RPD REVIEW Flashcards
what is the Kennedy classification based ?
frequency of observation in a patient population and suggested design principals.
what are the steps involved with creating an RPD?
treatment plan study casts- design RPD final impressions, metal framework fit frame, correct cast as needed, bite relation SET TEETH then wax try in?
what dictates the path of insertion?
TEETH dictate this!
the parallelism of the teeth define the path
what kind of stresses do the reciprocal arm resist?
lateral!!!!
the retentive arm resists vertical movement
what kind of forces do guide planes have?
frictional to increase RPD retention!
helps control stresses and define the path of insertion
what kind of clasp position is ideal for class III and IV?
Quadrilateral! all forces supported by abutment teeth
what kind of clasp position is ideal for class II with no mods?
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!
in what case would you have to resort to a bilateral clasp position?
Class I
worst stress reducer but unavoidable.
what does the type of occlusion depend on?
opposing dentition
describe the .01 undercut?
where horizontal disc meets the tooth surface and the barrel is tangent to the survey line
.01 undercut = retention
if a third molar is missing and not to be replaced, what do you do!?
DO NOT CONSIDER IT IN THE CLASSIFICATION….
what is a third molar is present,a and to be used in an abutment?
consider it for classification
what if a second molar is missing, and not to be replaced?
NOT considered???
what class does not allow for modifications?
class IV- because th most posterior tooth determines …
what does length of span have to do with the edentulous area and force to abutment teeth?
the longer the edentulous span, the greater the force transmitted to abutment teeth
what’s an ideal shape for the ridge?
inverted U.
knife edged or narrow is bad because of resorption
should the clasp be active or passive when the RPD is fully seated?
PASSIVE
what does clasp length have to do with stress?
longer = more flexible= less stress
would metal to metal cause more or less friction than metal to enamel/porcelain?
MORE
how far away should the borders of MCs be away from the gingival margins?
6 mm away and parallel to the gingival margins.
what are two common types of palatal straps?
1 is the anterior/posposterior palatal strap major connector and 2 is the single palatal strap major connector.
when might you want to use a n anterior/posterior palatal strap ?
small MX torus.
can use with ANY KENNEDY CLASS
how wide should the posterior strap be for AP palatal strap?
8 mm wide, anterior to vibrating line.
what classifications can you use a single palatal strap major connector?
bilateral tooth support- so class I, III, and III preferred by patients over the AP strap.
