FP - basics of tooth prep

Question 1

list the extra-coronal indirect fixed prosthesis

Answer 1

crowns - full/partial coverage
veneers
onlays

Question 2

list the intra-coronal indirect fixed prosthesis

Answer 2

inlays
onlays

Question 3

what materials can be used for fixed prosthesis?

Answer 3

metal
ceramic bonded to metal
all ceramic
composite
acrylic (provisional)

Question 4

types of metals used for fixed prosthesis?

Answer 4

gold (precious metal alloys)
silver palladium
nickel chrome (non-precious metal alloy)

Question 5

what is an extra and intra coronal restoration bounded by?

Answer 5

proximal surface of adjacent teeth
occlusal surface of opposing tooth/ teeth
soft tissues bucally and lingually/ palatally

Question 6

list the 6 principles of preparation

Answer 6

1. conservation of tooth tissue
2. resistance form
3. retention form
4. structural durability
5. marginal integrity
6. preservation of periodontium

Question 7

what is retention form?

Answer 7

the ability of the preparation to retain a restoration in an occlusal direction

Question 8

what is resistance form?

Answer 8

the ability of the preparation to prevent dislodgement of a restoration to lateral and oblique forces

Question 9

what is a short, tapered prep susceptible to?

Answer 9

shearing forces due to less compression

Question 10

what is the ideal angle of taper?

Answer 10

6 degree
10-20 acceptable

Question 11

what may round preps and non full coverage preps require to help with retention?

Answer 11

grooves

Question 12

minimum width of section needed for metal?

Answer 12

0.5mm

Question 13

occlusal clearance required for metal?

Answer 13

1mm

Question 14

what type of finishing margin is required for metal?

Answer 14

any

Question 15

how deep a reduction is needed for ceramic bonded to metal?

Answer 15

0.5mm plus another 1mm for ceramic
1.5mmh

Question 16

how much occlusal reduction is required for ceramic bonded to metal?

Answer 16

1-2mm

Question 17

what type of finishing margin is required for ceramic bonded to metal?

Answer 17

shoulder margin for ceramic, chamfer for metal

Question 18

how much axial reduction is required for ceramic/ composite?

Answer 18

0.6-1mm

Question 19

how much occlusal reduction is required for ceramic/ composite?

Answer 19

1-1.5mm

Question 20

what type of finishing margin is required for ceramic/ composite?

Answer 20

chamfer finishing margin

Question 21

what bur is used for occlusal reduction, axial reduction, proximal reduction, and chamfer prep?

Answer 21

round (chamfer) ended tapered bur

Question 22

what type of bur is used for depth grooves and shoulder prep?

Answer 22

parallel sided flat ended

Question 23

what type of bur is used for groove/ box prep and shoulder?

Answer 23

flat ended, tapered

Question 24

what type of bur is used for initial proximal reduction?

Answer 24

long needle

Question 25

what type of bur is used for lingual/ palatal reduction?

Answer 25

rugby ball

Question 26

what type of bur is used for refinement of prep?

Answer 26

smooth (red band) round ended, tapered

Question 27

where should the finishing margin lie?

Answer 27

on sound tooth structure
below contact point
not subgingival
following contour of gingiva

Question 28

crown prep sequence?

Answer 28

1. occlusal reduction
2. axial reductions (IP, lingual/ palatal, buccal)
3. finish line
4. smoothing

Question 29

what cusp should be reduced?

Answer 29

functioning cusp
generally - P cusp of maxillary teeth and B cusp of mandibular teeth