Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

My Operative Dentistry > Fundamental Of Cavity Preparation > Flashcards

Fundamental Of Cavity Preparation Flashcards

1
Q

Definition of operative dentistry?

A

It is the art and science of the diagnosis, treatment, prognosis of defects of teeth which do not require full coverage restorations for correction, such treatments should result in the restoration of proper tooth form, function and esthetics while maintaining the physiologic integrity of the teeth in harmony relationship with adjacent hard and soft tissues all of which should enhance the general health of a patient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Objective of cavity preparation?

A
  • to remove all the defects and give necessary protection to the pulp
  • locate the margins as conservative as possible
  • form the cavity so that both the tooth and restoration can withstand the load of mastication
  • allow for the esthetics and functional placement of a restorative material
  • the restoration should be retentive
  • the restoration and the remaining tooth structure must resist fracture against the functional forces
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Need of restoration?

A
  • caries
  • malformed, discoloured or fractured teeth
  • restoration replacement
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Factors affecting tooth preparation? 5

A
  1. General factors
  2. Dental anatomy
  3. patient factor
  4. Affected and infected dentin
  5. Restorative material factors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

General factors affecting tooth preparation

A
  • pulpal and periondantal status

- occlusal relationship

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Dental anatomy affecting tooth preparation

A
  1. Direction of enamel rods
  2. Thickness of enamel and dentin
  3. Size and position of pulp
  4. Relationship of tooth to its supporting tissue
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Patient factors affecting tooth preparation

A
  1. Age (pulp cavity)
  2. Esthetic consideration
  3. Economic status
  4. Patient with high risk caries
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Approach of operative dentistry

A
  1. Cavity preparation
  2. Matrix application
  3. Preparation of materials
  4. Insertion and carving of materials
  5. Finishing and polishing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is cavity preparation?

A

The mechanical alteration of a defective, injured or diseased tooth in order to best receive a restorative material which will reestablish a healthy state for the tooth esthetic correction where indicated along with normal form & function.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Cavity structure

A
  • walls(axial wall, pulpal)
  • angle(point,line)
  • floor
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Initial tooth preparation stages

A
  1. Outline form and initial depth
  2. Primary resistance form
  3. Primary retention
  4. Convenience form
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Final tooth preparation stages

A
  1. removal of any remaining infected dentin and old restorative material
  2. pulp protection
  3. secondary resistance and retention forms
  4. procedure for finishing external walls
  5. final procedure of cleansing, inspecting and sealing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is external wall?

A

A prepared cavity wall that extends to the cavity margin or the external tooth surface.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is internal wall?

A

A prepared cavity wall that does not extend to the cavity margin or the external surface.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is axial wall?

A

An internal wall parallel to the long axis of the tooth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Pulpal floor/wall

A

An internal surface of the cavity perpendicular to the long axis of the tooth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is a floor?

A

A floor or a seat is a prepared wall that is reasonably flat and perpendicular to the occlusal forces that are directed occlusal-gingivally, e.g. pulpal floor and gingival seat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is line angle?

A

Junction of two planar surface of different orientation along a line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is point angle

A

Junction of three planar surface of different orientation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How many line angle and point angle in class I cavity?

A

Line angle : 8

Point angle : 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Class II cavity line angle and point angle?

A

Line angle : 11

Point angle : 6

22
Q

Class III cavity line angle and point angle?

A

Proximal approach :
Line angle -6
Point angle -3

Palatal approach
Line angle -5
Point angle -2

23
Q

Class IV cavity line angle and point angle?

A

Proximal approach
Line angle -11
Point angle - 6

Palatal approach
Line angle -7
Point angle-3

24
Q

Class v cavity line angle and point angle?

A

Line angle -8

Point angle -4

25
Q

What is cavosurface margin and cavosurface?

A

It is the outer margin of the cavity and the angle formed by the junction of a prepared cavity wall and the external surface of the tooth is called cavosurface angle.

26
Q

What is resistance form?

A

It refers to the features of the cavity design, which resist occlusal force.

27
Q

What is retention form?

A

It refers to the features of the cavity design which resist displacement of the final restoration.

28
Q

Define cavity preparation?

A

It is defined as the mechanical alteration of a defective, injured or diseased tooth in order to best receive a restoration material which will re-establish a healthy state for the tooth including aesthetic correction where indicated along with normal form and function.

29
Q

Establishing the outline forms and initial depth definition ?

A
  • placing the preparation margins in the positions they will occupy in the final preparation
  • preparing an initial depth of 0.2 to 0.8 mm pulpally of the dentinoenamel junction position or the normal root surface position.
30
Q

Principle of outline form and initial depth?

A
  1. All friable and/or weakened enamel should be removed
  2. All faults should be included
  3. All margin should be placed in a position to afford good finishing of the margins of the restorations.
31
Q

Features of outline form and initial depth ?

A
  1. Preserve cuspal strength
  2. Preserve marginal ridge strength
  3. Minimize faciolingual extensions
  4. Use enameloplasty
  5. Connect two close faults on tooth preparations
  6. restrict the depth of the preparation into dentin to a maximum of 0.2mm for pit and fissure caries and 0.2-0.8 mm for axial wall of smooth surface caries.
32
Q

Reasons for the features of the outline form and initial depth?

