CAD/CAM Digital Dental Technologies Flashcards
(17 cards)
what are the types of CAD/CAM systems/
closed-architecture
open-architecture
selectively open-architecture
what is data acquisition?
using high-resolution scanners to capture 3D data of dental impressions, gypsum casts and intraoral tissues through intraoral scanning
what is data processing?
the virtual sculpting of dental restorations in CAD systems
what are some disadvantages of CNC milling for fixed restorations?
mainly for short-span restorations
tool wear and high maintenance cost
what is laser ablation technology?
uses laser energy to transform material by ejecting away from the block
what are the types of 3D printing for polymer-based?
SLA, DLP, SLS, Polyjet, Binder Jetting
what is the nm value that causes photopolymers to change their structure and chemical properties?
ultraviolet - 100-400 nm
visible light - 400-740 nm
what is stereolithography?
when layers of liquid photopolymer resin from a vat are selectively cured/ solidified in layer-by-layer using a UV laser scanner
what are some advantages of SLA?
prototypes and castables
good accuracy
good surface finish and details
machine with large build volume enables large parts
what are some disadvantages of SLA?
materials are expensive
build process is slow
only works with photopolymers
mechanical properties of parts are unstable over time
parts require post uv-curing and removal of supports
what is DLP?
resin 3D printing that uses a light projector to cure liquid resin one layer at a time
what is masked stereolithography
the same process as SLA but the light source is selectively covered or masked
what is material jetting?
when photopolymers are selectively squirted through multiple jet heads and cured by a UV light as each layer is deposited
what are some advantages of material jetting?
good accuracy
good surface finish
multi-material and multi-colour
supports can be built with different material and melted away
no post-curing required
what are some disadvantages of material jetting?
limited number of wax-like materials
fragile parts
slow build process
what is SLS?
employs semi-crystalline thermoplastic prepolymer which are preheated close to melting transition and above recrystallisation temperature and are sintered from a CO2 laser to fuse together
what are some areas that digital dentistry can be used in?
removable prosthodontics - removable dentures
fixed prosthodontics - crown, bridge
orthodontics - Invisalign
maxillofacial prosthetics - facial reconstruction
