PRINCIPLES, CLASS I, CLASS II Flashcards
(89 cards)
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
2
Q
dependent on the materials that you are going to use
A
CAVITY PREPARATION
3
Q
True or false
One of the OBJECTIVES OF CAVITY PREPARATION:
- Remove all defects and give the necessary protection to the pulp
A
True
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
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
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
7
Q
O
A
Occlusal Tooth Preparation
8
Q
MO
A
Occlusal and Mesial Surfaces
9
Q
MOD
A
Mesial, Occlusal, and Distal Surfaces
10
Q
prepared surface that extends to the external tooth surface
A
EXTERNAL WALL
11
Q
such a wall takes the name of the tooth surface (or aspect) that
the wall is adjacent to
A
EXTERNAL WALL
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
13
Q
prepared surface that does not extend to the external tooth surface
A
INTERNAL WALL
14
Q
ex.:
o axial wall
- parallel with the long axis of the tooth
A
INTERNAL WALL
15
Q
pulpal wall and gingival wall
- -perpendicular to the long axis of the tooth also called floors or seats
A
INTERNAL WALL
16
Q
CAVITY PREPARATION ANGLES
A
LINE ANGLES
POINT ANGLES
17
Q
junction of two planar surfaces of different orientation along a line
A
LINE ANGLES
18
Q
two walls forming a line
A
LINE ANGLES
19
Q
internal line angle if the apex points into the tooth
A
LINE ANGLES
20
Q
external line angle if the apex points away from the tooth
A
LINE ANGLES
21
Q
junction of three planar surfaces of different orientation forming a point
A
POINT ANGLES
22
Q
An angle usually seen in Class II
A
POINT ANGLES
23
Q
for the point angles, there is an additional axiolingual gingival
point angle or axiofacial gingival angle
A
POINT ANGLES
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
25
the actual junction
CAVOSURFACE MARGIN
26
90 degrees cavosurface angle
CAVOSURFACE MARGIN in Amalgam
27
butt joint cavosurface margin
CAVOSURFACE MARGIN in Amalgam
28
rationale:
o to prevent fracture at the margins since amalgam has weak edge strength
CAVOSURFACE MARGIN in Amalgam
29
In CAVOSURFACE MARGIN in Composite what degree angle is for Class I
90 degrees cavosurface angle
30
In CAVOSURFACE MARGIN in Composite what degree angle is for Class II
45 degrees cavosurface angle
31
true or false
In CAVOSURFACE MARGIN in Composite what degree angle is for Class III, IV & V, bevel cavosurface
margins
True
32
In CAVOSURFACE MARGIN in Cast Gold/Metal what degree angle?
45 degrees
33
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.
True
34
Arrange:
Initial Tooth Preparation Stage
Convenience Form
Primary Retention Form
Outline Form and Initial Depth Primary Resistance Form
Outline Form and Initial Depth Primary Resistance Form Primary Retention Form Convenience Form
35
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
1, 5, 4, 3, 2
36
shape of the area of the tooth surface included within the cavosurface margins of the prepared cavity
STEP 1: OUTLINE FORM
37
to establish the initial depth for tooth preparation until the junction between enamel and supporting dentin is uncompromised
STEP 1: OUTLINE FORM
38
the peripheral walls determine the overall outline of the preparation
STEP 1: OUTLINE FORM
39
True or false
All friable enamel or weakened enamel should be removed
True
40
True or false
All faults should be excluded
False
All faults should be included
41
True or false
All margins should be placed in a position that would allow
good finishing of the margin of the restoration
True
42
move around the cusp
- rationale: so as not to put the margins in areas of stress concentration
SPECIFIC FEATURES in the OUTLINE FORM
43
1⁄4 of the intercuspal distance; 1 mm
Isthmus
44
1⁄3 of the intercuspal distance; 2 mm
Dovetail
45
In the outline form, what is the Preserving marginal ridge strength
1.6 - 2.0 mm marginal ridge
46
In the outline form what is the Depth of preparation into dentin for:
pit and fissure caries
for axial wall
pit and fissure caries-0.2
for axial wall- 0.2 - 0.8
47
In outline form Connecting two close faults is less than ______mm apart
0.5 mm
48
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
STEP 2: PRIMARY RESISTANCE FORM
49
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
STEP 2: PRIMARY RESISTANCE FORM
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SPECIFIC FEATURES of:
Minimizing faciolingual extension
OUTLINE FORM
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SPECIFIC FEATURES of :
Enameloplasty
OUTLINE FORM
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(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
RESISTANCE FORM FEATURES
53
to distribute occlusal stress over the entire pulpal
floor
