RPD REVIEW

Question 1

what is the Kennedy classification based ?

Answer 1

frequency of observation in a patient population and suggested design principals.

Question 2

what are the steps involved with creating an RPD?

Answer 2

treatment plan
study casts- design RPD
final impressions, metal framework
fit frame, correct cast as needed, bite relation
SET TEETH
then wax try in?

Question 3

what dictates the path of insertion?

Answer 3

TEETH dictate this!

the parallelism of the teeth define the path

Question 4

what kind of stresses do the reciprocal arm resist?

Answer 4

lateral!!!!

the retentive arm resists vertical movement

Question 5

what kind of forces do guide planes have?

Answer 5

frictional to increase RPD retention!

helps control stresses and define the path of insertion

Question 6

what kind of clasp position is ideal for class III and IV?

Answer 6

Quadrilateral! all forces supported by abutment teeth

Question 7

what kind of clasp position is ideal for class II with no mods?

Answer 7

Tripod- good stress reducer.
with a class II, you are missing teeth on one side so you don't have the option to put in 4 stops!

Question 8

in what case would you have to resort to a bilateral clasp position?

Answer 8

Class I

worst stress reducer but unavoidable.

Question 9

what does the type of occlusion depend on?

Answer 9

opposing dentition

Question 10

describe the .01 undercut?

Answer 10

where horizontal disc meets the tooth surface and the barrel is tangent to the survey line
.01 undercut = retention

Question 11

if a third molar is missing and not to be replaced, what do you do!?

Answer 11

DO NOT CONSIDER IT IN THE CLASSIFICATION….

Question 12

what is a third molar is present,a and to be used in an abutment?

Answer 12

consider it for classification

Question 13

what if a second molar is missing, and not to be replaced?

Answer 13

NOT considered???

Question 14

what class does not allow for modifications?

Answer 14

class IV- because th most posterior tooth determines …

Question 15

what does length of span have to do with the edentulous area and force to abutment teeth?

Answer 15

the longer the edentulous span, the greater the force transmitted to abutment teeth

Question 16

what’s an ideal shape for the ridge?

Answer 16

inverted U.

knife edged or narrow is bad because of resorption

Question 17

should the clasp be active or passive when the RPD is fully seated?

Answer 17

PASSIVE

Question 18

what does clasp length have to do with stress?

Answer 18

longer = more flexible= less stress

Question 19

would metal to metal cause more or less friction than metal to enamel/porcelain?

Answer 19

MORE

Question 20

how far away should the borders of MCs be away from the gingival margins?

Answer 20

6 mm away and parallel to the gingival margins.

Question 21

what are two common types of palatal straps?

Answer 21

1 is the anterior/posposterior palatal strap major connector and 2 is the single palatal strap major connector.

Question 22

when might you want to use a n anterior/posterior palatal strap ?

Answer 22

small MX torus.

can use with ANY KENNEDY CLASS

Question 23

how wide should the posterior strap be for AP palatal strap?

Answer 23

8 mm wide, anterior to vibrating line.

Question 24

what classifications can you use a single palatal strap major connector?

Answer 24

bilateral tooth support- so class I, III, and III
preferred by patients over the AP strap.

Question 25

when might you use a full palate major connector?

Answer 25

situations where remaining abutment tooth on either side is a CANINE or 1st premolar.

Question 26

what is the least desirable of designs for palate?

Answer 26

Horseshoe- U shaped major connector
sometimes used with large inoperable torus.
CLASS IV

Question 27

what are the 2 types of mandibular major connectors?

Answer 27

lingual bar and linguoplate

Question 28

where should the linguoplate terminate?

Answer 28

do not extend this above the middle 1/3 of teeth

Question 29

what kinds of rests does the linguoplate have to have associated with it?

Answer 29

must have terminal occlusal rests or cingulum rests

Question 30

when would you especially want to use a linguoplate?

Answer 30

when there isn’t 7 mm of vertical height from FGM to floor of mouth!!!!!!
OR if you need to STABILIZE periodontally mobile teeth
provision for anticipated loss of teeth

Question 31

what do minor connectors link?

Answer 31

basically EVERYTHING!!!! connects the rests, guide plates, acrylic retention, and clasps to MC

Question 32

size of guide plane?

Answer 32

2-3 by 2-3

Question 33

what kind of forces do guide plates resist?

Answer 33

horizontal

Question 34

how deep should the deepest part of the rest be?

Answer 34

1. 5 mm

1. 0-1.2 at the marginal ridge