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Expanded Functions Dental Assisting (EFDA)- Pennsylvania > **Matrices > Flashcards

**Matrices Flashcards

1
Q

What classification(s) of preps require a matrix system?

A

Class 2, 3, 4

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2
Q

What is the purpose of using a matrix system?

A

to act as a temporary/artificial wall for the restorative material to be condensed against

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3
Q

What are the two types of a tofflemire retainer?

A

-straight
-contra-angle

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4
Q

What part of the tofflemire retainer is used to hold the matrix band in the retained and direct it left or right?

A

guide channels

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5
Q

What part of the tofflemire retainer has the opening for the spindle to move in/out of to hold the matrix band in place?

A

the vice

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6
Q

What part of the tofflemire retainer in the vice uses the spindle to hold the matrix band in place?

A

guide slot

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7
Q

In the tofflemire retainer, what is the threaded rod with a pointed tip that is used to secure the matrix band into the vice?

A

spindle

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8
Q

What part of the tofflemire retainer controls the vice to change the circumference of the matrix band loop?

A

inner knob

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9
Q

What part of the tofflemire retainer tightens or loosens the spindle against the matrix band?

A

outer knob

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10
Q

What is a tofflemire matrix band made out of?

A

stainless steel

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11
Q

What are the three common styles of the tofflemire matrix band?

A

-universal
-extended
-pedo

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12
Q

What part of the tofflemire matrix band is positioned to the gingival edge of the tooth?

A

smaller circumference

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13
Q

What part of the tofflemire matrix band is positioned to the occlusal edge of the tooth?

A

larger circumference

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14
Q

What is used to slightly separate the teeth to compensate for the thickness of the matrix band?

A

wedge

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15
Q

Which embrasure is typically larger and therefore, easier to place a wedge?

A

lingual embrasure

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16
Q

How many sectional matrix rings are used for each proximal box?

A

one ring per proximal box

17
Q

What is used to place the sectional matrix ring?

A

forceps

18
Q

How far into the gingiva is the matrix band extended at the gingival margin of the prep?

A

0.5-1.5mm

19
Q

How far above the occlusal surface is the matrix band extended at the junction of the occlusal and lingual surfaces of the tooth?

A

0.5-1.5mm

20
Q

How far into the gingiva is a mylar strip extended at the gingival margin of the prep?

A

at least 1mm

21
Q

How far above the incisal margin of the prep is the mylar strip extended?

A

at least 1mm

Expanded Functions Dental Assisting (EFDA)- Pennsylvania (12 decks)

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