Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
128 Cards in this Set
- Front
- Back
|
prosthesis that restores one or more, but not all natural teeth and is supported by natural teeth/mucosa
|
removable partial denture
|
|
|
tooth borne partial denture relies upon ____ for support
|
abiutment teeth only
|
|
|
mucosa-tooth borne pd depends upon ____for support
|
abut teteh, and mucosa of residual ridge/basal bone areas
|
|
|
a rigid extension of a PD, that prevents movement toward mucosa and transmit functional forces to teeth
|
rest
|
|
|
a rest is a _____ component of a partial denture that prevents movement toward_____, and transmits ______to _____.
|
rigid
mucosa functional forces teeth |
|
|
form of a rest on the opposite side of a fulcrum line, prevents distal extension area from lifting off too much and rotating out of the mouth
|
indirect retainer
|
|
|
an indirect retainer is a ____ that is posititoned ____an its' purpose is to _____.
|
rest
opposite of fulcrum line keep area from dislodging |
|
|
a rest opposite a distal extension (over a fulcrum line) is a direct/indirect retainer?
|
indirect
|
|
|
a clasp is a ___retainer
|
direct
|
|
|
a direct retainer is a ____
|
clasp
|
|
|
a ____is a component of a PD used to retain (prevent dislodge)
|
clasp or direct retainer
|
|
|
a clasp or direct retainer is a component of a PD that is used to____
|
retain/prevent dislodge
|
|
|
name all the types of direct retainter (clasp)
|
suprabulge
infrabulge wrought wire |
|
|
which of the 3 direct retainers (clasp) is the toughest/most flexible w/out fatigue?
|
wrought wire
|
|
|
joins components on one side of arch to those on the other
|
major connector
|
|
|
a major connector does...
|
joins components on one side of arch to the other
|
|
|
this type of major connector is wider side to side than a-p
|
palatal strap
|
|
|
this type of major connector is more square/ovoid, covers most of palate
|
maxillary palatal plate
|
|
|
this type of major connector feels more natural to the patient
|
maxillary a-p palatal strap
|
|
|
size of a maxillary a-p palatal strap is
|
nickel-dime sized
|
|
|
what is the last resort of a major connector, if a patient has a large, inoperable tori?
|
u-shaped palatal connector
|
|
|
what type of major connector would you use on the mandible that must be 4mm away from teeth?
|
lingual bar
|
|
|
what type of major connector would you use if there isn't a depth of vetibule 4mm away from teeth?
|
lingual plate
|
|
|
can you put a lingual plate on edentulous spaces?
|
NO
|
|
|
what type of major connector is used if lower teeth are angled toward the tongue, or if pt has mandibular tori?
|
labial bar
|
|
|
what is the difference between a labial and lingual bar, and what are they?
|
they are major connectors
labial is used if teeth have lingual angulation, or large mand tori. lingual bar is used most commonly, and muts be 4mm away from teeth |
|
|
what type of mandib major connector is used for periodontal patients or diastemas?
|
kennedy bar
|
|
|
this is used as a link between major connector or base and other units of prosth
|
minor connector
|
|
|
minor connector connects ____and ____
|
major connector or base and other units of prosth
|
|
|
this is a plate of metal in contact w/ proximal surface of abutment tooth, against a guiding plane
|
proximal plate
|
|
|
what is aproximal plate? plate of metal in contac w/ ____of____, and coincides with the _____
|
proximal surface
abutment tooth guiding plane |
|
|
denture base supports ____, replaces _____/_____. it is made of_____-
|
artificial dentition
gingiva/alveolar structure metal or acrylic |
|
|
9 reasons to use a RPD vs FPD
|
long edentulous area
restoration of hard and soft tissues inadequate perio support compromised abt teeth need for extension base cross-arch stability pt reasons for not FPD (x2) eas of plaque removal/cleaning |
|
|
8 applegate rules
|
1 - after extraction
2 - 3rd molar missing/won't be replaced, isn't considered 3 - 3rd molar present, its considered 4 - 2nd molar (same as 2 and 3) 5 - most posterior edent area used for classifying 6 - edentulous areas other than class are mods 7 - extent of mod is not considered, only # of spaces 8 - no modifications in kc4 |
|
|
a paralleling instrument, registers whether or not things are parallel?
|
surveyor
|
|
|
what is a surveyor?
|
a paralleling instrument - measures if things are parallel or not
|
|
|
procedure to analyze and delinieate contours of abut teeth/associated structures before making an RPD
|
surveying
|
|
|
surveying i sa procedure to analyze/delinieate contours of ____ and ____ before making an ____
|
abut teeth and assoc structures
an RPD |
|
|
6 purposes of surveying
|
1 - determine path of draw
2 - determine guide plane 3 - delineate H.O.C 4 - evaluate undercuts 5 - delinieate retentive areas 6 - tripod cast to permit reorientation |
|
|
2 relative orientationsof the path of draw?
