midterm Flashcards
retention
resistance to displacement away from the teeth and soft tissues
*RPD parts: direct retainer, retentive clasp, indirect retainer, prox plates
support
resistance to displacement toward the teeth and soft tissues
*RPD parts: rests, major connect, bases
stability
resistance to displacement in a mediolateral or anteroposterior direction
*RPD parts: minor connect, prox plate, ling plate, denture base
how much will the tooth move under function of RPD?
0.2mm while the tissue is under compression will be compressed by 1.0-2.0mm
define bead line
a minor elevation at the border of the MX major connector which is intended to slightly displace the adjacent tissue and prevent food particles from getting under the framework (0.75-1mm wide)
name rests and the tooth they work on
1) occlusal -post molars and bicuspids
2) cingulum - MX cuspids and incisors
3) incisal rest - MN cuspids and incisors
4) ball rest - cuspids and incisors
5) channel -molars
alternative for rests on lingual of MN cuspids?
- bonded cast lingual rests
- bonded composite resin, then prep
- prep the rest, then place silver amalgam alloy
- ball rest, modified resin rest, incisal
what insturment determines the path of insertion for a RPD?
a dental surveyor
what is the ideal amount of undercut for a chrome cobalt retentive clasp?
0.010 INCHES
flexability of the clasp depends on what features?
- length
- taper
- curvature
- cross section form
- cross sectional diameter
- metallurgical characteristics of the alloy
reciprocal clasp in relation to survey line
reciprocal clasp must lie at or above the survey line
ring clasp vs modified ring clasp?
ring- will engage undercut in the Lingual of MN 2nd molar
modified- will engage the Mesial facial undercut
what are two major probs if you make a partial denture base out of metal withOUT acrylic resin?
- difficult to adjust
- you cannot reline a metal base
what is a RAP and when is it indicated?
is a reinforced acrylic pontic
*its a metal strut which will be cast as part of framework and will set the denture tooth
a tooth should be loaded in what direction for optimal health of the tooth?
axial direction
what are the 4 colors and what do they represent?
red- tooth modifications
blue- denture base boundary
black- tripod cast, survey lines
brown- metal framwork outline and placement
3 main parts of evidence based dentistry?
1) research
2) clinical experience
3) patients needs
path of insertion is dependent on what four factors?
1) guide planes
2) retentive undercuts
3) interference
4) esthetics
how far below the free gingival margin can we place the lingual bar?
3mm
how tall is the lingual bar?
5mm
in order to prevetn fracture of the the rest on the framework, how thick should the rest be over the margin?
1.0-1.5mm
physiologic adjustment?
chairside procedure and is accomplished only after the fit of the framework. Areas of binding are relieved and the pocess is repeated until the framework moves freely under moderately heavy pressure
tooth supported RPD vs tooth-Tissue RPD?
tooth- class 3 and 4; ONLY abutment teeth support RPD; fulcrums and levels NOT usually used in tooth
tissue- class 1, 2 and 4
MX vs MN major connectors
MX major connect- relief only at gingival margin, BEAD LINE, borders 6mm from margin
MN major connect- must be rigid, tissue relief required, NO beading, 8mm from floor of mouth and margin
Kennedy classifications?
1 - bilateral edentulous posterior
2 - UNIlateral edentulous posterior natural teeth
3 - UNIlateral edentulous area with natural teeth sandwhiching it
4 - single bilateral edentulous area ANTERIOR natural teeth
retentive clasp vs reciprocal clasp?
retentive- enters undercut
reciprocal- remains above height of contour (reciprocation: one part of restoration counter the effects created by another)
minor vs major connectors
major= joins the components from each half of arch minor= connecting link between major or base of RPD and other units (like clasp, rests, retainers, guides)
