How to Take an Impression

Self-Study Examination

Instructions: After studying the text answer the following true/false or multiple choice questions. Remember, there's only one answer to each question.

1.	The major drawback that makes an impression difficult is:

a) a bevel margin
b) short upper molars
c) too deep of a margin
d) bleeding of the tissues

2.	The recommended method of packing cord around a preparation is to:

a) use one cord
b) soak the cord in epinephrine
c) use two cords
d) keep the cord above the preparation margin

3.	An impression is taken for an acrylic temporary crown using:

a) a Cavit G
b) a dual arch disposable tray
c) a quadrant dual arch disposable tray
d) alginate impression material
e) Coe Flex

4.	The most important phase of making a temporary is:

a) the bite
b) not nicking the preparation
c) preventing holes in the temporary
d) reducing the preparation

5.	When there is bicuspid preparation and neither the posterior or anterior quadrant trays reach it, the author recommends:

a) a maxillary tray
b) Smar Temp
c) Triple Tray by Premium Dental

6.	When taking an impression the preparation is air dried, but first the area should be rinsed to remove blood that may have accumulated.

a) TRUE
b) FALSE

7.	The most important step to remember for the compressed impression is:

a) check the bite
b) place extra material on the pulpal walls
c) to overfill the preparation
d) remind the patient not to clench his teeth

8.	Wax usually leaves a slight opening in the bite registration because the patient:

a) simply does not bite all the way through soft wax
b) clenches his teeth
c) begins gagging
d) has excessive saliva in his mouth

9.	When using the short wax method, the wax bite is cooled with _______ and reinserted into the patient’s mouth.

a) water
b) air
c) nitrogen
d) oxygen

10.	A possible problem occurs when there is not enough tooth structure to obtain an adequate occlusal space to place a porcelain crown. This is especially evident in which of the following:

a) incisor crowns
b) bicuspid crowns
c) third molar crowns

11.	When a patient exhibits Papillary Epithelial Hyperplasia, it is usually caused from:

a) untreated tori
b) infections
c) loose dentures
d) bone loss

12.	The goal in the construction of the ________ denture is to create a suction that will hold it in place.

a) mandibular
b) maxillary

13.	When the maxillary impression is taken, the patient sits almost all the way forward and is instructed to:

a) breath through his nose
b) breath through his mouth
c) swallow frequently
d) place his tongue on the roof of his mouth

14.	Prior to placing the compound in the patient’s mouth you should:

a) massage the cheek
b) check it with the back of your finger
c) microwave it for thirty seconds
d) wear gloves and knead it

15.	The patient will tolerate this material in his mouth as long as he breathes through his nose and the tray is tight to his palate:

a) Coe Flex
b) alginate

16.	When taking a mandibular tray impression, the compound is applied to the buccal side of the tray after:

a) passing it over the flame of a Bunsen burner
b) microwaving it on low for two minutes
c) heating it in hot water

17.	When placing more than one stick in the hot water, they may:

a) need to be trimmed
b) have to be discarded
c) be cooled and reused
d) fuse

18.	For the ________ pour, the stone mixture is placed on one side of the impression and the handle of the tray is vibrated to move the impression to the other side.

a) maxillary
b) mandibular

19.	The size of the flask should be kept in mind during the trimming process. The base does not need to extend more than a(n) _______ of an inch below the ________ extensions.

a) eighth, buccal
b) eighth, lingual
c) quarter, lingual
d) quarter, buccal

20.	To correct a panic situation when a patient fears he will die from lack of air to his lungs, the patient is told to:

a) breath through his mouth
b) hold his breath for a few seconds to calm himself
c) lean forward
d) swallow frequently
e) cough to clear the airway