FP - RRB Flashcards
What is the timeline of resin retained bridges?
the rochette bridge
the maryland bridge
the resin retained bridge
describe the rochette bridge
resin retained bridge that relied on countersunk holes through the metal retainers to allow for mechanical retention for the resin
thickness is increased to maintain strength
what was the rochette bridge mainly used for?
temporary measures
prior to single tooth implants
what does evidence suggest a rochette bridge is better than?
removable partial acrylic prosthesis
describe the maryland bridge
inner surface of base metal alloy retainer is electrolytically etches in strong acid for micromechanical retention
thinner than rochette
describe a resin retained bridge
metal retainer is sandblasted with alumina particles of 50um diameter
Panavia resin is used to chemically and micromechanically bond to the metal retainer and etched enamel
Why is sandblasting the metal retainer of a RRB good?
quick and easy process
can be done after try-in stage
what are the properties of panavia (kuraray)?
dual cure
radio opaque
thin mixture
insoluble
phosphate monomer
what does the phosphate monomer in panavia allow for?
effective bonding to enamel, dentine and metal alloys
what are the requirements for a wing retainer?
must be rigid
fabricated from metal alloy or fibre impregnated resin
wing must fit closely to abutment tooth
porcelain fused onto metal
what are the indications for a RRB?
unrestored or minimally restored abutment teeth
sufficient good quality enamel on abutment tooth
sufficient interocclusal space
good alveolar bone shape
what can RRBs be used for to avoid what kennedy class denture?
attached to second premolar to complete shortened dental arch
avoid kennedy class 1 denture
when can RRBs be used for ortho?
in cases of hypodontia to create space for pontic
what are the designs of RRBs?
cantilever
fixed-fixed
hybrid
what design is best?
cantilever
