Denture teeth and soft linings Flashcards
what is tissue conditioner used for
temporary
applied to gain a more equal distributions of load and more normal mucosal position
when is tissue conditioner used
immediate denture after xLA
following infection of denture bearing area to adapt fit to healing tissues
what is functional impression material
applied to fit surface to allow for more definitive impression
what is a permanent resilient lining (soft lining)
applied as a ‘shock absorber’ to avoid pain from movement of denture upon nerves
what nerves may be relieved by soft lining
mental nerve with atrophic ridge
types of soft lining materials
acrylic polymers with solvent
acrylic polymers or co-polymers with an inert ester
silicones
what does an inert ester act as
a plasticiser
crucial features of tissue conditioners and functional impression materials
none irritant
non toxic
visco-elastic
2 presentations of tissue conditioners as functional impression materials
powder/ liquid
preformed sheets of acrylic gel
powder form of tissue condition and functional impression material
polyethyl methacrylate or co-polymer
liquid form of tissue conditioner as function impression materials
ethyl alcohol plus aromatic ester e.g., butyl phthaly glycolate
types of resilient linings
heat cured acrylics
self cured acrylics
heat cured silicone
self cured silicone
heat cured acrylic resilient lining
powder of higher methacrylates activated by benzoyl peroxide in liquid (containing monomer and plasticiser)
self cured acrylic resilient lining
powder of higher methacrylates activated by benzoyl peroxide from a tertiary amine
heat cured silicone resilient lining
processed against acrylic
contains a siloxane material and a filler of silica
self cured silicones
similar to impression materials for composition and setting
what are silicones susceptible to
candida albicans growth
thickness of a resilient liner
2-3mm
types of artificial teeth
acrylic
poreclain
how are acrylic teeth produced
dough moulding or injection moulding
how are acrylic teeth retained to denture base
chemical interaction
how are poreclain teeth produced
mould that are 30% larger than required as when fired shrink
how are poreclain teeth retained to denture base
mechanical retention via holes or pins
what noise to poreclain teeth produce
click on chewing and transmit greater load to denture bearing area
what teeth are more likely to suffer abrasion
acrylic
what teeth are more likely to chip and fracture
poreclain
what teeth have easier occlusal adjustment
acrylic