|
parallel to long axis of tooth as possible
perpendicular to occlusal plane |
|
|
where is an undercut?
|
between h.o.c and gingival margin
|
|
|
tripod marks must depend on 4 things...
|
1 - vertical surfaces
2 - widely spread 3 - surveyor arm fixed 4 - cast is fixed |
|
|
effects of tilting a cast - 4
|
1 - align potential guiding plane areas = better path of draw
2 - redistribute undercut 3 - develop symmetrical gingival embrasure 4 - eliminate soft tissue interface |
|
|
rigid extension of a PD, contacts tooth in a prepared seat to transmit forces down long axis?
|
rest
|
|
|
3 functions of a rest
|
transmit functional forces down long axis of tooth
prevents force on mucosa indrect retainer |
|
|
@ the junciton of a rest/minor connector, the thickness of metal must be...
|
1.5mm
|
|
|
rests should be extnded as close to _____as possible, in order to____
|
center of tooth
prevent tippping |
|
|
internal line angles of rest seats should be (sharp/roudned)
|
rounded
|
|
|
occlusal rests outline are...
|
rounded triangular, w/ apex toward center of occ surface
|
|
|
what is the size of an occlusal rest?
|
1/3 of the f-l width, or 1/2 cusp to cusp
|
|
|
shape of the floor of an occlusal rest
|
spoon shaped
|
|
|
marginal ridge of an occlusal rest should be reduced....
|
1.5 mm
|
|
|
what type of angle connects the minor connector and the occlusal rest?
|
acute
|
|
|
interproximal occlusal rest
need a lingual extension for____ need a buccal extension for____ |
lingual - strength of minor connector
buccal - embrasure clasps |
|
|
Interproximal occlusal rest
need a ____extension for strength of minor connector need a ____extension for embrasure clasps |
lingual - strength of minor connector
buccal - embrasure clasps |
|
|
shape of a interproximal occlusal rest when viewed from the side?
|
U-shaped
|
|
|
T or F
cingulum rests are often found in mandibular anterior teeth |
F
|
|
|
T or F
cingulum rests are often found on maxillary anterior teeth |
T
|
|
|
what is the location (along the height of the tooth) of a cingulum rest?
|
junction of gingival/middle 1/3
|
|
|
incisal rests are used as (2 thiings)
|
auxillary rests
indirect retainers |
|
|
2 bad things about incisal rests
|
esthetics
mechanical leverage |
|
|
what type of rest is describe as a "little pothole"
|
marginal ridge
|
|
|
marginal ridge rests are common in...
|
anterior teeth (w/ marginal ridge access)
|
|
|
incisal rest must be ___wide and ___deep
|
2.5 mm wide
1.5 mm deep |
|
|
2 requirements of major connectors
|
rigidity
tissue preservation |
|
|
borders of maxillary major connectors must be ____from gingival margins
|
6mm
|
|
|
borders of maxillary major connectors must be 6mm from
|
gingival margins
|
|
|
If 6mm from gingival margins is not available, you must use a
|
metal plating
|
|
|
borders of maxillary major connectors should (pass through/go over) rugae when possible
|
pass through
|
|
|
metal of a maxillary major connector (should/shouldn't) be in intimate tissue contact
|
should be
EXCEPT where it corsses ging margin |
|
|
exposed borders of major connectors should be...
|
beaded
|
|
|
palatal strap's are usually for (tooth or tooth-mucosa) borne RPD?
|
tooth borne (KCIII)
|
|
|
drawback of a palatal strap?
|
strap is often flexible
|
|
|
anterior-Posterior dimension of a palatal strap/
|
8-12 mm
|
|
|
can a palatal strap be used for a tooth-mucosa borne rpd?
|
yes, if has a short extension base
|
|
|
What type of major connector can be used for Any kennedy class, is very versatile?
|
a-p palatal strap
|
|
|
what contributes to the increased rigidity of a a-p palatal strap?
|
straps in 2 planes - alv ridge nad palate
|
|
|
palatal plates are used for kennedy class____
|
I
|
|
|
what is a specific situation that calls for a u-shaped palatal connector?
|
large torus can't be removed LESS THAN 6mm FROM VIBRATING LINE
|
|
|
if you have a large torus on palate less than 6mm from vibrating line you would use a ____connector?
|
u-shaped palatal connector
|
|
|
Mandibular connectors must have sup borders ___mm from gingival margins
|
4mm
|
|
|
space needed to place a lingual bar (mandibular connector)
|
4 mm from gingiva, 4mm for the bar itself. so 8mm total
|
|
|
does mandibular lingual bar contact tissue?
|
NO
|
|
|
are mandibular lingual bars polished on tissue surface?
|
YES
|
|
|
cross section of lingual bar?
|
1/2 pear shaped
|
|
|
dimensions of a lingual bar
|
4mm sup-inf
2mm a-p |
|
|
when is a lingual plate indicated?
