misc Flashcards
what should be removed before a new RPD
tori
exotoses
sharp mylohyoid ridhes
epulis fissarium
denture stomatitis
localized or generalized inflam of denture bearing area
presentation denture stomatitis
redness and buring area with or without discomfort
most likely cause of denture stomatits
trauma with secondary fungal infection
tx of stomatitis
improved OH
tissue rest
nystatin
resilient conditioners
new better fitting RPD
acute atrophic candidasis present as:
red atrphic patch or erythmatous and painful mucosa
common form of? symptoms ?
antibiotic sore mouth
common form of atrpophic candidasis
* oral burning
* bad taste
* sore throat with broad spec abx
what can also lead to atrophic candidasis
Fe anemia
chronic atrophic candidasis includes:
denture stomatitis
pap hyperplasia found where
palate
pap hyper causes
local irritation to poor fitting denture
poor OH
leaving in 24 hrs
tx pap hyper
educate on OH
adivse denture out at night
soak 30 min in 1% sodium hypochlorite
tissue conditioner
brush area lightly with soft brush
epulis fissuratum
inflam fibrous hyperplasia adj to border
cause epulis fiss
over extended or ill fitting flange due to long term neglect, resorption, traumatic occ via natural teeth
tx epulis
surgical removal
hyper tissue and new RPDS
must be removed prior to construction
tx hyper tissue
tissue rest
soft reline
change in habits
surgery
impression with hyper tissue
capture in passive state
why remove hyper before new RPD
provode RPD with a firm, stable base
kellys combo
refers to specific pattern bone resorb in ant maxilla due to CD opposed by man RPD
lose of support in combo
both max and man are resorbed (opposite directions)
combo occ forces focused where?
in ant sextants
result combo syndrome
tipping of occ plane
combating combo syndrome
continous reline or implant placement in posterior, helps to stabilize the occ plane with more equitable force distrib
tissue conditioners
soft materials applied to intaglio to allow better force distrib
used to tx unhealthy/abused tissues
tissue conditioner state
soft/deformable,
tissue conditioner duration
about 1 week, replace every 3-5 days
will bcome solid after this and become irritant themself
tissue conditioner composed of:
powder (acrylic monomer) and liquid (ethyl alc and aromatic ester) mixed to form a gel
mechanism of how cond works
distrib forces and acts as a cushion
when to apply tissue cond
intaglio checked with PIP, occ refined then cond placed
how to keep cond off cameo
seperator applied
distribution of cond
even layer added to intaglio with spatula
seating RPD with cond in mouth
light finger pressure, maintain as material flows
border tissues manipulated to mold conditioner
when using conditioner, if post artificial teeth present pt must:
must close teeth together while material still flowing to establish proper occ
once cond seated and aligned pt must:
sit 4-5 min
when RPD with cond out of mouth ot should:
submerge in cleansing solution or water, do not allow it to dry
how is WW fabricated
drawing the metal from which its made into a wire
allows?
elong % of WW
more than 6, allows clasps to bend
WW vs cast metal
CM is any metal that is melted and cast into a mold
when casting s cold worked to provide req article it is wroght metal
mechanical properties of WW are superior to CM
WW has ____% greater strength, hardness, tensile strength then the cast alloy it was made from
25
ww flex, adjustability, toughness and ductility
better than CM
success of WW clasps depends on
physical properties and changes that can occur in fab
how can WW properties be compromised by the lab
improper heating and cooling
too much heat and WW
can cause recrystalizaton or grain growth= least desireable occurance WW
Cr-Co popularity due to:
low density/weight
stiffness
low cost
tarnish resistant
Co-Cr alloys comapred to gold/palladium alloys
more rigid
compostion for Co-Cr alloys
cobalt, chromium, nickel, carbon
cobalt in the alloy property
strength, rigidness and hardness
chromium in alloy allows:
corrosion and tarnish resistance
nickel in alloys allows
ductility
gold alloy flex?
approx 2x Co-Cr
Co-Cr advantages
stiff
low cost
low weight/density
possible cause of failure in Co-Cr alloys
cold working
shrinkage porosity
low % elongation
excessive C in alloy
