Materials profile Flashcards
criteria for selecting a materials
analysis of material
consideration of the requirements
consideration of available materials and properties
choice of material
materials
metals glasses ceramics plastics/polymers composites
metal properties
strong
malleauble
conduct heat and electric
shiny
glassess properteis
transparent
dont conduct heat
can be toughened
brittle
ceramics properties
white
brittle
dont condcut
dental materiasl
amalgam
alginate
porcelain
glass ionmers
amalgam
strong
silver
contains mercury
not sticky
alginate
impression taking
sets quickly
moulds to teeth well
porcelain
used for crowns
white
strong
glass ionomers
temporary fillings
aesthetic
sticky
why do we restore teeth
trauma
tooth dacy
tooth loss
revision
direct restorative materials
dental amalgam glass ionomer cements resin modified glass ionomer cements resin composites polyacid modified resin composites
properties wanted from a dentist
command set simple bulk placement technique easy to detect recurrent caries cost
properties wanted from patient
safe restore fill function aethetic result function indefinitely cost
indirect restorative material types
removable -full/partial dentures fixed - metal crowns bridges inlays ceramic veneers crowns and inlays metal ceramic crowns and bridges
indirect material requirements
fit for purpose -(each patient is different easy to handle, appropriate properties, aesthetics) clinically efficacious safe
how to know if a material is safe
CE mark
safety testing procedures
basic research
clinical research
basic research for CE
pre market testing
required by law for testing
exact tests determined by evaluation of risk associated with material and clinical appliation
clinical research
post market surveillance
what is included in premarket testing
in vitro
in vivo testing
invitro testing
cytotoxicity (killing cells)
genotoxocity (damage genes)
oestrogenicity (effect on oestrogen cycle)
microbial test
what is the microbial test
how quick does fungus grow on the material
in vivo testing
implantation tests in animlas
- looks for systemic toxicity
evaluation of sensitisation and irritation
pulp studies
types of adverse reationc
toxic reactions irritant contact dermatitis allergic contact dermititus mal lichenoid reactions anaphylactoid reactions contact urticatria intolerance reactions
what is included within irritant contact dermatitis
acute toxic reaction
cumulative insult dermatitis
paraesthesia
what is oral lichenoid reactions
white spots around the mouth
what is the post surveillance for
adverse reaction unit
collects data
most common allergens
nickel(25%) palladium chromium cobalt stannum
