L3 CAD-CAM Flashcards
CAD
use of software to aid in the creation, modificiaton, analysis, or optimization of a design
universal software programs for CAD
not only for dental use (do not follow dental rules)
main advantage of universal CAD software
accepts complex cases and designs
main disadvantage of universal CAD software
takes logner and extra training to design a case
dental CAD software
only for dental use (follows dental rules)
main advantage of dental CAD software
faster / easier to design simple cases
main disadvantage of dental CAD software
do not accept complex cases and designs. could be limited depending on the software
closed system
-must work within a system
-accepts scans from one / limited type of scanner
-sends design to one / limited type of milling unit
main advantage of closed system
straightforward workflow
main disadvantage of closed system
limited
open system
-accepts scans from all other open systme scanners
-sends designs to all other open-system milling units or 3D printers
main advantage of open system
versatile
main disadvantage of open systm
complex workflow
CAM
the use of software and computer controlled machinery to automate a manufacturing process
most you can mill from chairside block
3 unit bridge
how many blocks can you mill chairside at a time?
one
chairside milling materials
PMMA
glass ceramics
zirconia
why use the smallest size that can mill your restoration?
lower cost
faster
less waste
wet milling
process uses a liquid coolant to remove excess material from the cutting tool and millingmaterial
wet milling materials
lithium disilicate
feldspathic porcelain
chrome cobalt
dry milling
machine uses pressurized air or a vacuum to eliminate excess material
dry milling materials
wax
acryllic
materials that can be milled wet and dry
zirconia
titanium
is it recommended to have a wet and dry milling machine in one?
no
3-axis milling
x-axis
y-axis
z-axis
4-axis milling
x-axis
y-axis
z-axis
a-axis (rotary movement around x-axis)
when is 4-axis milling helpful?
when holes and cut outs need to be mad ein the side of a piece or around a cyllinder
5-axis
x-axis
y-axis
z-axis
a-axis
b-axis (rotary movement around y-axis)
is 5-axis milling accurate?
no
main advantages of milling
- best accuracy
- variety of materials
- no polymerization shrinkage
- minimal post processing
- fastest
stereolithography (SLA)
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
digital light processing
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
material jetting (MJP, polyjet)
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
materials for 3D printing
resins mainly
metal printing is new and expensive
main advantages of 3D printing
cheap
minimal waste
complex geometries
getting faster, but not as fast as milling
main disadvantages of 3D printing
messy
weak materials
limited materials
low evidence
when to use 3D printed materials
try in
provisionals
guides