Relatively flat pulpal floor
54
accomplished by using a flat-ended bur such as
inverted cone or 345
Relatively flat pulpal floor
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in deep cavity preparations, GIC is placed for
pulp protection and for a flat floor
Relatively flat pulpal floor
56
exception: in mandibular first premolars the pulpal
floor is parallel to the line drawn from the buccal cusp tip to the lingual cusp tip
Relatively flat pulpal floor
57
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
Box shape
58
extending beyond required isthmus when there is a
lot of infected dentin under enamel to prevent
fracturing
Inclusions of weakened tooth structure
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resistance includes achieving a shape that would
not lead to future fracture of the tooth
Inclusions of weakened tooth structure
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- minimum of 1.6 mm and maximum of 2.0 mm for marginal ridges
- go around cusp to preserve it
Preservation of cusp and marginal ridge
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to eliminate sharp line angles that are areas of
stress concentration that may fracture the cavity walls
Rounded internal line angles
62
What is the Adequate pulpal floor depth of:
__________mm from cavosurface
____________from DEJ
Adequate pulpal floor depth
- 1.5 - 2.0 mm from cavosurface
- 0.2 - 0.5 from DEJ
63
Adequate thickness of restorative material
- depth depends on the restorative material that
will be used in:
Amalgam
Composite
Cast Metal
Porcelain
Amalgam
1.5 - 2. 0 mm
Composite
1.0 - 2.0 mm
Cast Metal
1.0 - 2.0 mm
Porcelain
2.0 mm
64
removal of soft dentin that is below the already flat pulpal floor and filling with glass ionomer cement to conserve tooth structure
Seats on sound dentin peripheral to excavations of infected dentin
65
cutting of cusp when enamel is already too thin
and will fracture in the future
Reduction of cusp for capping when indicated
66
shape or form of the prepared cavity that resist displacement or removal of the restoration from tipping or lifting forces
STEP 3: RETENTION FORM
67
resistance prevents fracture and retention prevents displacement
STEP 3: RETENTION FORM
68
resistance and retention are accomplished at the same time
STEP 3: RETENTION FORM
69
True or false
In the FEATURES of RETENTION FORM it will depend on the restorative material used
True
70
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
True
71
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
False
Dovetails
- should be 2 mm
- in instances where the cusp in the distal side is smaller, it is 1 mm
72
True or false
In RETENTION FORM the Grooves
- doesn’t help to retain the restoration
False
Grooves
- help to retain the restoration
73
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
FEATURES in RETENTION FORM
74
shape that will allow vision, accessibility, and ease of instrumentation in preparing for restoring the tooth
STEP 4: CONVENIENCE FORM
75
provides for adequate observation, accessibility and ease of operation in preparing and restoring the tooth
STEP 4: CONVENIENCE FORM
76
→ extension for convenience
→ extending proximal preparations beyond proximal contact
CONVENIENCE FORM
77
deepening the cavity preparation to access caries for a Class II
cavity preparation
CONVENIENCE FORM
78
True or false
o spoon excavators
o round steel burs at low speed
Are used for REMOVAL OF THE REMAINING CARIOUS DENTIN
True
79
True or false
round carbide burs at high speed are used for REMOVAL OF THE REMAINING CARIOUS DENTIN
True
80
STEP for PULP PROTECTION IN CAVITY PREPARATION
STEP 6
81
for very large preparations, convergence and dovetails may not be enough
STEP 7: SECONDARY RESISTANCE AND RETENTION FORMS
82
use of:
o pins
o locks
o coves
o slots
STEP 7: SECONDARY RESISTANCE AND RETENTION FORMS
83
→ design of the cavosurface margin
→ refining of certain areas of the cavity walls to produce a
degree of smoothness
STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION
84
goal:
o produce the maximum effectiveness of the restorative material being used
STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION
85
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
STEP 8: PROCEDURES FOR FINISHING THE EXTERNAL WALLS OF THE CAVITY PREPARATION
86
cleaning, inspecting and sealing
STEP 9: FINAL PROCEDURES
87
→ removing all chips and loose debris that have accumulated
(wash the prep)
→ drying the cavity preparation but not dessicate as dentin is very
sensitive
STEP 9: FINAL PROCEDURES
88
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
STEP 9: FINAL PROCEDURES
89
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
STEP 9: FINAL PROCEDURES
