Gold and ceramic inlays

Question 1

history

Answer 1

1) gold has been used for millennia
2) 3000 BC
3) gold wires, bands, or straps to stabilize teeth

Question 2

advantages of gold

Answer 2

1) no fracture
2) lower hardness than enamel
3) noble
4) stronger and durable
5) indirect enables better contours
6) burnishable
7) expansion coefficient similar

Question 3

disadvantages of gold

Answer 3

1) esthetic objections
2) lab expense and material expense
3) multiple appointments are necessary
4) temporary restoration must be fabricated
5) high thermal conductivity
6) noble and cannot be bonded
- only luted
7) galvanic effect

Question 4

indications for gold

Answer 4

1) carious lesions
2) diastema
3) etc

Question 5

contraindications

Answer 5

1) poor oral hygiene
2) high caries rate
3) patient too young

Question 6

metallurgy

Answer 6

1) pure gold is too soft
2)alloys
- gold
- copper
- silvr
- palladium
- platinum
- sinc

Question 7

type I and II

Answer 7

1) soft

Question 8

type III

Answer 8

1) inlays, onlays

Question 9

type IV

Answer 9

1) bridges and PFM
2) it is hard to adapt margins and polish

Question 10

ductility

Answer 10

1) can be stretched

Question 11

malleable

Answer 11

2) can be pounded

Question 12

good for closing

Answer 12

1) diastemas and suberupted teeth
2) composite may cause a plaque trap and be weirdly shaped

Question 13

root concavities

Answer 13

1 )some teeth have them
2) hard to restore with matrix band
- material will squirt into the side of roo

Question 14

longevity over cost

Answer 14

1) 4.6% failure over composite

Question 15

draw

Answer 15

1) needs to be tapered
-3-5 degrees
- do not go beyond because retention decreases
2) need to see inner wall within the other wall

Question 16

burs

Answer 16

1) #271
2) rounded line angles

Question 17

concern with wide inlays

Answer 17

1) can fracture the remaining cusp
2) can wedge the cusp apart

Question 18

maximum width

Answer 18

1) 1/3 intercuspal distance
2) 1.5 mm pulpal depth
3) use hatchet sparingly to prevent undercuts
4) flare with bur or GVE
5) make sure all margins connect smoothly
- including all bevels

Question 19

why bevel?

Answer 19

1) allows burnishing and smaller gap between crown and tooth

Question 20

mesial part of dovetail and axial wall

Answer 20

1) make sure there is no undercut

Question 21

occlusal bevels

Answer 21

1) may be better for teeth with flat occlusal anatomy
2) football diamond or carbide

Question 22

ceramic inlay prep

Answer 22

1) 2 mm pulpal depth
2) 2 mm isthmus
3) must provide thickness for material
4) slightly more 5 degree taper
5) all line angles rounded
6) no bevels
- 90 degree butt joints
7) 0.5 proximal clearance

Question 23

advantages of ceramic

Answer 23

1) more wear resistant
2) reduce shrinkage
3) better contours

Question 24

disadvantages of ceramic

Answer 24

1) harder, expensive
2) more time
3) wear on opposing teeth

Question 25

ceramic indications

Answer 25

esthetic areas, large preps

Question 26

ceramic contraindications

Answer 26

heavy occlusion, unable to maintain dry field

Question 27

4 MO

Answer 27

1) 1.5-2 mm pulpal
2) 2 mm isthmus
3) 10-12 degrees total taper
4) axial wall 1-1.5
5) rounded line angles
6) butt joints, no bevels
7) 0.6 mm clearance
8) smooth margins