A
  1. To avoid seating the restoration on the very sensitive DEJ where maximum interconnection of dentinal tubules exist.
  2. To give bulk for the restorative material
  3. To allow the restoration to take advantage of the dentin’s elasticity during insertion and function.
33
Q

Factors that determine Outline form and initial depth for pit and fissure lesions ( class I )?

A
  • the extent to which the enamel has even involved by the carious process
  • the extensions that must be made along the fissures to achieve sound and smooth margins
  • the limited bur depth related to the tooth’s original surface while extending the preparation to sound external walls that have a pulpal depth of approx 1.5-2 mm and maximum depth into dentin of 0.2mm
34
Q

Rules for outline form and initial depth For class I?

A
  1. Extend the tooth preparation margin until sound tooth structure is obtained and no unsupported or weakened enamel remains
  2. Avoid terminating the margins on extreme eminences such as cusp height or ridge crests
  3. If the extension from a primary groove includes one half or more of the cuspal incline consideration should be given to capping the cusp. If the extension is two third, cusp capping should be done.
  4. Extend the preparation margin to include the entire fissure that cannot be eliminated by appropriate enameloplasty
  5. Restrict the pulpal depth of the preparation to a maximum of 0.2 mm into dentin
  6. When two pit and fissure preparation have less than 0.5mm of sound tooth structure between them, they should be joined to eliminate a weak enamel wall between them.
  7. Extend the outline form to provide sufficient access for proper tooth preparation involving the occlusal surface provided other principle are also maintained.
35
Q

What is primary resistance form?

A

Primary resistance form may be defined as that shape and placement of the preparation wall that best enable both the restoration and tooth to withstand without fracture the masticatory forces delivered principally in the long axis of the tooth.

36
Q

Stress bearing area of the teeth?

A
  • cusp tips
  • marginal ridges
  • crossing ridges
37
Q

Stress concentrating areas ?

A
  • axial line angles
  • incisal line angles
  • distal surface of cuspids
38
Q

Weak areas?

A
  • cementum
  • dentin bridge
  • root bifurcation and trifurcation
39
Q

Factors for resistances?

A
  • assessment of occlusal contact areas on both the restoration and the remaining tooth structure
  • the amount of remaining tooth structure also affects the need and type of resistance form
  • the type of restorative materials
  • stress pattern of teeth
40
Q

Principal for primary resistance form?

A
  1. In tractor Ona’s cavity preparation should be in box or inverted truncated cone shaped which helps in better resisting of occlusal loading
  2. Flat pulpal floor for even stress distribution
  3. Restrict the extension of the external walls to allow strong cusp and ridge areas to remain with sufficient dentin support.
  4. To have a slight rounding of internal line angles to reduce stress concentration in the tooth structure
  5. To cap weak cusp and envelope or include enough of weakened tooth structure within the restoration to prevent fracture of tooth
  6. To provide enough thickness of the restorative material to prevent its fracture under load
  7. To bond the material to the tooth structure when appropriate.
41
Q

Vale experiment has proved that the tooth resistance to fracture decreased significantly when

A
  1. Marginal ridge are involved
  2. Inter cuspal distance is increased
  3. Crossing ridge are involved in cavity preparation
42
Q

What is Primary retention form

A

Primary retention form is that shape or form of the prepared cavity that resists displacement or removal of the restoration from tipping or lifting forces

43
Q

Principles for retention form?

A

Since retention needs are related to the restorative materials used, the principles of primary retention form vary depending on the material. Material that can bond to tooth structure do not require or require less mechanical retentive features and vice-versa.

44
Q

Amalgam retentive form?

A

For class I & II

  • developing external cavity walls that converge occlusally ( inverted truncated shape cavity)
  • elastic deformation of dentin
  • dovetail retention : in class II preparations an occlusal dovetail may aid in preventing the tipping of the restoration by occlusal force
45
Q

What is convenience form?

A

Convenience form is that shape or form of the cavity that provides for adequate observation, accessibility and ease of operation in preparing and restoring the tooth

46
Q

Definition of removal of any infected dentin and/or old restorative material?

A

The elimination of any infected carious tooth structure or faulty restorative material left in the tooth after initial cavity preparation.

47
Q

Technique for removal infected dentin.

A

Carious dentin consists of two distinct layers, an outer and an inner layer. The outer layer ( zones 4 and 5 of dentinal caries) is called infected dentin. The inner layer (zones 2 and 3 of dentinal caries) is called as affected dentin. For the removal of infected dentin it must be differentiated from the affected dentin.

48
Q

Infected dentin properties

A
  • bacterial infected layer
  • collagen is irreversibly denatured
  • does not have the ability to reminirelize
  • must be removed during cavity preparation
49
Q

Affected dentin properties?

A
  • no bacteria present
  • reversibly denatured collage
  • has the ability to remineralise
  • should be preserved during cavity preparation
50
Q

Method for clinical differentiation between infected and affected dentin?

A
  • discolouration

- hardness

51
Q

Pulpal protection requires consideration of

A
  1. Chemical protection
  2. Electrical protection
  3. Thermal protection
  4. Pulpal medication
  5. Mechanical protection

My Operative Dentistry (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions