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fixed > Principlals of CVC preps part 1 > Flashcards

Principlals of CVC preps part 1 Flashcards

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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
Advantages of A gold crown
High strength | Good retentive qualities
26
Disadvantages of a crowns ( gold specifically)
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
27
The terminal portion of the perpared tooth ( tooth margin)
Finish line
28
Where the prepared tooth meets the unprepared tooth
Finish line
29
A Finish line designed for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle
Chamfer
30
The alignment of the long axis of a tooth to a selected plane, often the horizontal plane
Axial inclination | Long axis
31
When preparing a Chamfer, what must be sure to be taken care of
Don't leave and unsupported enamel
32
How is the long axis of the tooth determined clinically
Bisected the angle formed by opposing axial surfaces in the gingival 3rd of the tooth
33
The specific direction in which a prosthesis is placed on the obutment tooth or remove from it
Path of placement of POW
34
What should the POW coincide with
The long axis
35
The imaginary line along which a casting is moved when it is separated from its prepared tooth
POW
36
The Convergence of two opposing external walls of a tooth preparation as viewed in a given plane
Taper
37
The angle formed by the taper
Convergence angle
38
The taper formed by opposing axial walls
Convergence angle
39
Ideal convergence angle
6 degrees
40
recommended convergence angles
2-10 degrees
41
More taper means what
Less retention
42
any irregularity in the wall of a preped tooth that prevents the seating or removal of a casting
Undercut
43
when would a crown preparation be considered to be undercut
If a wax pattern cannot be withdrawn from its die without distortion
44
What are som examples of undercuts
Depression in the axial walls | Opposing axial walls which do not converge occlusally
45
Sequence steps of doing a CVC
``` Occlusal guide grooves Occlusal reduction Axial guide grooves Axial reduction (buccal and Lingual) Axial reduction (interproximal) Finishing and evaluation ```
46
Dimentions of the 242 bur
.8 tip | 1.2-1.3 proximal
47
Dimentions of the 747 bur
.6 tip | 1- 1.1 Proximal
48
Recommended CVC dimentions
Central goove- 1.0mm Functional Cusp- 1.5mm Non-functional cusp - 1.0mm Chamfer width- 0.5mm
49
How deep should depth orientation grooves be
.2mm shallower than intended for smoothing later
50
Where is a potential site of fialure
The junction of the tooth and restoration at the gingival margin due to cement dissolution or roughness
51
How should the surface look
Exhibit overal smoothness with light striations created by the diamond bur (NOT POLISHED) Also all rounded sharp line angles
52
Interproximal clearance
.5mm
53
How high should the chamfer be
.5mm above plastic gingiva 1.0mm coronal to CEJ Whatever is more coronal
54
What should the final preparation provide
Maximum conservation of tooth structure Ideal resistance form Ideal retention form Structural durability
55
Why would excess reduction occur
``` 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
What form resists the removal of the restoration along its pow
Retention form
57
What forms resist dislodgement by forces oblique or apical
Resistance form
58
what form is occlusogingival length a factor of
Retention and resistance
59
Greater the surface area of a prep leads to better of what form
Retention and resistance
60
How can one increase the surface area of a prep
adding boxes and grooves
61
What would you do if the prep is short
As little taper as possible to increase resistance and retention
62
Long parallel axial walls and grooves leads to
Good retention and resistance
63
Short, overtapered preparation leads to
Restoration easy to remove and there's less retention and resistance
64
Inadequate retention and resistance can lead to
Displacement of the restoration during function
65
Causes of inadequate retention and resistace
Excessive convergence angle (greater than 10 degrees) Inadequate hight of axial walls Insufficient axial surface area to resist tipping
66
What is importanat to resist distortion and allow for wear duringservice
Sufficient bulk
67
How to confirm walls angulation
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
how wide should the functional cusp bevel be
2-3mm wide (not less than 1/4 the axial wall length
69
what is the angle of the functioncusp bevel
45 degree angle to the POW

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