FP - conventional bridgework Flashcards
what are the 5 components of conventional bridgework?
abutment
retainer
connector
pontic
saddle
what is the abutment in conventional bridgework?
the prepared tooth onto which the bridge fits
what is the retainer in conventional bridgework?
the indirect restoration for the abutment
what is the connector in conventional bridgework?
the part of the bridge which connects the retainer to the pontic
what is the pontic in conventional bridgework?
the prosthetic tooth/ teeth
what is the saddle in conventional bridgework?
the alveolar ridge after tooth loss
what are the 4 designs of conventional bridgework?
fixed-fixed
cantilever
fixed-moveable
complex
what are the advantages of fixed-fixed bridges?
longer span
pontic can support loading
what is the requirement for fixed-fixed bridge?
need teeth with the same long axis
describe a cantilever bridge?
simplest form of conventional bridgework
max 2 units
generally a mesial pontic
no loading in ICP or excursion on pontic
where are cantilever bridges better suited for?
posteriorly in the mouth
what is a spring cantilever bridge used for?
old fashioned
originally for spaced anterior dentition
what are fixed-moveable bridges used for?
mal-aligned teeth - long axes may very
what are the advantages of fixed-moveable bridges?
solution for alignment problems
good track record
cooperate physiological mesial drift
what are disadvantages of fixed-moveable bridges?
expensive
increased stress on major abutment
what is the risk of prepping for a fixed-fixed bridge on misaligned teeth?
pulp exposure
what must pontics fulfil the role of?
replacing function of lost tooth
achieve an aesthetic appearance
enable adequate OH
prevent tissue irrigation
what pontic design is used for anterior teeth?
modified ridge lap
what pontic design is used for posterior teeth?
modified ridge lap
what pontic design is a plaque trap?
saddle
ridge lap
what measurement should the clear space be for a wash-through hygienic pontic design?
2-3mm
what is the general pontic design of choice?
modified ridge lap
when doing palatal prep, what should be preserved where posibble?
cingulum
what are the methods available to assess undercuts in conventional fixed fixed bridge preps
direct monocular vision (not recommended)
indirect monocular vision
alginate impression and cast in quick setting plaster
paralleling mirror
describe parallelism in bridge preps
- use bur at same angle to survey teeth
- get birds eye view with front surface mirror
- angulation of mirror cant change from prep to prep to check all margins
- alginate imp and cast in plaster
