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fixed > Principlals of CVC preps part 1 > Flashcards

Principlals of CVC preps part 1 Flashcards

1
Q

What does Fixed Prosthodntic Treatment involve

A

Replacement and restoration of teeth by artifical substitutes that are not readily removable from the mouth

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2
Q

What is Included in Patiente Selection

A 
Chief Complaint
Communication
Dental history
Med History
Palpation
Percussion
Periodontal exam
Systemic conditions
TMJ
TMJ dysfunction
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3
Q

Why the patient is here

A

CHief complaint

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4
Q

what is communication

A

being able to exlain what can be done and affordably

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5
Q

What does Dental history include

A

Fear of the dentist

Past work

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6
Q

What must all be considered in tooth preps

A

Biologic
Mechanical
Esthetic

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7
Q

what does Biologic considersations consider

A

The health of the oral tissue

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8
Q

What does Mechanical considerations consider

A

Affect the integrity and durability of the resotration

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9
Q

What does Esthetic considerations consider

A

The appearance of the patient

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10
Q

What are the parts of the Biological considerations of tooth preps

A

Prevention of damage during tooth preps (soft tissues, pulp, adjacent tooth)
Considerations affecting future dental health ( axial reduction, margins, occlusal considerations, preventing fracture)
Conserving tooth structure

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11
Q

parts of mechanical considerations

A

Resistance form
Retention form
Preventing deformational of the restoration

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12
Q

what is considered for resistance form

A

Magnitude and direction of dislodging forces
GEometry of the tooth prep
Physical properties of the luting agent

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13
Q

What is considered for Retntion

A 
Manitude of Dislodging forces
Geometry of the tooth prep
Roughness of the fitting surface
Materials being cemented
Film thickness of the luting agent
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14
Q

What must be considered to prevent deformation of the restoration

A

Alloy selection
Adequate tooth reduction
Margin design

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15
Q

Types of Corwns

A

CVC- complete veneer crown
MCC- metal ceramic crown
ACC- all ceramic crown
Zirconia

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16
Q

a Cast-gold extracoronal restoration which covers the clinical crown

A

Complete veneer crown (CVC)

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17
Q

The final Shape of the tooth produced by instrumentation to receive a restoration

A

Tooth preparation

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18
Q

What is a complete veneer crown preparation

A

Extracoronal preparation involving the entire clinical crown

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19
Q

The removalable part removed from the main cast to wax up a crown

A

die

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20
Q

How to protect the preped tooth and gingiva while a crown is being

A

A provisional

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21
Q

What does a provisional do to help with neighboring teeth and crown placement

A

Provides contour that keeps nearby teeth from tipping and crowding and hurting crown placement

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22
Q

Indication for a single corwn

A

Extensive coronal destrucution from caries or trauma
Short Clinical crowns
Endodontically treated teeth
Maximum retention and resistance is needed
Correction of axial contour, correction of occlusal plane
Provide Contours to receive a removable partial denture

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23
Q

Contraindication for a single crown

A

If there is an intact buccal or lingual wall
If less than maximum retention and resistance are needed
If objectives are met with a more conservative restoration

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24
Q

Advance of a single corwn

A

Because all axial surface of tooth are included in the preparation, the complete cast crown has greater retention than a more conservative restoration
Greater resistance form than a partial coverage restoration on the same tooth
allows operator to modify axial tooth contour as well as occlusal modification

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25
Q

Advantages of A gold crown

A

High strength

Good retentive qualities

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26
Q

Disadvantages of a crowns ( gold specifically)

A

Removal of tooth structure is extensive and can have adverse effects on the pulp and periodontium
–Because of the proximity of the margin to the gingiva, it is not uncommon to see inflammation of gingival tissues
After cementation, it is no longer feasible to perform electric vitality testing of abutment tooth
Patients may object to the display of metal associated with complete cast corwns

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27
Q

The terminal portion of the perpared tooth ( tooth margin)

A

Finish line

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28
Q

Where the prepared tooth meets the unprepared tooth

A

Finish line

29
Q

A Finish line designed for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle

A

Chamfer

30
Q

The alignment of the long axis of a tooth to a selected plane, often the horizontal plane

