Impression trays #WikiDentia

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1. narrowest area buccolingually for impression or denture is located

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a. posterior area

b. anterior area

c. middle area

d. all areas are equal in width

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2. distobucccal area of lower denture should be........ ....to decrease interference with masseter muscle

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a. extend laterally

b. diverge laterally

c. extend posteriorly

d. converge medially

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3. all of the following are muscles inserted at retromolar pad except

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a. superior constrictor muscle of the pharynx

b. buccinators muscle

c. temporalis muscle

d. orbicularis oris muscle

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4. Device used to carry, confine and control impression material while making an impression

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a. Record base

b. record block

c. impression tray

d. occlusion rim

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5.all of the following are modification for customization of tray to patient mouth except

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a. bending

b. building

c. trimming

d. sagging

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66.adaptation of tray to create even thickness of impression by movement their flanges near or away from tissues is

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a. bending

b. building

c. trimming

d. sagging

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7. adaptation of tray to V shaped palate to decrease thickness of impression is considered as

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a. bending

b. building

c. trimming

d. sagging

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8. space required between stock tray and tissues for impression material is

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a. 2mm

b. 4mm

c.10mm

d. 7mm

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9. for reversible hydrocolloids can use

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a. perforated tray

b. plain tray

c. non perforated tray

d. rim lock with water cooling system

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10. special tray is shorter than depth of sulcus by 2mm for border tracing which is type of

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a. bending

b. building

c. trimming

d.sagging

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11. which of the following tray used for wash impression

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a. shellac tray

b. resin tray

c. modeling compound tray

d. plastic tray

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12. plastic sheet technique is more common to be used as

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a. special tray for impression

b. tray for bleaching

C. impression material

d. non of the above

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13. with relining and rebasing techniques ,best special tray to be used

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a. cast metal tray

b. heat cure acrylic resin

c. light cure acrylic resin

d. old denture

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14. for mucocompressive impression technique use

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a. tray with shim

b. open fit tray

C. close fit tray

d. non of the above

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15. with thin mucosa cause pain under pressure so during making impression use

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a. tray with shim

b. open fit tray

C. close fit tray

d. a.b

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16. for flat ridge which type of tray used for impression by

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a. tray with shim

b. open fit tray

C. close fit tray

d. non of the above

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17.usage of shim used for

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a. mucсompressive impression

b. mucostatic impression

C. selective pressure impression

d. functionals impression

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18. for Zn oxide impression boxing use

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a. clay of children boxing

b. wax boxing

c. magnetic strips

d. plaster and pumic boxing

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19. plaster and pumic boxing is used with:

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a. plaster of paris impression

b. compound impression

C. zn oxide impression

d. addition silicon impression

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20. thickness of base of cast shouldn't be less than

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a. 12mm

b. 11mm

C. 10mm

d. 9mm

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21.land area on the cast should be

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a. 2:3mm

b. 3:4mm

C. 5:6mm

d. 6:7mm

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22.which of the following affect size of buccal vestibule

1 point

a. contraction of buccinators muscle.

b. amount of bone resorption

c. ramus and coronoid process

d. all of the above

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