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indirect Restoration > May 17, 2016 > Flashcards

May 17, 2016 Flashcards

1
Q

How much total occlusal convergence do you need for retention and resistance form in the preparation?

A

6-8 degree, in both directions

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2
Q

True or False? Resistance form and retention form can be completely separated from each other.

A

F

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3
Q

How much should the margin be reduced?

A

0.5 mm

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4
Q

How much should the non-functional cusp be reduced

A

1 mm

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5
Q

How much should the functional cusp and functional cusp bevel be reduced?

A

1.5

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6
Q

True or False? Buccal cusp is the functional cusp for #30.

A

T

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7
Q

Explain the curvature of the CEJ

A

more gingival in the buccal and lingual areas

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8
Q

Starting point for the finish line:

A

1 mm above the CEJ

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9
Q

6 preparation steps for full coverage restoration:

A
  1. occlusal 2. B and L 3 inter proximal 4 finalize the axial walls, 5 finish 6 evaluate
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10
Q

What should follow the adjacent teeth after preparation?

A

central groove and tip of the B cusp

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11
Q

What bur to use for cutting guiding grooves

A

?

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12
Q

What do you use to cut the depth groove

A

depth cutting burs (WDL1.0)

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13
Q

If you need a 1mm reduction, what size bur should you use for the guiding groove and why?

A

0.8, so that when you are finishing you do not over reduce

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14
Q

Where do you place the guiding grooves?

A

no specific location

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15
Q

What should you leave in tact when prepping the tooth and why?

A

marginal ridge, so you don’t cut the adjacent tooth

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16
Q

Where does the functional cusp start?

A

5mm above the CEJ, marked on the buccal surface of tooth

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17
Q

How many mm of axial wall height from the finish line do we want?

A

4

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18
Q

Angulation for cutting reduction grooves:

A

45 degrees to long axis of tooth OR follow the non-functional cusp of adjacent tooth

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19
Q

True or False? We should get the DMR and MMR’s for our preparation.

A

F

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20
Q

What bur to use for cutting guiding grooves on axial wall:

A

6878K-016, Champfer bur

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21
Q

6878K-016, Champfer bur has what degree of angulation?

A

6-8 degrees, exactly what we want for our prep

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22
Q

How should the 6878K-016, Champfer bur be angled when prepping the tooth?

A

parallel to the long axis, it is already angled to the exact angle we want, 6-8 degrees

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23
Q

Depth of the grooves should be:

A

1/2 of the 6878K-016, Champfer bur

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24
Q

What will happen if you enter more than half of the chamfer bur?

A

creation of unsupported enamel, prone to chipping

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25
Q

Bur to break contacts:

A

850

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26
Q

Bur to finalize the occlusal table and axial wall:

A

finishing bur

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27
Q

axial wall height:

A

4mm

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28
Q

General shape of #30

A

rectangular, squarish with a rounded line angle

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29
Q

finish line is located:

A

0.5 mm occlusal to CEJ

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30
Q

categories of the principles of tooth preparation:

A

biologic, mechanical, and esthetic

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31
Q

Mechanical considerations for tooth preparation:

A

retention, resistnace, preventing deformation of the restoration (by not reducing enough)

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32
Q

define retention:

A

prevents removal of the restoration along the path of insertion or long axis of the tooth preparation:

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33
Q

What is important for retention:

A

parallelism of the axial wall ? Same angle of opposing walls?

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34
Q

Why do we need resistance form?

A

prevents dislodging during tipping forces; apiece, oblique, or occlusal forces

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35
Q

Factor that influences the retention of the restoration:

A

geometry of the tooth preparation

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36
Q

3 factors in geometry of the preparation:

A

diameter, height, and taper of the preparation

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37
Q

2 teeth, different diameters, which has better retention form?

A

larger diameter

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38
Q

True or False? When the diameters of 2 prepped teeth are the same, the increase in retention is less marked with an increase in height.

A

T

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39
Q

How does the preparation of the axial wall influence retention?

A

retention increases as the axial walls approach parallelism ( does this meant that closer to 6 degrees is better than 8?)

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40
Q

What preparations use the TOC?

A

single tooth crowns or fixed dental prostheses

41
Q

Maximum TOC should not exceed:

A

20 degrees

42
Q

Factor that influences resistance:

A

geometry of the tooth

43
Q

What decreases the resistnace of the restoration?

A

taper or diameter increases OR the height of the preparation is reduced

44
Q

Does a short tooth preparation with large diameters have a lot or little resistance form?

A

very little ( shorter, less

45
Q

How do you shape the tooth preparation?

A

follow the shape of the actual tooth

46
Q

What margin design do we mainly use in indirect?

A

chamfer, shoulder, modified shoulder

47
Q

When is the chamfer margin formed?