A

Axial inclination

Long axis

31
Q

When preparing a Chamfer, what must be sure to be taken care of

A

Don’t leave and unsupported enamel

32
Q

How is the long axis of the tooth determined clinically

A

Bisected the angle formed by opposing axial surfaces in the gingival 3rd of the tooth

33
Q

The specific direction in which a prosthesis is placed on the obutment tooth or remove from it

A

Path of placement of POW

34
Q

What should the POW coincide with

A

The long axis

35
Q

The imaginary line along which a casting is moved when it is separated from its prepared tooth

A

POW

36
Q

The Convergence of two opposing external walls of a tooth preparation as viewed in a given plane

A

Taper

37
Q

The angle formed by the taper

A

Convergence angle

38
Q

The taper formed by opposing axial walls

A

Convergence angle

39
Q

Ideal convergence angle

A

6 degrees

40
Q

recommended convergence angles

A

2-10 degrees

41
Q

More taper means what

A

Less retention

42
Q

any irregularity in the wall of a preped tooth that prevents the seating or removal of a casting

A

Undercut

43
Q

when would a crown preparation be considered to be undercut

A

If a wax pattern cannot be withdrawn from its die without distortion

44
Q

What are som examples of undercuts

A

Depression in the axial walls

Opposing axial walls which do not converge occlusally

45
Q

Sequence steps of doing a CVC

A 
Occlusal guide grooves
Occlusal reduction
Axial guide grooves
Axial reduction (buccal and Lingual)
Axial reduction (interproximal)
Finishing and evaluation
46
Q

Dimentions of the 242 bur

A

.8 tip

1.2-1.3 proximal

47
Q

Dimentions of the 747 bur

A

.6 tip

1- 1.1 Proximal

48
Q

Recommended CVC dimentions

A

Central goove- 1.0mm
Functional Cusp- 1.5mm
Non-functional cusp - 1.0mm
Chamfer width- 0.5mm

49
Q

How deep should depth orientation grooves be

A

.2mm shallower than intended for smoothing later

50
Q

Where is a potential site of fialure

A

The junction of the tooth and restoration at the gingival margin due to cement dissolution or roughness

51
Q

How should the surface look

A

Exhibit overal smoothness with light striations created by the diamond bur (NOT POLISHED)
Also all rounded sharp line angles

52
Q

Interproximal clearance

A

.5mm

53
Q

How high should the chamfer be

A

.5mm above plastic gingiva
1.0mm coronal to CEJ
Whatever is more coronal

54
Q

What should the final preparation provide

A

Maximum conservation of tooth structure
Ideal resistance form
Ideal retention form
Structural durability

55
Q

Why would excess reduction occur

A 
Excessive convergence angle
Prep does not follow tooth anatomy
Pow Diverges from long axis of the tooth
Excessively wide margin
Excessive gingival extension of prep
56
Q

What form resists the removal of the restoration along its pow

A

Retention form

57
Q

What forms resist dislodgement by forces oblique or apical

A

Resistance form

58
Q

what form is occlusogingival length a factor of

A

Retention and resistance

59
Q

Greater the surface area of a prep leads to better of what form

A

Retention and resistance

60
Q

How can one increase the surface area of a prep

A

adding boxes and grooves

61
Q

What would you do if the prep is short

A

As little taper as possible to increase resistance and retention

62
Q

Long parallel axial walls and grooves leads to

A

Good retention and resistance

63
Q

Short, overtapered preparation leads to

A

Restoration easy to remove and there’s less retention and resistance

64
Q

Inadequate retention and resistance can lead to

A

Displacement of the restoration during function

65
Q

Causes of inadequate retention and resistace

A

Excessive convergence angle (greater than 10 degrees)
Inadequate hight of axial walls
Insufficient axial surface area to resist tipping

66
Q

What is importanat to resist distortion and allow for wear duringservice

A

Sufficient bulk

67
Q

How to confirm walls angulation

A

View with one eye at the center of the occlussal surface (NO binocular vision)
hold mirror in an angle 1/2 inch from the preparation and view with 1 eye

68
Q

how wide should the functional cusp bevel be

A

2-3mm wide (not less than 1/4 the axial wall length

69
Q

what is the angle of the functioncusp bevel

A

45 degree angle to the POW

fixed (9 decks)

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