L6: Lithium Disilicate

Question 1

Lithium disilcate dental restorations can be fabricated by…

Answer 1

milling and pressing

Question 2

What causes the pre-sintered lithium disilicate blocks to be purple or bleu?

Answer 2

added stain

Question 3

name of pre-sintered lithium disilicate

Answer 3

metasilicate

Question 4

why is pre-sintered (metasilicate) soft?

Answer 4

makes the block easier to mill while reducing the wear of the miling cutters

Question 5

according to ISO 6872.2015 classification of dental ceramics, lithium disilicate falls into which category?

Answer 5

class III

Question 6

which of the following is NOT an indication for lithium disilicate?

onlay/inlay
single unit anterior crown
posterior short span bridge
single unit posterior crown
posterior short-span bridge
veneers

Answer 6

posterior short span bridge

Question 7

the minimal occlusal reduction preparation requirement for a full coverage lithium disilicate crown?

Answer 7

1.5mm

Question 8

minimum axial reduction for full coverage lithium disilicate crown?

Answer 8

1.0 at gingival margin
1.5 axial reduction

Question 9

correct sequence of cementing a lithium disilicate restoration?

Answer 9

1. acid etching
2. rinsing the acid
3. applying silane coupling agent
4. using resin cement

Question 10

type and concentration of the acid used for etching lithium disilcate restorations

Answer 10

5% hydrofluoric acid

Question 11

(true or false) the silane coupling agent has a unique ability to bond organic tooth structure with inorganic ceramics

Answer 11

true

Question 12

(true or false) it is recommended to use a self- or dual-cure resin cement with lithium disilicate veneers

Answer 12

false

Question 13

the discoloraiton of dual cure resin cements is due to

Answer 13

tertiary amine

Question 14

the most common brand of lithium disilicate

Answer 14

e.max CAD