308 - support during stages of prosthetic treatments. Flashcards
what is prosthodontics?
restoration or replacement of damaged or missing teeth using artificially constructed devices
what can missing teeth be replaced by?
dentures
implants
bridges
who creates fixed or removable prosthesis?
dental technician
what is an opposing arch?
the arch that doesn’t contain tooth to be resotred/replaced
what does edentulous mean?
no teeth present
what material is irreversible hydrocolloids?
alginate
what material is addtion siliciones and vinyl polysiloxanes?
elastomer
(heavy bodied putty - light bodied paste)
what material is polyether?
elastomer
what is alginate used for?
opposing arch
models for full/partial denture
models for removable ortho appliances
study models
models for special trays, bleachign trays, retainers
can alginate be used for the working model for crowns/bridges/veneers/inlays?
NO
what temperature should water be to mix alginate?
room temperature
what proportion is needed to mix alginate?
1:1
powder to water
what does alginate mix need to be free of?
air bubbles
what should alginate be wrapped in if it can’t be casted immediately?
damp gauze and sealed in airtight bag
what happens to alginate if it is left immersed in water?
impression expands
what happens to alginate if it is allowed to dry out?
impression shrinks
what is addition silicone elastomer used for?
fixed prosthetic work as it is highly accurate
what is the setting time for silicones?
4 minutes
what are the advantages of silicone elastomer material?
dimensionally stable in presence of moisture
excellent elasticity, strength and accuracy
what are the disadvantages of silicone elastomer material?
more complicated/time consuming than alginate
more expensive
longer setting time - uncomfortable for patient
what are polyethers used for?
fixed prosthetic work and some removable prosthetic work
what is the correct disinfection technique of impressions?
run under cold water to remove visible debris
immersed into disinfectant bath (10 MIN)
rinsed under cold water again
what is the solution for disinfecting impressions?
10% sodium hypochlorite
how long should impressions be immersed in the disinfectant bath?
up to 10 minutes
what to do with alginate impressions after disinfection?
cover with wet gauze and seal in airtight bag
what to do with elastomer impressions after disinfection?
blow dry with 3 in 1 syringe and seal in airtight bag
what does a working lab ticket need to include?
dentist
patient name
prosthesis to be constructed
material to use
shade
date of delivery for fit
disinfection details
what is an impression tray made by the technician called?
special tray
what is a special tray?
custom made and individual to patient
what does a triple tray record?
partial section of both arches and occlusion
what is a fixed prosthesis?
restorations or replacements cemented within or onto a tooth
what is a crown?
a cap covering 3/4 to whole surface of a tooth
what is a bridge?
two or more crown like units joined together as single device to replace missing tooth
what is a veneer?
facing made to fully cover labial surface of tooth
what is an inlay?
insert into tooth cavity
what is the purpose of a crown?
protect heavily filled or root filled tooth from fracturing
aesthetics
tooth shape change
what material can crowns be?
porcelain ceramic
all ceramic
precious metal alloy
non-precious metal alloy
what is the purpose of a bridge?
replace missing teeth
aesthetics
what material can bridges be?
all ceramic
bonded porcelain to metal
precious metal alloy
non-precious metal alloy
what is the purpose of a veneer?
aesthetics
what material can a veneer be?
porcelain
what is the purpose of an inlay?
restore cavity with material stronger than conventional filling material
what material can an inlay be?
all ceramic
precious metal alloy
non-precious metal alloy
what burs are used during a crown prep?
diamond tapered burs
what do diamond tapered burs do?
produce near-parallel sides for retention without undercuts
what is the use of a gingival retraction cord?
for accurate recordings of crown prep margins
what is a crown cemented with?
luting cement
what are the type of luting cements for crowns?
self-cure resin
light-cure resin
dual-cure resin
polyester resin
glass ionomer
zinc polycarboxylate
zinc phosphate
what is a porcelain jacket crown?
all-procelain crown for anterior teeth only
what is an all-ceramic crown?
stronger ceramic material
require less tooth removal
e.g. emax
what is a porcelain bonded crown?
substructure of metal for strength
buccal/labial face of porcelain for aesthetics
what is a full gold crown?
strongest crown
ideal for posterior teeth
not aesthetic
what is a post crown?
metallic post and core structure shaped to hold conventional crown
what type of post is screwed into the canal?
dentatus system
what type of post is cemented into the canal?
parapost system
compositpost system
why are temporary crowns used?
maintain appearance
prevent sensitivity of prepared teeth
maintain correct space between adjacent teeth
maintain correct occlusion
what is the hall technique?
cementation of preformed metal crown onto carious deciduous molar tooth
what is a pontic?
unit replacing missing tooth