Midterm1 : Dental Prostheses

Question 1

whats FDP

Answer 1

fixed dental prostheses;

• non removable tooth placement attached to natural teeth
• BRIDGE
• Fixed partial denture

(NOT individual crown)

Question 2

what are the 3 types of dentures?

Answer 2

• full dentures
• removable partial dentures (RDPs)
• stay plates (may be interim)

Question 3

what 3 things could fall under ‘implant supported prostheses’

Answer 3

• individual crowns ???
• bridge
• implant supported dentures

Question 4

whats a simple prostheses

Answer 4

• 1 or 2 missing teeth
• attached to two natural teeth
• full coverage restorations

Question 5

list of 5 non simple prostheses

Answer 5

• cantilever
• pier abutment
• maryland
• stress breakers
• multiple abutments

Question 6

what is an abutment tooth

Answer 6

prepared natural tooth , to which FDP is attached

Question 7

whats a retainer

Answer 7

the restoration over the prepared abutment teeth

Question 8

whats the tooth in the middle of a bridge called

Answer 8

pontic

Question 9

whats the saddle ridge lap shape

Answer 9

pontic has overhang contour of tooth on buccal and lingual

Question 10

whats the modified ridge lap shape

Answer 10

pontic has overhang on buccle/full contour but cut off on lingual

Question 11

whats the conical pontic shape

Answer 11

buccal is shaved down at gingiva and lingual slopse in towards gingiva- makes a cone shape from the m/d view

Question 12

whats the hygienic pontic shape

Answer 12

cut flat all across /room to see under

Question 13

whats the ovate pontic shape? when would it be used?

Answer 13

used with recent extraction

Question 14

whats the framework of a fixed prosthesis?

Answer 14

structural component without layered porcelain (metal or zirconia)

Question 15

cantalever

Answer 15

fdp with abutment on only 1 end

Question 16

which part of the mouth has a poor prognosis for fdp

Answer 16

posterior- poor prog in most cases

Question 17

whats a special anterior fdp case? whats its characteristics

Answer 17

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!

Question 18

what is a Pier Abutment?

Answer 18

abutment tooth with both adjacent teeth missing. could be single piece or two piece FDP

Question 19

what is a single piece pier abutment? and its characteristics

Answer 19

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

Question 20

what is a two piece FDP and its characteristics?

Answer 20

• 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..)

Question 21

what determines abutment teeth suitability?

Answer 21

• 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)

Question 22

what is Antes Law?

Answer 22

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!)

Question 23

what occurs if you violate antes law?

Answer 23

• torque on abutments
• fracture of porcelain veneers
• difficulty with retention and draw
• de-cementation
• inaccuracies in impressions

Question 24

what axis should path of draw be on

Answer 24

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.