A

for complet cast restorations

48
Q

A chamfer margin is formed as what?

A

the negative image of a round-ended tapered diamond

49
Q

What degree taper do diamond bur have?

A

6-8 degrees?

50
Q

What part of the bur forms the axial wall base?

A

the side of the chamfer bur

51
Q

What part of the bur forms the margin?

A

tip of chamfer

52
Q

What is the second plane of buccal axial wall?

A

buccal cusp bevel

53
Q

How deep to cut with the chamfer bur?

A

Half of the bur

54
Q

How should the bur be angled when reducing the buccal and lingual axial walls?

A

in line with the long axis of the tooth

55
Q

Should we use short or long strokes?

A

long

56
Q

How to angle the bur when reducing the axial wallls 1mm above the CEJ:

A

follow anatomy of tooth

57
Q

When opening the proximal contact the cutting motion should be from:

A

gingival to oclusal

58
Q

True or False? when opening the proximal contact you should tilt your bur, following the long axis of the tooth.

A

F. This would create undercut or high TOC

59
Q

Where to place the margin:

A

0.5mm above the CEJ

60
Q

Direction of the bur when placing the margin:

A

follow long axis

61
Q

How to remove marginal unsupported enamel:

A

endcutting bur or hatchet, also creates continuous, smooth margin

62
Q

Evaluate the preparation for:

A

undercut, sharp edges, continuous margin, occlusal and axial reduction, TOC

63
Q

What should you follow when reducing the occlusal surface:

A

the reduction guides and the occlusal anatomy

64
Q

First step in tooth preparation:

A

occlusal reduction

65
Q

What cusps are prepared?

A

non-functional, functional, and functional cusp bevel

66
Q

What does the functional cusp bevel follow?

A

the functional cusp bevel of the adjacent tooth

67
Q

What ‘form’ is the 3.5-4mm axial wall height required for?

A

resistance form

68
Q

Axial wall height on buccal surface of molar is from

A

end of second functional cusp bevel to (most gingival portion of functional cusp bevel) to finish line

69
Q

Axial wall height on lingual surface of molar is from

A

occlusal, axial line angle to the finish line

70
Q

Start from here when defining the occlusal table:

A

the gingival portion/ line of the functional cusp bevel, follow marginal ridge of the mesial and then cusp tissues of the lingual, distal margin ridge and connect

71
Q

What is the margin?

A

the outermost portion of the finish line

72
Q

2 reasons to use compare software

A

independent feedback and assessment

73
Q

Click this for independent feedback:

A

slice plane

74
Q

What are we comparing our preparation against the standard for?

A

surface differences (5), finish line width, axial wall height

75
Q

Which should be loaded first, sample or master

A

master

76
Q

Master is aka:

A

standard

77
Q

Can Compare recognize zipped files?

A

no

78
Q

What colors are the standard preparation and your preparation

A

standard: gray, yours: beige

79
Q

Over reduced area will show up as this color:

A

gray

80
Q

In which planes can slice mode slice the scan?

A

B-L, M-D, and horizontal

81
Q

in which plane is it easiest to evaluate the axial wall reduction?

A

horizontal plane

82
Q

What needs to be defined in Compare Software

A

Margin, axial base and occlusal

83
Q

How do you zoom in and out?

A

middle wheel on mouse

84
Q

How do you rotate around the scan?

A

hold right click down

85
Q

Easier tool to define the axial base:

A

‘Trace’ tool

86
Q

True or False? The functional cusp bevel is not part of the ‘occlusal’ when scanning.

A

F. it is part of it

87
Q

What is the ‘set occlusal angle’ similar to?

A

path of insertion, place preparation at the center of the yellow cylinder

88
Q

Compute the difference under tolerance of __ microns

A

350 (0.35mm)

89
Q

What does it mean if the “% comparison” is 100%?

A

match 100% with standard

90
Q

How is the ‘Finish Line width” labeled in Compare Software?

A

‘Shoulder Width’

91
Q

What is the tolerance for the finish line width for the complete cast crown?

A

200 microns (from 0.5mm) (0.2mm)

92
Q

Tolerance of the axial wall height:

A

500 microns (from 4mm) (0.5mm)

93
Q

What is the finish line called in Compare Software?

A

margin

94
Q

2 options for defining the finish line:

A

‘Trace finish line’ and ‘wand finish line’

95
Q

Placement of cursor when defining finish line:

A

inside the finish line

96
Q

What does the positioning of the axial wall base depend upon?

A

type of bur used, define the most internal portion

97
Q

‘set occlusal angle’ is aka:

A

define path of insertion, center the tooth in the yellow cylinder, if you are off slightly it is not an issue

98
Q

Finish line is from here to here:

A

Axial wall base to the margin (check)

indirect Restoration (54 decks)

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