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OPEDENT > PRINCIPLES, CLASS I, CLASS II > Flashcards

PRINCIPLES, CLASS I, CLASS II Flashcards

1
Q

the mechanical alteration of a tooth to receive a restorative material which will return the tooth and area to proper form, function and esthetics

A

CAVITY PREPARATION

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2
Q

dependent on the materials that you are going to use

A

CAVITY PREPARATION

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3
Q

True or false

One of the OBJECTIVES OF CAVITY PREPARATION:

  1. Remove all defects and give the necessary protection to the pulp
A

True

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4
Q

True or false

One of the OBJECTIVES OF CAVITY PREPARATION:

Locate the margins of the restoration as conservatively from the cavity so that under the forces of mastication the tooth or the restoration will not be displaced

A

True

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5
Q

True or false

One of the OBJECTIVES OF CAVITY PREPARATION:

Allow for the esthetic and functional placement of a restorative material

A

True

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6
Q

refers to a set of terms used in communication by persons in the same profession that enables them to understand one another.

A

Nomenclature

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7
Q

O

A

Occlusal Tooth Preparation

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8
Q

MO

A

Occlusal and Mesial Surfaces

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9
Q

MOD

A

Mesial, Occlusal, and Distal Surfaces

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10
Q

prepared surface that extends to the external tooth surface

A

EXTERNAL WALL

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11
Q

such a wall takes the name of the tooth surface (or aspect) that
the wall is adjacent to

A

EXTERNAL WALL

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12
Q

ex.:

o near the buccal/facial surface is the facial and lingual wall

o near the gingiva is the gingival wall/floor and
distal/mesial wall

A

EXTERNAL WALL

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13
Q

prepared surface that does not extend to the external tooth surface

A

INTERNAL WALL

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14
Q

ex.:
o axial wall

  • parallel with the long axis of the tooth
A

INTERNAL WALL

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15
Q

pulpal wall and gingival wall

  • -perpendicular to the long axis of the tooth also called floors or seats
A

INTERNAL WALL

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16
Q

CAVITY PREPARATION ANGLES

A

LINE ANGLES

POINT ANGLES

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17
Q

junction of two planar surfaces of different orientation along a line

A

LINE ANGLES

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18
Q

two walls forming a line

A

LINE ANGLES

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19
Q

internal line angle if the apex points into the tooth

A

LINE ANGLES

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20
Q

external line angle if the apex points away from the tooth

A

LINE ANGLES

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21
Q

junction of three planar surfaces of different orientation forming a point

A

POINT ANGLES

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22
Q

An angle usually seen in Class II

A

POINT ANGLES

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23
Q

for the point angles, there is an additional axiolingual gingival
point angle or axiofacial gingival angle

A

POINT ANGLES

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24
Q

the angle of tooth structure formed by the junction of a prepared wall and the external surface of the tooth

A

CAVOSURFACE ANGLE

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25
Q

the actual junction

A

CAVOSURFACE MARGIN

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26
Q

90 degrees cavosurface angle

A

CAVOSURFACE MARGIN in Amalgam

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27
Q

butt joint cavosurface margin

A

CAVOSURFACE MARGIN in Amalgam

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28
Q

rationale:
o to prevent fracture at the margins since amalgam has weak edge strength

A

CAVOSURFACE MARGIN in Amalgam

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29
Q

In CAVOSURFACE MARGIN in Composite what degree angle is for Class I

A

90 degrees cavosurface angle

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30
Q

In CAVOSURFACE MARGIN in Composite what degree angle is for Class II

A

45 degrees cavosurface angle

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31
Q

true or false

In CAVOSURFACE MARGIN in Composite what degree angle is for Class III, IV & V, bevel cavosurface
margins

A

True

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32
Q

In CAVOSURFACE MARGIN in Cast Gold/Metal what degree angle?

A

45 degrees

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33
Q

True or false

The strongest enamel margin is composed of full-length enamel rods supported on the preparation side by shorter enamel rods, all of which extend to sound dentin with an angle greater than 90 degrees.