|
if less than 8mm from gingival margin to floor - tori/raised floor
OR if loss of teeth anticipated |
|
|
where does a lingual plate contact patient?
|
@ or above survey line - prevent food impaction
|
|
|
where does a lingual bar contact patient?
|
it doesnt
|
|
|
where are rests needed for a lingual plate
|
at each end
|
|
|
why is a labial bar less rigid?
|
its longer because it's outside the arch
|
|
|
why would you need a double lingual (kennedy) bar?
|
if direct retention needed from mandibular anteriors
large interproximal spaces present |
|
|
where is the 2ndary bar of a kennedy bar located?
|
between cingula and contact area (it's on the teeth)
|
|
|
how much space is needed between vertical components of adjacent minor connectors?
|
5mm
|
|
|
whats this
an extra coronal direct retainer, engages an abutment tooth for retention, stability and support of partial denture |
clasp
|
|
|
clasp
extra coronal ____retainer, that engages a ____ for ___, ____ and ____ of ____. |
direct retainer
engages an abutment tooth stability retention support of a partial denture |
|
|
3 components of a clasp unit
|
bracing arm
rest retentive clasp arm |
|
|
which part of the retentive component of a clasp engages an undercut?
|
terminal 1/3
|
|
|
are there any flexible parts of a pd?
|
only the terminal 1/3 of a retentive clasp arm
|
|
|
the bracing part of a clasp is the ___component
|
reciprocical
|
|
|
does a bracing arm go into an undercut?
|
no
|
|
|
6 requirements of a clasp
|
retention
bracing support reciprocation encirclement passivity |
|
|
what is this? what doe sit apply to? what is it provided by?
resistance to vertical dislogment |
retention
a requirement of a clasp terminal 1/3 of retentive clasp arm |
|
|
what is this? what doe sit apply to? what is it provided by?
resistance to horizontal forces, gives stability |
bracing
a requirement of clasp bracing clasp arm |
|
|
what is thicker, retenetive clasp arm or bracing clasp arm?
|
bracing
|
|
|
what is def of bracing?
|
resistance to horizontal forces
|
|
|
what is this? what doe sit apply to? what is it provided by?
|
requirement of clasp
|
|
|
what is this? what doe sit apply to? what is it provided by?
resistance to vertical seating forces preventing trauma to peridental structures |
requirement of clasp
support provided by REST |
|
|
what is this? what doe sit apply to? what is it provided by?
resistance to horizontal forces exerted by an active retentive element |
requirement of clasp
reciprocation the force is due to the retentive clasp arm upon INSERTION AND REMOVAL until it passes the H.O.C the BRACING ARM reciprocates the force |
|
|
what is this? what doe sit apply to? what is it provided by?
prevents horizontal tooth movement FROM within the clasp |
requirement of clasp
encirclement engagement of the clasp by more than 180 degrees |
|
|
what is this? what doe sit apply to? what is it provided by?
no active force on the tooth when clasp in place |
requirement of clasp
passivity only a force on the tooth if a dislodging force is applied |
|
|
definition of encirclement?
|
prevents horiz tooth movment from within the clasp
|
|
|
definition of passivity
|
no active force on the tooth when clasp is in place
|
|
|
definition of reciprocation
|
resistance to horizontal forces exerted on the tooth by the active retentive element
|
|
|
What is support?
|
resistance to vertical seating forces, prevents trauma to peridental structures,
|
|
|
what is bracing?
|
resistance to horizontal forces = STABILITY
|
|
|
what is another term for stabilty in relation to aclasp?
|
bracing
|
|
|
3 types of suprabulge clasps
|
circumferential
embrasure ring |
|
|
when is a ring suprabulge clasp used?
|
a tilted molar and MO rest
|
|
|
4 desgin considerations of an infrabulge clasp
|
never impinge on soft tissue
crosses ging margin @ 90 degrees proceeds 3mm before turning to framework never over deep undercut |
|
|
in relation to the buccal surface, where does an I-bar touch the tooth?
|
mid muccal or mesiobuccal
|
|
|
for how long (mm) does the i-bar contact the tooth?
|
starting @ .010 undercut, for 1.5 to 2.0 mm
|
|
|
when are wrought-wire clasps used?
|
tooth-mucosa borne RPDs
|
|
|
what gauge wire do you use for wrought wire clasp? is this thicker or thinner than usual
|
19 gauge
thinner |
|
|
what undercut is needed for wrought wire?
|
.020
|
|
|
what is an indirect retainer (clasp) give definition
|
component of RPD
assists direct retainers in preventing dis[placement of DISTAL EXTENSION functions thru LEVER ACTION |
|
|
fulcrum line passes through...
|
the RESTS!! not the teeth
|
|
|
where is the most effective indirect retainer?
|
on the longest perp line from the fulcrum line
|
