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Fixed lecture 1 Flashcards

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1
Q

Considerations Affecting Future Dental Health

A

Axial reduction
 Margins
 Occlusal considerations
 Preventing tooth fractures

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2
Q

Biologic considerations,

A

which affect the health of the oral tissues.

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3
Q

Mechanical considerations,

A

which affect the integrity and durability of the restoration.

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4
Q

Esthetic considerations,

A

which affect the appearance of the patient

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5
Q

luting agent

A

Cement to maintain

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6
Q

CVC

A

complete veneer crown

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7
Q

MCC

A

metal ceramic crown

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8
Q

ACC

A

all ceramic crown

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9
Q

Zirconia

A

metal, looks nice.

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10
Q

CVC indications

A
  1. Extensive coronal destruction.
  2. Short clinical crowns 3.Endodontically treated teeth.
  3. Maximum retention and resistance are needed.
  4. Correction of axial contours
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11
Q

CVC CONTRAINDICATIONS

A

1.Wherever an intact buccal or
lingual wall exists.
2. If less than maximum retention and resistance are needed.
3.If objectives can be met with a more conservative restoration.

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12
Q

PROS CVC

A

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

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13
Q

CONS

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 perform electric vitality testing of an abutment tooth.
 Patients may object to the display of metal associated with complete cast crowns.

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14
Q

chamfer

A

a finish line design for tooth preparation in which the

gingival aspect meets the external axial surface at an obtuse angle.

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15
Q

finish line

A

the terminal portion of the prepared tooth.

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16
Q

axial inclination

A

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

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17
Q

convergence angle

A

the taper of a crown preparation, the angle, measured in degrees, formed between opposing axial walls.

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18
Q

Convergence angle

A

The angle or taper formed by opposing axial walls

 Recommended range 2°–10°  Ideal 6 ° to optimize retention

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19
Q

path of placement or POW

A

the specific direction in which a prosthesis is placed on the abutment tooth or remove from it.

Should be nearly coincident with the tooth’s long axis

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20
Q

undercut

A

any irregularity in the wall of a prepared tooth that prevents the seating or removal of a casting - pretty much a wax casting gets deformed when removing it.

Opposing axial walls which do not converge occlusally

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21
Q

Sequence CVC

A 
 occlusal guide grooves
 occlusal reduction
 axial guide grooves
 axial reduction( Buccal and Lingual)  axial reduction (Interproximal)
 finishing and evaluation
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22
Q

CVC Dimensions

A

Central groove = 1 mm
Functional cusp = 1.5 mm
Non-functional cusp = 1 mm
Chamfer width = 0.5 mm

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23
Q

Occlusal Guide Grooves

A

242.6M diamond bur in high speed handpiece

 depth grooves are placed 0.2mm shallower than the intended tooth reduction to allow for smoothing

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24
Q

FUNCTIONAL cusp

A

 buccal cusp in mandibular arch

 lingual cusp in the maxillary arch

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25
242.6M and 747 diamonds 169L carbide
when moved parallel to the long axis of the tooth will create a tapered surface converging 3–4° from the cervical toward the occlusal
26
Axial guide grooves
place three shallow grooves in the buccal axial wall and three in the lingual axial wall with a 242.6M diamond  one groove in the center and one at each mesial and distal line angle  grooves determine the path of withdrawal of the restoration and should be in the long axis of the tooth
27
DISADVANTAGE chamfer
Care needed to avoid unsupported lip of enamel
28
ADVANTAGE chamfer
Distinct margin, adequate bulk, easier to control
29
Line angles
should be rounded axial wall line angle  occlusoaxial line angle  cavo-surface line angle
30
Excess reduction will occur if:
xcessive convergence angle  preparation does not follow tooth anatomy  POW diverges from long axis of the tooth  excessively wide chamfer (>0.5mm)  excessive gingival extension of preparation
31
Finishing***
 a polished surface is unacceptable
32
Evaluation:
``` functional cusp: 1.5mm  central groove: 1.0mm  non-functional cusp: 1.0mm  path of withdrawal: ±5°  convergence: 6°  chamfer width: 0.5mm  interproximal chamfer placement: 0.5mm interproximal clearance ``` linguo-occlusal line angle reduction: 0.8mm  margin smoothness  rounding of line angles  overall smoothness  margin placement: 0.5mm above plastic gingiva or 1.0mm coronal to CEJ (whichever is more coronal)
33
Adaptation
Degree of fit between prosthesis and supporting structures.
34
Axial inclination
long axis to plane (usually horizontal plane).
35
Axis of prep
Planned line or path of placement and removal for a dental restoration.
36
Bevel
slanting edge, slanting finish line and curve of tooth prep
37
butt
to bring any two flat-ended surfaces into contact without overlapping as in butt joint.
38
chamfer
finish line design for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle.
39
chamfer angle
angle between chamfered surface and one of the original surfaces from which the chamfer was cut.
40
complete crown
restoration that covers all the coronal tooth surfaces.
41
convergence angle
taper of a crown prep - angle formed between opposing axial walls.
42
divergence angle
the sum of the angles of taper of opposing walls of a tooth preparation that diverge away from each other.
43
Draw
the taper or convergence of walls of a prep for a restoration.
44
extracoronal retainer
part of fixed prosthesis uniting the abutment to the other elements of the prosthesis that surrounds all or part of the prepared crown.
45
interocclusal clearance
the arrangement in which the opposing occlusal surfaces may pass one another without any contact. Amount of reduction achieved during tooth preparation to provide for an adequate thickness of restorative material.
46
lingual inclination
deviation of the coronal portion of a tooth from the vertical plane toward the tongue.
47
margin
outer edge of a crown, inlay, onlay or other restoration.
48
path of placement
the specific direction in which a prosthesis is placed.
49
retention arm
an extension that is part of a removable dental prosthesis and is used to aid in the fixation of the prosthesis.
50
shoulder finish line
finish line design for tooth preparation in which the gingival floor meets the external axial surfaces at approximately a right angle.
51
undercut
below HOC
52
veneer
thin sheet of material usually used as a finish.
53
Sextant 1
9-12 o clock - maxillary right molars and premolars
54
Sextent 2
9-11 o clock incisors and canines maxillary
55
Sxtent 3
10-12 o clock left maxillary molars and premolars
56
Sextant 4
9-11 o clock left mandibular molars and premolars
57
Sextant 5
10-12 o clock mandibular incisors and canines
58
Sextant 6
9-11 o clock right mand molars and premolars
59
242.6M bur
0.8mm to 1.3 mm
60
747 bur
0.5,6-1
61
169 l bur
Head Diameter: 0.9 Tip Diameter: 0.5

Fixed 1 (7 decks)

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