A

True

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34
Q

Arrange:

Initial Tooth Preparation Stage

Convenience Form
Primary Retention Form
Outline Form and Initial Depth Primary Resistance Form

A

Outline Form and Initial Depth Primary Resistance Form Primary Retention Form Convenience Form

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35
Q

Arrange:

Final Tooth Preparation Stage

  1. Removal of Any Remaining Enamel Pit and Fissure and/or Infected Dentin and/or Old Restorative Material
    Pulp Protection
  2. Final Procedures (Cleaning, Inspecting, Varnishing and Conditioning)
  3. Procedures for Finishing External Walls
  4. Secondary Resistance and Retention Forms
  5. Pulp Protection
A

1, 5, 4, 3, 2

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36
Q

shape of the area of the tooth surface included within the cavosurface margins of the prepared cavity

A

STEP 1: OUTLINE FORM

37
Q

to establish the initial depth for tooth preparation until the junction between enamel and supporting dentin is uncompromised

A

STEP 1: OUTLINE FORM

38
Q

the peripheral walls determine the overall outline of the preparation

A

STEP 1: OUTLINE FORM

39
Q

True or false

All friable enamel or weakened enamel should be removed

A

True

40
Q

True or false

All faults should be excluded

A

False

All faults should be included

41
Q

True or false

All margins should be placed in a position that would allow
good finishing of the margin of the restoration

A

True

42
Q

move around the cusp

  • rationale: so as not to put the margins in areas of stress concentration
A

SPECIFIC FEATURES in the OUTLINE FORM

43
Q

1⁄4 of the intercuspal distance; 1 mm

A

Isthmus

44
Q

1⁄3 of the intercuspal distance; 2 mm

A

Dovetail

45
Q

In the outline form, what is the Preserving marginal ridge strength

A

1.6 - 2.0 mm marginal ridge

46
Q

In the outline form what is the Depth of preparation into dentin for:

pit and fissure caries

for axial wall

A

pit and fissure caries-0.2

for axial wall- 0.2 - 0.8

47
Q

In outline form Connecting two close faults is less than ______mm apart

A

0.5 mm

48
Q

This step is the shape and placement of the preparation walls done to withstand masticatory forces to prevent fracture of the restoration and tooth during function

A

STEP 2: PRIMARY RESISTANCE FORM

49
Q

the relatively horizontal pulpal and gingival floors prepared perpendicular to the tooth’s long axis help resist forces in the long axis of the tooth and prevent tooth fracture from wedging effects caused by opposing cusps

A

STEP 2: PRIMARY RESISTANCE FORM

50
Q

SPECIFIC FEATURES of:

Minimizing faciolingual extension

A

OUTLINE FORM

51
Q

SPECIFIC FEATURES of :

Enameloplasty

A

OUTLINE FORM

52
Q

(1) Relatively flat pulpal floor

(2) Box shape

(3) Inclusions of weakened tooth structure

(4) Preservation of cusp and marginal ridge

(5) Rounded internal line angles

(6) Adequate pulpal floor depth

(7) Adequate thickness of restorative material

(8) Seats on sound dentin peripheral to excavations of infected dentin

(9) Reduction of cusp for capping when indicated

A

RESISTANCE FORM FEATURES

53
Q

to distribute occlusal stress over the entire pulpal
floor

A

Relatively flat pulpal floor

54
Q

accomplished by using a flat-ended bur such as
inverted cone or 345

A

Relatively flat pulpal floor

55
Q

in deep cavity preparations, GIC is placed for
pulp protection and for a flat floor

A

Relatively flat pulpal floor

56
Q

exception: in mandibular first premolars the pulpal
floor is parallel to the line drawn from the buccal cusp tip to the lingual cusp tip

A

Relatively flat pulpal floor

57
Q

helps the tooth resists occlusal loading by virtue of
being at right angles to the forces of mastication that are directed in the long axis of the tooth

A

Box shape

58
Q

extending beyond required isthmus when there is a
lot of infected dentin under enamel to prevent
fracturing

A

Inclusions of weakened tooth structure

59
Q

resistance includes achieving a shape that would
not lead to future fracture of the tooth

A

Inclusions of weakened tooth structure

60
Q
  • minimum of 1.6 mm and maximum of 2.0 mm for marginal ridges
  • go around cusp to preserve it
A

Preservation of cusp and marginal ridge

61
Q

to eliminate sharp line angles that are areas of
stress concentration that may fracture the cavity walls

A

Rounded internal line angles

62
Q

What is the Adequate pulpal floor depth of:

__________mm from cavosurface
____________from DEJ

A

Adequate pulpal floor depth
- 1.5 - 2.0 mm from cavosurface
- 0.2 - 0.5 from DEJ

63
Q

Adequate thickness of restorative material
- depth depends on the restorative material that
will be used in:

