Conventional Bridgework Flashcards
what is the abutment, retainer, connector, pontic & saddle?
abutment = prepped teeth where bridge fits onto
retainer = indirect restoratioin for the abutment
connector = part of the bridge which connects the retainer to the pontic
pontic = fake tooth
saddle = alveolar ridge after tooth loss
fixed-fixed bridge - what is the span and long axis? can the pontic support loading?
long span
abutments must be in same long axis
pontic can support loading
cantilever - how many units? position of pontic and reason? load on pontic in excursive/ICP movements?
no more than 2 units
mesial pontic - as less occlusald force in anterior region of mouth
no loading on pontic during excursive movements and ICP
what is a adv and disadv of fixed-moveable?
adv - stress breaking preventing unfavourable torque on retainers
disadv - increased stress on abutment tooth
fixed-moveable - when are they used? should male or female component be seated first? why is this? where should they be seated in relation to each other?
when teeth are malaligned and long axes of abutments varies
female seated first, male and pontic seated second - due to physiological mesial drift (male and pontic will drift mesially and lock into female)
female should be seated mesial to male
why should fixed-fixed not be seated on malaligned teeth?
risks pulpal exposure
what are pier abutments? why are they avoided? another name?
abutments in the middle of the bridge
sprung bridgework - middle abutment acts as a see-saw so retainer at one end can come loose (minor retainer likely to spring)
why is a saddle ridge lap avoided?
impossible to clean under
plaque can collect under
good lingual aesthetics are un-needed
what does dome design look like?
what does hygienic design look like?
clear space all the way through - allows for excellent gingival health
what is the design of choice? where does the saddle over lap? why is this good?
laps over only buccal side
inc clenasibility as lingual aspect free
how can you ensure prep is not undercut?
if margins can be seen all the way round in one view - using monocular vision (one eye), paralleling mirror, alginate impression and cast or by using bur as surveyor
