FIXED PROS Flashcards
name the different types of articulators
simple hinge (plane line)
average value (freeplane)
semi adjustable (denar/ denatus)
fully adjustable
at what point are occlusal relationships correct when using a simple hinge articulator?
when the casts are together
what can an average value articulator reproduce?
ICP
what is the arcon articulator?
denar semi adjustable
what is the non arcon articulator?
dentatus semi adjustable
where is the condyle located in a denar arcon articulator?
mandible
where is the condyle located in the dentatus non arcon articulator?
maxilla
what is a semi adjustable denar used for?
fixed pros
what is a semi adjustable dentatus used for?
removable pros
what are semi adjustable articulators used for?
multiple units
reorganised occlusion
group function
anterior guidance
occlusal analysis
what does a facebow record?
the relationship of the maxilla to the terminal hinge axis (position of the condyle)
what are the 4 components of a facebow?
bite fork - to record position of the teeth
bow - to record position of the condyle
jig - to link bow and bite fork
pointer - to align teeth to Frankfort plane
what is the frankfort plane?
inferior orbital rim -> EAM
for a facebow record, what is places on the bite fork?
warm wax
how are the position of the condyles located with a facebow?
ear axis
what point is drawn onto nose when using a facebow?
using incisal edge as reference
how is FWS measured?
rest position - OVD = FWS
what is retruded position?
when the condyle is in its most superior anterior position within the glenoid fossa
what is the median survival rate for resin retained bridges?
7 years 10 months
when would you consider fixed-moveable bridgework?
the long axis of each tooth is different and preparation would cause perforation
what are the methods to assess undercuts in conventional fixed-fixed preps?
direct monocular vision
indirect monocular vision
alginate impression and cast in quick setting plaster
paralleling mirror
what are the requirements for fixed-fixed bridgework?
teeth of the same long axis
when would you consider fixed-fixed bridge?
long span bridgework
pontic can support loading
how many units can a cantilever bridge be?
max 2
disadvantages of cantilever brudge?
no loading in ICP or excursion on pontic
what is the attachment in a fixed-moveable bridge called?
tube-lock precision attachment
disadvantages on fixed-moveable bridgework?
limited areas of use
complicated
expensive
increased stress on major abutment
how much clearance in there in a wash-through pontic from the gingiva?
2-3mm
why may you want a fixed solution instead of removable for missing teeth?
removable partial denture can affect the ecological situation in terms of plaque formation
what are the advantages of a
