Preliminary Impressions

Front 1

_________ is the first step in denture construction.

Back 1

Examination

Front 2

A thorough examination includes an
___ __________.

Back 2

x-ray examination

Front 3

An x-ray examination enables the dentist to determine the presence of _______ _______, _________, _______ or ________

Back 3

embedded teeth, roots, cyst or tumors

Front 4

T OR F: Usually the findings in the x-ray examination are ignored by the dentist before the construction of the dentures is initiated.

Back 4

FALSE! The findings are removed or in some cases at the dentist discretion left in place.

Front 5

_________ is the first step in denture construction.

Back 5

Examination

Front 6

A thorough examination includes an
___ __________.

Back 6

x-ray examination

Front 7

An x-ray examination enables the dentist to determine the presence of _______ _______, _________, _______ or ________

Back 7

embedded teeth, roots, cyst or tumors

Front 8

T OR F: Usually the findings in the x-ray examination are ignored by the dentist before the construction of the dentures is initiated.

Back 8

FALSE! The findings are removed or in some cases at the dentist discretion left in place.

Front 9

The quality of the ______which will support the denture is also evaluated through the x-ray examination.

Back 9

bone

Front 10

T OF F: The tissue that supports a denture stays the same over time.

Back 10

FALSE! The tissue changes with time.

Front 11

Since a complete denture is made of a material which is stable dimensionally over tissue that changes over time what effect can take place?

Back 11

Decreased accurate adaptation of the denture to the tissue

Front 12

T OR F: Decreased adaptation fo the denture base to the tissue may result in tissue displacement.

Back 12

TRUE.

Front 13

T OR F: Preliminary impressions are usually made of alginate or impression compound

Back 13

TRUE

Front 14

Preliminary cast may be made of either ________ or ________.

Back 14

PLASTER; STONE

Front 15

All impressions will be easy to pour is the surface is ________.

Back 15

damp

Front 16

When using plaster to make a preliminary cast must have what kind of consistency?

Back 16

A THICK consistency.

Front 17

The plaster flows around the impression to avoid what?

Back 17

to avoid TRAPPING AIR BUBBLES

Front 18

T OR F: After the impression if filled it is topped off with plaster so that the borders are covered

Back 18

TRUE

Front 19

T OR F: A thick patty of plaster is put on a glass slab spread as wide as the slab

Back 19

FALSE! The plaster should be about the size of the base of the cast

Front 20

The plaster should be pulled up around the borders of the impression with a plaster ______ or ______.

Back 20

SPATULA; KNIFE

Front 21

______ wax can be used by the dentist to make the tray more accurate and help confine the impression material with in the tray.

Back 21

Utility

Front 22

A _____ surface will result if the impression is separated from cast before the gypsum has set.

Back 22

Rough

Front 23

T OR F: A cast with a rough surface is still accurate

Back 23

FALSE. It is not accurate

Front 24

To be safe an impression should not be separated from the cast for at least how many minutes?

Back 24

45 minutes

Front 25

Is the same procedure used for pouring the mandibular impression as the maxillary?

Back 25

Yes

Front 26

The buildup on the lingual surface of the mandibular impression will cause what kind of difficulties?

Back 26

Separation difficulties with the tray from the cast will occur

Front 27

A plaster _______ can be used to scrape any excess plaster from the lingual surface.

Back 27

spatula

Front 28

T OR F: The maxillary impression is removed from the cast after the plaster has completely set

Back 28

TRUE

Front 29

Maxillary impressions are best removed how?

Back 29

By lifting the posterior end and removing the impression in an anterior direction especially when there is a deep labial undercut

Front 30

After removal of both impression the excess______ is trimmed down to the _________ point of the border roll on the cast.

Back 30

plaster; broadest

Front 31

T OR F: Trimming beyond the broadest point on the border roll will not caues inaccuracies

Back 31

FALSE!

Front 32

T OR F: Additional trimming is fine after the outline of the custom tray is placed on the cast

Back 32

TRUE

Front 33

Both max and mandibular cast are trimmed on a what? Why?

Back 33

A cast-trimmer.So that there will be a uniform ledge or land area 3 millimeters wide is pronounced around the cast