Prosthodontics studying

Question 1

what is a saddle

Answer 1

the edentulous space to be restored with a partial denture. It is the part of the denture which contains the artificial teeth

Question 2

Describe Kennedy Class I

Answer 2

bilateral free end saddles

Question 3

describe kennedy class II

Answer 3

unilateral free end saddle

Question 4

describe kennedy class III

Answer 4

single bounded saddle

Question 5

Describe kennedy class IV

Answer 5

anterior bounded saddle which crosses the midline

Question 6

when classifying saddles do you start posterior or anterior

Answer 6

posterior

Question 7

what is meant by support with regards to RPDs

Answer 7

support is the resistance of a denture to occlusally directed load

Question 8

what is Craddock Class I

Answer 8

tooth support - teeth provide a hard tissue resistance to occlusal loading

Question 9

what is Craddock Class II

Answer 9

mucosa support - a large coverage will provide a resistance to occlusal loading

Question 10

what is Cradock class III

Answer 10

tooth and mucosa - combination of hard tissue and large coverage when there are reduced number of teeth and large edentulous saddles

Question 11

what teeth are the best for providing support

Answer 11

those with the largest root area depending on the health of the PDL - a healthy tooth can potentially carry its own load plus one and a half similar teeth

Question 12

when providing rests, where should the load be transfered

Answer 12

down the long axis of the abutment tooth

Question 13

if providing mucosal support, how many mm at least should you place the base away from the gingival margin

Answer 13

base should be more than 3mm away from gingival margin as it will place pressure on the margin

Question 14

what components provide support?

Answer 14

• Rests provide support from vertical opposing forces

Question 15

what are the three types of rests

Answer 15

• occlusal
• cingulum
• incisal

Question 16

large or small rests - what are preferred

Answer 16

large - direct the force down long axis of tooth

Question 17

what technique is used to incorporate rests into the framework

Answer 17

lost wax technique

Question 18

what are consequences of preparing rest seats

Answer 18

• loss of occlusal stop when denture not worn
• destruction of tooth surface
• exposure of dentine

Question 19

What is retention (direct)

Answer 19

resistance to vertical displacement of denture

Question 20

what is indirect retention

Answer 20

the resistance to rotational displacement of a denture

Question 21

what components make up the stress relieving clasp system RPI

Answer 21

• mesial rest
• proximal guide plate
• gingivally approaching I-bar clasp