Midterm1 : Dental Prostheses Flashcards
whats FDP
fixed dental prostheses;
- non removable tooth placement attached to natural teeth
- BRIDGE
- Fixed partial denture
(NOT individual crown)
what are the 3 types of dentures?
- full dentures
- removable partial dentures (RDPs)
- stay plates (may be interim)
what 3 things could fall under ‘implant supported prostheses’
- individual crowns ???
- bridge
- implant supported dentures
whats a simple prostheses
- 1 or 2 missing teeth
- attached to two natural teeth
- full coverage restorations
list of 5 non simple prostheses
- cantilever
- pier abutment
- maryland
- stress breakers
- multiple abutments
what is an abutment tooth
prepared natural tooth , to which FDP is attached
whats a retainer
the restoration over the prepared abutment teeth
whats the tooth in the middle of a bridge called
pontic
whats the saddle ridge lap shape
pontic has overhang contour of tooth on buccal and lingual
whats the modified ridge lap shape
pontic has overhang on buccle/full contour but cut off on lingual
whats the conical pontic shape
buccal is shaved down at gingiva and lingual slopse in towards gingiva- makes a cone shape from the m/d view
whats the hygienic pontic shape
cut flat all across /room to see under
whats the ovate pontic shape? when would it be used?
used with recent extraction
whats the framework of a fixed prosthesis?
structural component without layered porcelain (metal or zirconia)
cantalever
fdp with abutment on only 1 end
which part of the mouth has a poor prognosis for fdp
posterior- poor prog in most cases
whats a special anterior fdp case? whats its characteristics
anterior cases are generally “special”? but especially; maxillary lateral incisor pontic, with canine abutment
- solid abutment but delicate pontic
- rotation is prevented by tongue and lips
- very GOOD prognosis!
what is a Pier Abutment?
abutment tooth with both adjacent teeth missing. could be single piece or two piece FDP
what is a single piece pier abutment? and its characteristics
a pier abutment type of fdp;
- doesnt violate antes law
- pier becomes fulcrum ?
- downward forces in posterior create unseating forces in anterior (of the denture) this causes frequent de-cementation
what is a two piece FDP and its characteristics?
- anterior segment cemented first (pier is part of it?)
- posterior segment cemented to abutment , resting in distal of pier
- pier no longer acts as fulcrum ! (why?)
- metal frameworks only !!!
(non rigid, stress relieving option..)
what determines abutment teeth suitability?
- periodontal siupport; length of roots, bone loss, crown to root ratio
- number of roots/divergence of roots (configuration)
- endodontic status (vitality test, apical lesions, adequacy of fill, over-instrumentation (loss of radicular dentin to files?), extent of preparation, appropriateness of posts
- root ORIENTATION (?)
- teeth being replaced (Antes Law)
what is Antes Law?
The peri-cemental surface area of the abutment teeth to be used for a fixed dental prosthesis must be equal to or exceed the peri-cemental surface area of the teeth being replaced
(ex; cant use 18 and 21 abutments for missing 19 and 20, but can use 18, 21 AND 22 as abutments for it!)
what occurs if you violate antes law?
- torque on abutments
- fracture of porcelain veneers
- difficulty with retention and draw
- de-cementation
- inaccuracies in impressions
what axis should path of draw be on
parallel to long axis of the tooth (make a parallel long axis, they dont actually have )
-average of the two long axis- this is the path of draw.
