1 Flashcards
principles of surveying
- determine path of insertion
- identify wanted and unwanted undercuts
how to fit dentures in pt with undercuts
remove undercuts
What does mod mean
number of additional saddle areas
what teeth are not included in kennedy classification
third molars
what is craddocks classification about
load distribution: tooth/mucosa borne
3 points to look at for face form
temples
angles
zygomas
describe tapering form
- face form: temples widest, tapers in
- tooth: lean in towards root apex
- arch: tapers to a point at the front
describe square features
face: straight lines between temples,zygomas and angles
- tooth: sharp corners
- arch: non-rounded, sharp corners
describe oval features
face: widest at zygomas (in middle of face)
tooth: rounded
arch: rounded
what is angles classification related to
position of 1st molars in static occlusion
angles classification
1: max mesio-buccal cusp –> buccal fossa of mandibular 1st molar
2 div 1: max mesio-buccal cusp –> in between mandibular 5 and 6,/proclination of upper incisors
2 div 2: retroinclination of upper anteriors, bad lip support
3: mesio-buccal cusp between 1st and 2nd molars –> prominent chin, poss negative overjet, poor lip seal
function of bracing clasp arm
reciprocate retentive (active) clasp arm
when can a lingual bar not be used
too much recession
how is a spoon denture retained
adhesion and cohesion
how is a T denture retained
extended back to meet molars at gingival level
why do T dentures need metal bit at back of upper incisors
otherwise would interfere with lower incisors
what clasp must premolars and canines have and why
gingivally approaching. crown surface too big (molars better to clasp)
which teeth in denture base extended to and why
canines. big root surface –> indirect retention
what is a sanitary bridge
gap and bridge over it in dentures
order of things in surverying
measure undercuts –> tilt plate and lock
draw lines on cast
carbon mark undercuts (depth gauge)
mark undercuts
thickness of denture plate
0.4mm
when to use labial/buccal bar
too much lingual undercut
compare bar to plate
thicker but more soft tissue exposre –> less annoying to pt
function of parts of retentive clasp
- bracing arm and 2/3 of retentive clasp above survey line: BRACING (prevents lateral shifting)
- flexible clasp tips –> retention
how much of retentive clasp arm must enter undercut and why
DRAW DIAGRAM OF C CLASP AND PARTS’ FUNCTIONS (see sheet)
terminal 1/3 –> avoid traumatising tooth
