L3 CAD-CAM

Question 1

CAD

Answer 1

use of software to aid in the creation, modificiaton, analysis, or optimization of a design

Question 2

universal software programs for CAD

Answer 2

not only for dental use (do not follow dental rules)

Question 3

main advantage of universal CAD software

Answer 3

accepts complex cases and designs

Question 4

main disadvantage of universal CAD software

Answer 4

takes logner and extra training to design a case

Question 5

dental CAD software

Answer 5

only for dental use (follows dental rules)

Question 6

main advantage of dental CAD software

Answer 6

faster / easier to design simple cases

Question 7

main disadvantage of dental CAD software

Answer 7

do not accept complex cases and designs. could be limited depending on the software

Question 8

closed system

Answer 8

-must work within a system
-accepts scans from one / limited type of scanner
-sends design to one / limited type of milling unit

Question 9

main advantage of closed system

Answer 9

straightforward workflow

Question 10

main disadvantage of closed system

Answer 10

limited

Question 11

open system

Answer 11

-accepts scans from all other open systme scanners
-sends designs to all other open-system milling units or 3D printers

Question 12

main advantage of open system

Answer 12

versatile

Question 13

main disadvantage of open systm

Answer 13

complex workflow

Question 14

CAM

Answer 14

the use of software and computer controlled machinery to automate a manufacturing process

Question 15

most you can mill from chairside block

Answer 15

3 unit bridge

Question 16

how many blocks can you mill chairside at a time?

Answer 16

one

Question 17

chairside milling materials

Answer 17

PMMA
glass ceramics
zirconia

Question 18

why use the smallest size that can mill your restoration?

Answer 18

lower cost
faster
less waste

Question 19

wet milling

Answer 19

process uses a liquid coolant to remove excess material from the cutting tool and millingmaterial

Question 20

wet milling materials

Answer 20

lithium disilicate
feldspathic porcelain
chrome cobalt

Question 21

dry milling

Answer 21

machine uses pressurized air or a vacuum to eliminate excess material

Question 22

dry milling materials

Answer 22

wax
acryllic

Question 23

materials that can be milled wet and dry

Answer 23

zirconia
titanium

Question 24

is it recommended to have a wet and dry milling machine in one?

Answer 24

no

Question 25

3-axis milling

Answer 25

x-axis y-axis z-axis

Question 26

4-axis milling

Answer 26

x-axis y-axis z-axis a-axis (rotary movement around x-axis)

Question 27

when is 4-axis milling helpful?

Answer 27

when holes and cut outs need to be mad ein the side of a piece or around a cyllinder

Question 28

5-axis

Answer 28

x-axis y-axis z-axis a-axis b-axis (rotary movement around y-axis)

Question 29

is 5-axis milling accurate?

Answer 29

no

Question 30

main advantages of milling

Answer 30

1. best accuracy 2. variety of materials 3. no polymerization shrinkage 4. minimal post processing 5. fastest

Question 31

stereolithography (SLA)

Answer 31

the light source in laser SLA printers is a tiny pin dot of light. this pin dot reflects off a rotary mirror and into the resin to cure resin dot by dot

Question 32

digital light processing

Answer 32

similar to SLA with one difference - where SLA machines use a laser that traces a layer, a DLP machine uses projected light source to cure the entire layer at once layer by layer

Question 33

material jetting (MJP, polyjet)

Answer 33

similar to paper printer, but 3D. it jets resin matierals from tiny nozzles onto a build surface in rapid passes and instantly solidifies it with UV energy

Question 34

materials for 3D printing

Answer 34

resins mainly metal printing is new and expensive

Question 35

main advantages of 3D printing

Answer 35

cheap minimal waste complex geometries getting faster, but not as fast as milling

Question 36

main disadvantages of 3D printing

Answer 36

messy weak materials limited materials low evidence

Question 37

when to use 3D printed materials

Answer 37

try in provisionals guides