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D2 Fall - Fixed Prosth > 9/4: Principles of Tooth Preparations > Flashcards

9/4: Principles of Tooth Preparations Flashcards

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1
Q
  1. What are the 7 principles of tooth design and restoration design?
A

a. Preservation of tooth structure
b. Retention form resistance form
c. Added preparation features
d. Marginal integrity
e. Structural durability of the restoration
f. Preservation of the periodontium

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2
Q
  1. What biologic factors are in consideration with a crown prep?
A

a. Dental pulp
b. Gingival tissues
c. Adjacent teeth

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3
Q
  1. This is known as “vital core”
A

a. Leaving a minimum of 1 mm of dentin surrounding pulp

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4
Q
  1. What problems can you have with pulpal integrity?
A

a. Decreases thickness of dentin
b. Heat transfer during preparation

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5
Q
  1. When preparing a tooth for a crown in a conservative manner, the operator allows for a
A

a. Morphological reduction

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6
Q
  1. This is preservation of the basic primary tooth anatomy within the preparation
A

a. Morphological reduction

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7
Q
  1. As we create our crown preparation, we need to form the tooth utilizing geometric form criteria we call”
A

a. Retention
b. Resistance

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8
Q
  1. Making grooves on the prep were designed for what?
A

a. Resistance and retention

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9
Q
  1. The functional cusp bevel is made for
A

a. Structural durability

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10
Q
  1. The planar occlusal reduction is made for
A

a. Structural durability

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11
Q
  1. The axial reduction was designed for what?
A

a. Resistance and retention

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12
Q
  1. This is prevention of removal along the path of insertion
A

a. Retention

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13
Q
  1. How is retention created?
A

a. 2 opposing vertical surfaces with converging surfaces
b. Cements offering frictional resistance
c. Mechanical factors such as dental cements

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14
Q
  1. This is the prevention of restoration being dislodged by apical or oblique forces
A

a. Resistance

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15
Q
  1. Resistance is typically through what forces?
A

a. Occlusal forces

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16
Q
  1. Can resistance be through lateral forces that are not along the POI?
A

Yes

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17
Q
  1. What is the greatest determining factor in a crown’s dislodgement?
A

a. Resistance

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18
Q
  1. Resistance is built into a preparation by forming walls to block anticipated movement due to
A

a. Leverage
b. Rotation

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19
Q
  1. What factors can affect the resistance form of a tooth preparation?
A

a. Total occlusal convergence
b. Preparation wall length
c. Tooth width after preparation
d. Geometric form
e. Surface area of tooth preparation

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20
Q
  1. These limit the paths of insertion, grooves, boxes vertical planes, pins
A

a. Geometric forms

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21
Q
  1. This is defined as the angle of convergence of taper between 2 opposing walls of a tooth preparation
A

a. Total occlusal convergence

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22
Q
  1. This is defined as the angle of convergence of taper of one wall of a preparation in relationship to the long axis of the preparation
A

a. Inclination

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23
Q
  1. What is the ideal TOC?
A

a. 6 degrees

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24
Q
  1. How much convergence do you want on both sides of the prep?
A

a. 3 degrees = 6 total

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25
Q
  1. Can you see a crown with no taper?
A

a. No, some taper is required

26
Q
  1. As occlusal crown convergence increases, what happens to retention?
A

a. Decreases

27
Q
  1. What is the maximum crown retention in terms of TOC?
A

a. 5 degrees

28
Q
  1. You get approximately 1⁄5 the retention when the TOC is
A

a. 20 degrees

29
Q
  1. Is convergence directly or inversely proportional to retention?
A

a. Inversely

30
Q
  1. The average TOC of a prepared tooth ends up in what range?
A

a. 10-20 TOC

31
Q
  1. Molar preps tend to have _____ TOC than premolar or anterior teeth
A

a. More TOC

32
Q
  1. Mandibular preps tend to have _____ TOC than maxillary preps
A

a. Greater

33
Q
  1. Posterior preps are generally
A

a. Shorter with higher occlusal forces

34
Q
  1. Posterior preps require more
A

a. Angled TOC than anterior teeth

35
Q
  1. The greater the height of the tooth prep wall, the _____ the retention
A

a. Greater

36
Q
  1. Increased height =
A

a. Increased area of cementation = increased retention

37
Q
  1. For every 1 mm increase in wall height, the retention and resistance form
A

a. Increases up to 10%

38
Q
  1. The wall height should be greater than the
A

a. Tipping arc of displacement

39
Q
  1. The shorter the preparation, the _____ the taper MUST be
A

a. Less

40
Q
  1. The taller the preparation, the ______ the taper MAY be
A

a. Greater

41
Q
  1. Can a narrow tooth with a smaller diameter preparation have greater resistance than a wider, larger diameter tooth when they have the same wall height?
A

a. Yes bc the tipping arc

42
Q
  1. The height/wall ratio should be greater than
A

a. 0.4 for all teeth

43
Q
  1. What is the ideal wall height for molars?
A

a. 4mm

44
Q
  1. What is the ideal wall height for incisors and premolars?
A

a. 3mm

45
Q
  1. How is resistance form assessed?
A

a. Measure TOC
b. Measure wall height
c. Measure tooth width ratio

46
Q
  1. If the prep does not have the resistance that you want, what modifications can you make?
A

a. Decrease TOC
b. Addition of grooves
c. Increase wall height

47
Q
  1. Are there times where leaving a crown preparation less than ideal will actually increase the retention and resistance form?
A

Yes

48
Q
  1. What can you do if your TOC is not ideal or your wall height is less than ideal?
A

a. Geometric forms can be added
i. Box
ii. Groove
iii. Pin hole

49
Q
  1. What are the types of geometric forms?
A

a. Box
b. Groove
c. Pin hole

50
Q
  1. What is most common to use for secondary retention?
A

a. Grooves

51
Q
  1. What is the point of 2nd retention?
A

a. Increase surface area
b. Establish parallelism
c. Limits path of draw to one
d. Shorten the arc of rotation and increase resistance

52
Q
  1. Secondary retentive feature should be ideally cut no deeper than
A

a. 1.5mm axially and 2mm occlusally

53
Q
  1. Groove or box forms must have a definite wall _____ to the direction of the displacing force
A

a. Perpendicular

54
Q
  1. Retention is ______ with increased surface area
A

a. Increased

55
Q
  1. Is surface area as important as TOC or height/width?
A

No

56
Q
  1. The crown should fit as closely as possible to minimize cement width. How big is this?
A

a. 25 microns

57
Q
  1. The size of your finish line determines what?
A

a. Bulk of material at the margin
b. Fit of the restoration

58
Q
  1. What are the types of finish lines?
A
59
Q
  1. What are preparation features that contribute to structural durability?
A

a. occlusal/incisal reduction
b. Functional cusp bevel
c. Axial reduction

60
Q
  1. If you don’t have enough axial wall reduction, it will be
A

a. Difficult to finish and loss of strength

61
Q
  1. If you have too much axial reduction, it will cause
A

a. Plaque trap and periodontal inflammation

62
Q
  1. Where should you place margin? (this is how he will ask on exam)
A

a. Supra-gingivally

D2 Fall - Fixed Prosth (6 decks)

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