ACC preps Flashcards

(29 cards)

1
Q

what is the incisal edge reduction?

A

2.0mm

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2
Q

the width of an all-ceramic crown shoulder should be approximately ____mm

A

1.0

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3
Q

there needs to be at lease ___ mm of clearance between the prep and the opposing teeth when in occlusion

A

1.0mm

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4
Q

what does the axial first plane cut establish?

A

the path of placement/withdrawal for the crown

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5
Q

what is the purpose of the labial second plane?

A

provides a uniform thickness of porcelain over the labial surface

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6
Q

the _______ is approximately 1/2 the incise-cervical height of the labial surface after incisal reduction

A

labial 2nd plane

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7
Q

what will excessive angulation of the labial 2nd plane result in?

A

over-reduction and a thin incisal edge

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8
Q

what is the ideal convergence angle of the lingual 1st plane?

A

8 degree included angle

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9
Q

maxillary incisors are inclined nearly _____ degrees to the labial

A

30

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10
Q

the _____________ is 100 degrees to the outer surface of the tooth

A

cavosurface margin

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11
Q

what is the range of acceptable shoulder widths?

A

1.0-1.2 mm

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12
Q

how much is the labial (facial) plane reduced?

A

1.5mm

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13
Q

the lingual first plane is reduced ___ to ___mm

A

1.0 to 1.2mm

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14
Q

the lingual 2nd plane (concavity) must be reduced to allow ____mm clearance

A

1.0

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15
Q

how wide must the labial rounded shoulder be?

A

1.5mm

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16
Q

_________ line angles is critical in ACC preps

17
Q

which burr is used for the incisal reduction?

18
Q

why is a 2.0mm incisal reduction needed?

A

for good esthetics

19
Q

the shoulder should extend ___mm lingual to the proximal tooth contact area

20
Q

the shoulder of an ACC prep should be ___mm from the gingiva

A

0.5

half mm above the gingiva

21
Q

each labial guide groove should be placed to the full depth of what bur?

A

256 diamond burr

22
Q

the lingual SECOND plane should be reduced with what burr

A

the 285 (football) burr

23
Q

T/F: the lingual second plane of incisors are prepared flat or slightly concave, while canines have a double concavity

24
Q

list the burrs, in order, that are used for inter-proximal reduction

A

1) 169L carbide
2) 242.6M diamond
3) 256.8M diamond

25
what bur is used to remove the "lip" on the cavosurface margin?
770 diamond
26
where is the "ideal" placement of the cervical margin?
.5mm incisal to the CEJ or the free gingiva (whichever is most coronal)
27
the appropriate path of insertion/withdrawal is 8 degrees from what?
8 degrees from parallel along the long axis of the tooth
28
what is the visual taper of the axial walls on an MCC prep?
6-8 degrees total 3-4 degrees per wall
29
the optimal lingual wall height is ___mm
2