Lab Manual 2; Anterior Metal-Ceramic Crown Preparation Flashcards
What is the width of the veneer recess shoulder for porcelain
1.2mm
How far lingual should the shoulder extend
1.0mm lingual to the contact area
There should be at least how much clearance between the preparation and the opposing teeth when the typodont is in the intercuspal position
1.0mm
Where is the location of the labial first plane
from the gingival crest to the junction of the incisal and middle 1/3
Where is the location of the labial second plane
from the junction of the incisal and middle 1/3 to the incisal 1/3 to the incisal edge
The labial first plane establishes what
the path of withdrawal for the crown and provides space for the veneering medium
The labial second plane is reduced to provide what
a uniform thickness of porcelain over the labial surface
Excessive angulation of the labial 2nd plane will result in what two things
over-reduction
thin incisal edge
The lingual contour is composed of what two components
convex (lingual first plane)
concave (lingual concavity)
Which surface does not contribute retention to the preparation
lingual concavity
What is a common clause of lack of retention and excessive tooth reduction
incorrect POW
