Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
40 Cards in this Set
- Front
- Back
|
2 subcategories of ceramics
|
-non-crystalline ceramics (glass)
-crystalline ceramics |
|
|
non-crystalline ceramics:
types (4) |
-lithium disilicate
-feldspathic porcelain -aluminous porcelain -leucite reinforced porcelain |
|
|
Crystalline ceramics:
types (3) |
-alumina
-zirconia -spinell |
|
|
Glass:
chemical features (3) |
-SiO2
-brittle -dissolved by HF -transparent/lucent |
|
|
polycrystalling ceramics:
chemicals traits (3) |
-Al2O3, ZrO2, etc
-fracture resistant -insoluble -translucent - opaque |
|
|
Feldspathic porcelain:
aka contains use |
-glass
-leucite crystals for strength, but they are opaque -PFMs, veneers, copings |
|
|
aluminum oxide (3)
|
-"alumina"
-pure white -oldest crystalline material |
|
|
zirconium oxide (2)
|
-pure white (but can be mixed)
-very fracture resistant |
|
|
magnesium-aluminum oxide (2)
|
-weaker
-more translucent |
|
|
methods of making ceramic restorations
|
-fired. lots of shrinkage
-pressing. less shrinkage, better margins -milled. Cerec |
|
|
steps of cerec cementation (4)
|
1. HF etch
2. silane 3. adhesive 4. resin cement |
|
|
pressed ceramics:
lost wax tech |
-coping waxed
-invested -burned out -ceramic pressed -divested and fit |
|
|
pressed ceramic:
pro cement type |
-look better than PFM
-resin cement |
|
|
empress (2)
|
(pressed ceramic)
-looks best -need stump shade |
|
|
IPS ERIS:
chem trait used for (2) |
-lithium disilicate
-stronger but less translucent -used for short span bridges -max span 9mm post, 11m ant |
|
|
polycrystalline ceramic strength:
pressable ceramics alumina zirconia |
- less than 400mPa
- 400-700mPa - 550-1200mPa |
|
|
sintering (2)
|
-fusing of ceramic particles
-happens w/ polycrystalline ceramics |
|
|
dry sintering (2)
|
-heating powdered ceramic until they fuse where they are in contact, but don't actually melt ("green state"
-no dimensional change from particle state |
|
|
dense sintered (3)
|
-green state is heated until particles melt onto one another
-no empty space -20% shrinkage |
|
|
InCeram/WolCeram
|
-glass infiltrated ceramic
-glass is infused into dry sintered copings -good esthetics and marginal fit -fair fracture resistance |
|
|
ceram:
steps |
Cerem:
-slip applied manually to refractory die -fired on die -glass infused into dry-sintered coping |
|
|
WolCeram:
|
-slip applied electrostatically
-free standing coping fired -no dimensional change -glass infused into dry sintered coping |
|
|
InCeram/WolCeram:
can be made of (3) |
-spinell (not commonly used anymore because of fracturing)
-alumina -alumina/zirconia matrix |
|
|
Procera:
coping (3) prep |
dense sintered coping:
-alumina -alumina/zirconia -heavy chamfer |
|
|
Procera:
processing |
-impress, die
-die scanned by machine -tech designs crown -die oversized to compensate for shrinkage |
|
|
procera:
looks fracture resistance coping color |
-fairly aesthetic
-used for ant and premolar bridges (<12mm) -good -opaque and bright |
|
|
Cercon:
|
-zirconia
-similar to Procera -wax-up secured in metal framework -pattern dusted and scanned -zirconia is bar coded to be precise about shrinkage |
|
|
Cercon:
material fracture resistance coping color looks |
-dense sintered zirconia
-very good -bright and opaque -good, although must mask opaque coping |
|
|
Lava:
material flexural strength |
-dense sintered zirconia
-1200mPa |
|
|
Lava:
procedure (3) |
-models scanned by laser
-coping is computer generated -coping is 20% oversized (like Cercon) |
|
|
Lava:
margins color |
-excellent fit
-decent translucency |
|
|
IPS e.max Zir Press
|
-press to zirconium
-zirconium coping (short margin) is waxed and thenn porcelain is pressed -strength of zirconia, marginal fit of ceramics, cosmetics of feldpathic porcelain |
|
|
KaVo Everest (5)
|
-in lab CAD/CAM
-leucite reinforced glass -presintered zir -dense sintered zir -titanium |
|
|
what use for veneers
|
-Empress
-Finesse -Cerac 3D, Cerac InLab -Feldspathic porcelain |
|
|
Anterior crowns w/ low stress (3)
|
Pressed leucite glass: Empress, finesse
Milled leucite glass: CEREC InLab |
|
|
anterior crowns w/ high stress (4)
|
(aluminas and zirconias)
-Procera -Wolceram -CEREC InLab -Lava |
|
|
anterior, premolar bridges (4)
|
-IPS Eris
-Wolceram -CEREC InLab -Lava |
|
|
post crowns, bridges (5)
|
(all dense zirconia!)
-Cercon, Procera Zircon, Lava, CEREC InLab, KaVo Everest |
|
|
cementing all-ceramics:
glass ceramics (5) |
1. HF etch crown
2. Silane crown 3. Phos. etch tooth 4. Adhesive on tooth 5. Resin cement |
|
|
cementing all-ceramics:
Polycrystalline ceramics (3) |
(conventional techniques)
-ZnOP -Glass Ionomer -Resin cement |
