Deck 38: Restorative Materials Matrix and Wedge

Question 1

Compomers are a cross between composites and glass ionomers in characteristics and properties.

Answer 1

True

Question 2

The plastic strip matrix is dispensed to approximately ____ inch(es) long.

A) 1/2
B) 1
C) 3
D) 4

Answer 2

3

Question 3

The wedges are usually placed from the lingual on the posterior teeth.

Answer 3

True

Question 4

Moving the __________ increases or decreases the size of the loop to match the diameter of the tooth.

A) vise
B) outer knob
C) inner knob
D) guide channels

Question 5

If the Tofflemire™ matrix band becomes creased or bent during assembly, it is thrown away.

Question 6

Which metal is optional in amalgam alloy?

A) Silver
B) Copper
C) Tin
D) Zinc

Question 7

The Tofflemire™ retainer, contra-angle, is placed on the buccal surface of the anterior.

Question 8

Polymerization is the same as ____________.

A) setting
B) mixing
C) both a and b
D) neither a nor b

Question 9

Mercury levels are determined in the human body by testing the ____________.

A) urine
B) blood
C) eyes
D) hair

Question 10

Scrap mercury and amalgam should be ____________.

A) thrown in the biohazard trash
B) thrown down the sink
C) placed in a covered container with used x-ray fixer solution in it
D) none of the above

Question 11

A sectional matrix system is most often used on Class IV restorations.

Question 12

A common organic polymer matrix contained in composite is ____________.

A) quartz
B) barium
C) silica
D) BIS-GMA

Question 13

The actual mechanical means of combining alloy and mercury is ____________.

A) mixing
B) amalgamation
C) trituration
D) Either b or c

Question 14

The AutoMatrix is a matrix without a retainer.

Question 15

Trituration time of an amalgam alloy is ____________.

A) 5 seconds
B) 10 to 15 seconds
C) 30 seconds
D) best determined by the manufacturer

Question 16

The sectional matrix system uses a separate matrix band/ring for each surface.

Question 17

The wedges are usually placed from the facial when used on posterior teeth.

Question 18

Place the steps of an amalgam procedure in order.
1) Cavity prep
2) Place cavity liner
3) Place amalgam
4) Carve amalgam
5) Check occlusion

A) 1, 2, 3, 4, 5
B) 3, 2, 4, 5, 1
C) 2, 3, 5, 4, 1
D) 1, 3, 2, 4, 5

Question 19

Mercury is a metal.

Question 20

Moving the inner knob will increase or decrease the size of the loop to match the diameter of the tooth.

Question 22

The matrix serves to ____________.

A) replace missing tooth surfaces
B) restore natural contours of the tooth
C) contain the restorative material
D) all of the above

Question 23

The __________ is the part of the Tofflemire retainer that is used to secure the band in the vice.

A) outer knob
B) spindle
C) inner knob
D) guide channels

Question 24

Wedges are used ____________.

A) any time a matrix is used
B) only when the preparation involves a proximal surface
C) only when the preparation involves a large missing tooth wall
D) only when there is quite a bit of bleeding

Question 25

__________ wedges are used with the light-curing restorations matrix to deflect light.

A) wooden
B) transparent

Question 26

A plastic strip matrix is ____________.

A) made of nylon or celluloid
B) used for composite or glass ionomer restorations
C) transparent
D) all of the above

Question 27

The __________ is the part of the Tofflemire retainer that is used to adjust the size of the band.

A) outer knob
B) spindle
C) inner knob
D) guide channels

Question 28

The bottom side of the Tofflemire™ matrix retainer is directed to which of the following?

A) gingival tissue
B) occlusal surface
C) diagonal slot on the vise
D) both a and c

Question 29

Compomers are mostly used on ____________.

A) Class III
B) Class V
C) all types of restorations on primary teeth
D) all of the above

Question 30

This type of matrix system is most often used on Class II restorations called the __________ matrix.

A) sectional
B) strip

Question 31

The excess material escaping between the tooth and the matrix band is called the ____________.

A) overhang
B) margin
C) floor
D) none of the above

Question 32

Place in order the steps for placing and removing the Tofflemire matrix and wedge.
1) Lift the band from around the tooth
2) Place the matrix on the tooth
3) Place the wedge(s)
4) Remove the wedge(s)
5) Separate the retainer from the band

A) 3, 1, 2, 4, 5
B) 3, 2, 5, 1, 4
C) 2, 3, 4, 5, 1
D) 2, 3, 4, 1, 5