Amalgam

Composite

Cast Metal

Porcelain

A

Amalgam
1.5 - 2. 0 mm

Composite
1.0 - 2.0 mm

Cast Metal
1.0 - 2.0 mm

Porcelain
2.0 mm

64
Q

removal of soft dentin that is below the already flat pulpal floor and filling with glass ionomer cement to conserve tooth structure

A

Seats on sound dentin peripheral to excavations of infected dentin

65
Q

cutting of cusp when enamel is already too thin
and will fracture in the future

A

Reduction of cusp for capping when indicated

66
Q

shape or form of the prepared cavity that resist displacement or removal of the restoration from tipping or lifting forces

A

STEP 3: RETENTION FORM

67
Q

resistance prevents fracture and retention prevents displacement

A

STEP 3: RETENTION FORM

68
Q

resistance and retention are accomplished at the same time

A

STEP 3: RETENTION FORM

69
Q

True or false

In the FEATURES of RETENTION FORM it will depend on the restorative material used

A

True

70
Q

True or false

In RETENTION FORM the Convergence of B-L walls is
3 to 5 degrees and
should not be parallel but slightly converging and not too much converging

A

True

71
Q

True or false

In RETENTION FORM the Dovetails
- should be 1 mm
- in instances where the cusp in the distal side is smaller, it is 2 mm

A

False

Dovetails
- should be 2 mm
- in instances where the cusp in the distal side is smaller, it is 1 mm

72
Q

True or false

In RETENTION FORM the Grooves
- doesn’t help to retain the restoration

A

False

Grooves
- help to retain the restoration

73
Q
  1. Convergence of B-L walls
  2. Dovetails
  3. Grooves

(4) Undercut
(5) Pins
(6) Mechanical bond composite and the conditioned tooth
structures
(7) Parallel longitudinal walls in intracoronal restorations

A

FEATURES in RETENTION FORM

74
Q

shape that will allow vision, accessibility, and ease of instrumentation in preparing for restoring the tooth

A

STEP 4: CONVENIENCE FORM

75
Q

provides for adequate observation, accessibility and ease of operation in preparing and restoring the tooth

A

STEP 4: CONVENIENCE FORM

76
Q

→ extension for convenience
→ extending proximal preparations beyond proximal contact

A

CONVENIENCE FORM

77
Q

deepening the cavity preparation to access caries for a Class II
cavity preparation

A

CONVENIENCE FORM

78
Q

True or false

o spoon excavators
o round steel burs at low speed

Are used for REMOVAL OF THE REMAINING CARIOUS DENTIN

A

True

79
Q

True or false

round carbide burs at high speed are used for REMOVAL OF THE REMAINING CARIOUS DENTIN

A

True

80
Q

STEP for PULP PROTECTION IN CAVITY PREPARATION

A

STEP 6

81
Q

for very large preparations, convergence and dovetails may not be enough

A

STEP 7: SECONDARY RESISTANCE AND RETENTION FORMS

82
Q

use of:

o pins
o locks
o coves
o slots

A

STEP 7: SECONDARY RESISTANCE AND RETENTION FORMS

83
Q

→ design of the cavosurface margin
→ refining of certain areas of the cavity walls to produce a
degree of smoothness

A

STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION

84
Q

goal:
o produce the maximum effectiveness of the restorative material being used

A

STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION

85
Q

objectives:

o to create the best marginal seal between the restorative
material and the tooth

o afford smooth marginal junction

o provide maximal strength for the tooth and material at or
near the margin

smooth the walls to allow better adaptation of the restorative material

A

STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION

86
Q

cleaning, inspecting and sealing

A

STEP 9: FINAL PROCEDURES

87
Q

→ removing all chips and loose debris that have accumulated
(wash the prep)

→ drying the cavity preparation but not dessicate as dentin is very
sensitive

A

STEP 9: FINAL PROCEDURES

88
Q

making a final complete inspection of the preparation for any
remaining infected dentin, unsound enamel margins or any condition that renders the preparation unacceptable to receive the restorative material

A

STEP 9: FINAL PROCEDURES

89
Q

procedure:
o use of warm water from the syringe to remove visible
debris

o use of few light surges of air from the water syringe to
remove the visible moisture

o do not dehydrate the tooth

A

STEP 9: FINAL PROCEDURES

OPEDENT (9 decks)

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