Prosthodontics L7 - saddles, connectors and retainers Flashcards
low cost
easily modified
where life expectancy of denture short
if additions likely
where few reamining teeth
the points above describe which type of denture
Acrylic
strong rigid in thin section
less bulky
more hygienic if properyly designed
more expensive
difficult to add to
require a very accurate impression
the above points best descrivbe whch dentures
cobalt chromiun based dentures
the saddle of the denture has two functions, what are they
the part of the partial denture which carries the artificial teeth and replaces lost tissue
bounded saddles have abutment teeth at which side of the sadde
either end of the saddle
how many abutment tooths does a free end saddle have
there is a single abutment tooth at the mesial end of the saddle.
a tooth which the loss of will convert a bounded saddle into a free end saddle - is know as a what
critical abutment tooth
when designing a saddle what is the desired aim for the extensions
spread the load by covering the maximum amount of tissue as possible
a part of the partial denture which unites other components - is known as what
a connector
you can get major/minor connectors
a major connector unites partial denture saddles with what
a plate or bar
what is this
cobalt chromium lingual plate
what is this
dental bar
what is the desired tooth length to have an dental bar
9mm
what is this
what is the miniment requirement for the depth of lingual sulcus
what is the minimum requirement of gingival clearance
lingual bar
7 mm for the depth of the lingual sulcus
3.5 mm of the gingival clearance
what type of plate is this and under what conditions would it be used
this is a split lingual plate and would be used on patients who have gaps between their teeth, this plate prevents the metal from being visible
what is the name of this denture
swinglock denture
conectors that avoid gingival margin coverage are favoured. true or false
true
what type of denture is used for someone who has lost their anterior tooth through trauma and require a denture immediatley
spoon dendure is the most common. gingival margins free other than abutment teeth
more secure denture would be a t-denture
what design is this and what type of bar is this
horseshoe design
anterior palatal bar
what is the name of this bar
mid palatal bar
what is the typical width of a mid palatal bar
7 to 12 mm
name this type of bar design
posterior palatal bar
what would be required (in terms of coverage) when there is a free end and bounded saddle,
more extensive coverage
what are sectional maxillary dentures
these are small dentures where they replace anterior teeth, however do not replace posterior teeth.
patients prefer these because they are not bulky
the connecting component between the major connector or base of a partial denture and other units such as clasps and rests - what is being described
minor connector
where are the minor connectors located on this denture
why would you use a striking plate
striking plates are put in when the opposing teeth come in contact with the denture, causing it damage
HOW ARE DENTURES RETAINED BY SALIVA
physical forces created by a film of saliva between the denture base and mucous membrane
along with Physical forces created by a film of saliva between the denture base and mucous membrane how else are denrures retained
muscle activity of the lips, cheeks and tongue
which particular denture is heavily reliant on the retention by saliva and tissue support
partial upper spoon denture
what are direct retainers
direct retainers are clasps which engage the undercuts in teeth
what is the function of an undercut gauge
to measure the depth of undercut
occlusally approaching clasps are a more efficient bracing component, what is meant by brazing
the resistance of lateral movement of the denture
what force should a clasp exert when seated
the force must be passive and not exert any force on the tooth
the point of action for a clasp is located where
at the tip
a ring clasp is commonly used on critical abutment tooths.
how does this claps support the tooth
it supports the tooth by bracing, reciprication and retention
a cast cobalt chromium claps is extremely hard, strong and rigid material. it canbe incorporated in a CoCr casting of denture base. how much undercut depth can the clasp engage
0.25mm
wrought stainless steel clasp or more flexible than cast CoCr clasp.
how much undercut depth can wrought stainless steel engage
0.5mm
gold claps can engage undercut depths of ?
0.75mm
when would you use thermoplastic copolymer (dental d) clasps
teeth with deep undercuts
what is an RPI system
R = mesial rest
P = distal guiding plate
I = I shaped retentive clap (I bar)
used in a free end saddle situation
