Bridgework 1 Flashcards
why do we treat tooth loss
aesthetics
function
speech
maintenance of dental health
what are the options for tooth replacement
denture
bridge
implant
what is a bridge
a prosthesis which replaces a missing tooth or teeth and is attached to one or more natural teeth
what are the indications for bridgework
function and stability
appearance
speech
psychological reasons
systemic disease
co-operative patient
big teeth
heavily restored teeth
favourable abutment angulations
favourable occlusions
what are the contra-indications for bridgework
uncooperative patient
medical history
poor OH
high caries rate
periodontal disease
large pulps
high possibility of further tooth loss within arch
prognosis of abutment poor
length of span too great
ridge form and tissue loss
tilting and rotation of teeth
degree of rotation
periapical status
periodontal status
what is an abutment
tooth which serves as an attachment for a bridge
what is a pontic
artificial tooth which is suspended from abutment teeth
what is a retainer
extracoronal or intracoronal restorations that are connected to the pontic and cemented to the prepared abutment teeth
what are connectors
component which connects the pontic to the retainers
what is edentulous span
space between natural teeth that is to be filled by a bridge or partial denture
what is a saddle
area of edentulous ridge over which the pontic will lie
what is a pier
abutment tooth which stands between and is supporting two pontics
what is a unit
either retainer or pontic
what are the different types of conventional bridge prep
fixed-fixed
fixed cantilever
fixed moveable
what are the two main bridge types
conventional bridge
resin retained bridge
what is a hybrid bridge
fixed retainer and adhesive retainer
when is direct resin bonded bridgework used
in emergency situations
tooth needs to be extracted
tooth lost traumatically
why do you need good palatal coverage on a resin bonded bridge
greater surface area means a greater bond
when would you use a cantilever bridge
anterior teeth
when would you use a fixed-fixed bridge
posterior
what does divergent guidance paths mean
on the pontic the occlusal force goes horizontal which means it goes into the abutment tooth (abutment tooth carries the occlusal force of the pontic)
if a tooth already has a composite in it but you want to make a bridge what should you do
consider replacement but might be fine to keep as composite bonds to composite
if a tooth already has an amalgam in it but you want to make a bridge what should you do
consider replacing
what is the general prep for a bridge
180 degree wrap around prep
rest seats for mechanical retention
proximal grooves
supragingival chamfer finish line
prep remain in enamel
what is anterior prep for a bridge
cantilever design so either no prep or minimal prep or heavier prep
what is minimal prep for a cantilever
occlusal contact reduction
cingulum undercut removal only
chamfer margin 0.5mm
what is heavy prep for a cantilever
0.5mm palatal reduction
cingulum rest
proximal grooves
chamfer margin 0.5mm
how do you temporise after prepping the tooth
consider RPD
if into dentine cover with DBA
what is the fitting surface of the retainer made of
cobalt chrome or nickel chromium alloy
what is the process of cementation for resin bonded bridge
rubber dam
etch abutment
apply panavia etch
put resin on wing and seat on abutment tooth
what do you do once you have cemented a bridge
check occlusion
demonstrate to the patient how to clean around and underneath the bridge
