2 inlays and onlays Flashcards
halitosis
oral bad bacterial smell on the mouth specially toung
why all ceramic restoration have superior esthetics?
due to lackof underlying metal with high translucency and tooth like
all ceramics made
inlays
onlys
veneers
full crown
what does the inlay substitutes?
the amalgam/gold/resin/composite
and eliminates potential polymarizaton-shrinkage-layering resin
how long does it last?
it shoes highlongevity up to 95% at 10 years in oral cavity
whats its indications
1 low caries teeth
2 high esthetic priority
3 most teeth structure is available
composite resin is compremozed
contraindecations
weakened tooth
poor plaque control
bruxisum
what is used as a materia for inlay/ onlay
ceramic for both
lethium disilicate onlay
why using onlay instead of resin composite?
higher esthetic
larger cavity size and complex cases
harder material
resin used material is glass and quartaz resin
ceramic onlay/inlay DISadvantages
wearand lutting agent
sensetive bonding technique
compare to cast inlay/metal its long turma marginal gaps is unknown
why its known in metal? more researches
why does ceramics create abrasive to opposing tooth?
higher hardness
inlays preperations
clear path and margin
avoid undercuts
caries removal.6mm
with existing restorations and caries what is the depth should be in outline?
about 1.8mm and less if there isnt any caries
proximal box
gingival floor 1mm wide
margins prep?
block out undercuts with glass inomer
occlusal clearance prep?
1.5-2 for onlays ?cuz inlays cups is excluded
1,5 to prevent fracture
finishing preparation?
inlays: 90 degre chamfer not beveled due the need of bulk ceramic prevent fracture
onlays:heavy chamfer margin ,rounded internal angles
casts and dies in fabricationg fixed must be:
1 reproduce all details free of voids
2free of defects
3 minor imperfiction is acceptable in certan locations
4adequate access to prepared margin
5 all tissue that is related to fixed should be reproduced
whereinlays can beb fabricated?
1 dirictly using chairside cad/cam technology
2 indirectly
what are the lab fabrications options?
1 firing using foil or refractory die
2 heat pressed glass ceramic with lost wax technique
3 milled from prefabricatedceramic blocks
lost wax techique for ceramic shares many preparation requirments with inlay preparation for what?
cast metal
what are the preperation that lost wax shares it with cast metal?
clearly defined margins
adaquate clearance
diverginf walls
inlay onlays can be fabricated from:
1 feldspathic porcelains
2 leucite reinforced
3 glass infiltrated ceramics
4 lithum disilicate -glass ceramic-more monolothic
phosphote bonded invesment material:
used to make refractory dies cuz its heat resistince
its filled withthe elastomers duplicating the die stone cast
heat pressed ceramic technique
1 wax build up
2 wax burnout
3ceramic ingot and alumina plunger placed in heated mold
4pressing under vacume pressure at 1185
5 crestelization
6 finally staining and glazing
what is phosphate bonded material
investment material
