Introduction to Fixed Prosthodontics and Full Coverage Preparation

Question 1

indications for prosthodontics and full coverage preps

Answer 1

where there has been extensive coronal destruction

Question 2

caries (5)

Answer 2

trauma
previous restorations
endodontically related posterior teeth
where maximum retention and resistance form is needed
where axial and occlusal contours require substantial correction

Question 3

needed where…

Answer 3

axial and occlusal contours require substantial correction

Question 4

contraindications (2)

Answer 4

where a more conservative restoration can function (ie. partial veneer crown)
esthetics

Question 5

functional cusp bevel

Answer 5

1.5 mm tapers to 1.0 mm

Question 6

retention groove full depth of

Answer 6

170L bur

Question 7

morphologic occlusal reduction (3)

Answer 7

functional cusp: 1.5 mm
central fossa: 1.5 mm
nonfunctional cusp: 1.0 mm

Question 8

chamfer margin

Answer 8

0.5 mm

Question 9

axial reduction

Answer 9

0.5-1.0 mm

Question 10

Complete Metal Crown Preparation Sequence (5)

Answer 10

Occlusal reduction/Functional cusp bevel
Axial reduction
Proximal reduction
Secondary retentive features (if required)
Margination

Question 11

occlusal reduction (2)

Answer 11

depth orientation grooves

round end taper diamond

Question 12

depth cuts typically follow the

Answer 12

inclines of the tooth

Question 13

consider the planned

Answer 13

restoration

Question 14

complete metal crown (2)

Answer 14

1.5 mm clearance on functional cusps and central groove

1 mm reduction of non functional cusps

Question 15

Round-end taper diamond (3)

Answer 15

Completes occlusal reduction.
Re-aligns the functional cusps with the opposing
central groove.
Provides a uniform 1.5 mm occlusal clearance

Question 16

FACIAL AND LINGUAL AXIAL REDUCTION

adequate dimensions of reduction

Answer 16

0.5-1 mm

Question 17

parallelism- orientation of draw (5)

Answer 17

FL
MD
determine path of draw before starting axial wall preparation
consider the ideal orientation for each axial wall
ideal 6-10 taper too of opposing walls

Question 18

proximalaxial reduction (2)

Answer 18

needle chamfer diamond

small chamferdiamond

Question 19

margination finish lune

Answer 19

small chamfer tapered diamond

Question 20

verify path of draw with

Answer 20

direct handpiece

Question 21

visualize with

Answer 21

mouth mirror