2 Flashcards
purpose of feldspar in dental porcelain
lowers the softening and fusion temperature of the glass
forms a solid mass around the other components
what ceramic crowns cant be etched to provide a better retentive surface and what is done instead
only ceramics containing silica can be etched (using hydrofluoric acid) (includes porcelain)
those without silica e.g zirconia cant be etched and should be air abraded instead to create a retentive surface
how does a silane coupling agent work
strong bond between oxide groups on porcelain surface and silane
other end of silane molecule has C=C bonds which reacts with composite resin luting agent
metal bonding agents how do they work
acidic end and C=C end
acidic end interacts with metal oxide
C=C end interacts with luting agent
name 4 key components of a randomised controlled trial
random allocation
blinding - both investigators and participants should be unaware of what treatment is being recieved
sample size - should be adequate
allocation concealment
value of no difference for risk ratios and risk differences
risk ratios = 1
risk differences = 0
what standards have been developed to improve reporting of RCT’s
CONSORT guidelines
name 5 questions you could ask a smoker
how many a day
what age did you start smoking
what products do you use
have you ever thought about quitting
have you tried quitting in the past
would you be interested in getting further help and support with quitting
definition of dependence
relying on and being controlled by - addiction
involves both physiological and psychological responses
name 2 evidence based treatments that may help a patient quit smoking
nicotine replacement therapies - patches, gums, sprays etc
varenicline (champix)
how does the british standards institute describe incisor classifications
describes them based on the lower incisor edges location in relation to the maxillary central incisor cingulum plateau
how can antero posterior relationship be investigated clinically
palapate the anterior concavities of the mandible and maxilla using middle and index finger
assess visually side on
what plane should be parallel with the floor when taking an OPT or lateral cephalogram
frankfort plane
what walls of the maxillary sinus can be reliably seen on a panoramic
medial and posterior
lateral and anterior cant be reliably seen
warfarin mechanism of action
inhibits synthesis of vit K dependent clotting factors
