الاسئلة ........

1- density is :
A- mass/volume
b- volume/mass
c- mass x volume

2- the ending of preparation in an indefinite shape is :
A- knife
b- bevel
c- houlder
d - chamfer

3- the rounded ending of preparation is :
A- shoulder
b- bevel
c - knife
d - chamfer

4 - crown preparation margins are known as :
A - bevel
b - shamfer
c - sholder
d - all

5- the proximal contacts of posterior teeth are located in ……. Of the crown, exept the maxillary first and second molar :
A- the occlusal third
b- the gingival third
c- the middle third
d- none

6 - the proximal contacts between the maxillary first and second molars are located in :
A- the occlusal third
b- the gingival third
c- the middle third
d- none

7 - with 0.25 undercut gauge we use ________ clasp;
a- wrought wire
b- gold.
C- co-cr.

8 - which part of the surveyor is moved up and down?
A- vertical arm.
B- swivel arm.
C- horizontal arm.

9 - guide plane ate a component of:
A- minor connector.
B- clasp
c- major connector.

10 - reciprocation is type of:
A- clasp
b- minor connector
c-direct retainer
d- indirect retainer

11 - potassium sulphate in gypsum product acts as :
A- inhibitor
b- initiator
c- retarder
d- activator

12 - if gypsum is heated in a closed container under pressure and heat the result is:
A- plaster.
B- stone
c- die stone
d- investment.

13 - the base of the cast should be not less than …….mm thick at it is thinnest portion:
A - 5-10 mm
b - 10-15 mm
c - 15-20 mm
d - 20-25 mm

14 - it is an instrument used for determining the relative parallelism of tow or more surface of the teeth :
A - flask
b - articulator
c - surviyor
d - none

15 - the part of the axial contoyr that extends from the base of the gingival sulcus past the for margin of the gingval is :
A- emergence profile
b - buccual profile
c - lingual profile
d - all

16 - the facial overcontour usually causes :
A - the accumulation of food debris
b - the accumulation of plaque
c - gingival inflammation

17 - a pointed eminence on the cutting or tearing surface of canine , rounded prominces on the chewing surfces of premol and molars :
A - fossa
b - groove
c - cusp
d - none

18 - a triangular space formed by the contacting convex proximal surfaces of adjacent teeth:
A - embrasure
b - cusp
c - fossa
d - none

19 - a stone , epoxy , or metal plated replica of a tooth that been prepared to recieve a cast fixed restoration :
A - rest
b - crown
c - die