateral condylar track

D. Lateral and sagittal tracks

E. Nothing above

11. Models are mounted on an articulator where the condylar paths simulating the glenoid fossae are attached to the lower member of the instrument, while the condylar elements are placed on the upper portion of the articulator. What is the design of articulator?

A. *Nonarcon

B. Nonadjustable

C. Semiadjustable

D. Arcon

E. Fully adjustable

12.The doctor attaches lower jaw cast to the articulator for diagnostic. Which patient’s records should be determined for correct mounting of cast?

A. *Central relation

B. Central occlusion

C. Physiological rest

D. Protrusion

E. Laterusion

13. The doctor is recording lateral occlusions of a patient with a help of occlusal impressions. What can be set in articulator with the help of such impressions?

A. *Condylar guidance

B. Correct position of lower jaw

C. Correct position of upper jaw

D. Anterior guidance

14. Working cast – is:

A. *Positive reflection of teeth and supporting structures

B. Negative reflection of teeth and supporting structures

C. Positive reflection of teeth-antagonists

D. Negative reflection of teeth-antagonists

15. The aim of working cast?

A. *Wax modeling and contact with opposing teeth

B. Make diagnosis

C. Contact with opposing teeth

D. Wax modeling

16. Good cast must require such statements EXCEPT:

A. *Bubble along the finish lines of the prepared teeth

B. Distortion free

C. Bubble free, especially along the finish lines of the prepared teeth

D. Insure access for carving wax pattern margins

17. What is the average height of gypsum cast base?

A. *1,5-2 cm

B. 2,5-3 cm

C. 3,5-4 cm

D. 4,5-5 cm

18.What should be used for setting of upper jaw to articulator?

A. *Facebow with registration impression

B. Lower cast

C. Central relation

D. Registration impression

E. Facebow

19.What should be used to lower contact angle or pouring impressions?

A. *Surfactants (ex. soap solution)

B. Water

C. Isolating vanish

D. Debubblizer

E. Alcohol

20.What can be used for making gypsum cast base?

A. *All above

B. Gypsum knife

C. Plastic form

D. Boxing wax

E. Nothing above