fixed pros

Question 1

what are 3 principles of tooth preparation?

Answer 1

Biologic, health of oral tissues
Mechanical, integrity and durability
esthetic, appearance

Question 2

considerations affecting future biological health

Answer 2

axial reduction
margins
occlusal considerations
preventing fractures

Question 3

mechanical 1

resistance form

Answer 3

magnitude and direction of dislodging forces
geometry of tooth prep
physical properties of luting agent

Question 4

mechanical 2

retention form

Answer 4

magnitude of dislodging forces
geometry of tooth prep
roughness of fitting surface of restoration
materials being cemented
film thickness of luting agent

Question 5

mechanical 3

Preventing deformation of the restoration

Answer 5

a. Alloy selection
b. Adequate tooth reduction
c. Margin design

Question 6

CVC Indications

Answer 6

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

Question 7

CVC contraindications

Answer 7

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

Question 8

Pros of CVC

Answer 8

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

Question 9

Cons CVC

Answer 9

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.

Question 10

Functional cusp bevel

Answer 10

A wide bevel placed on the FUNCTIONAL cusp
.8mm depth
buccal cusp in mandibular arch
lingual cusp in the maxillary arch
Ensures that correct contours of the final restoration can be re-established while providing adequate thickness of restorative materials.

Question 11

Chamfer: a finish line design for toothpreparation in which the gingival aspect meets the externalaxial surface at an obtuse angle

Answer 11

ADVANTAGE :Distinct margin, adequate bulk, easier to control

DISADVANTAGE : Care needed to avoid unsupported lip of enamel

Question 12

Resistance form

Answer 12

The characteristics of a tooth preparation which tend to prevent dislodgement by forces directed in an oblique or apical direction.