Prosthodontics L1 - why partial dentures Flashcards
when would you need a partial denture
when there is some natural teeth in a jaw
when would you need complete full dentures
no natural teeth in a jaw
A prosthesis that replaces some teeth in a partially dentate arch. It can be removed from the mouth and replaced at will.
this statement describes what?
partial denture
partial dentures can be subdivided by the material they are made of. what are the two major types they are made of
PMMA and Cobalt/chromium
name this type of partial denture
PMMA Partial denture
name this type of partial denture
cobalt/chromium partial denture
what does PMMA stand for
polymethylmethacrylate
polymethylmethacrylate is commonly know as what
acrylic
why is there some form of weakness in this type of denture
this particular denture comprises of cobalt/chromium and PMMA. the PMMA teeth have to be bonded to it, and this causes a weakness.
weakness in materials = when one material has to be bonded to another.
there are many reasons as to why we make partial dentures, however what are the three main reasons they are made
appearance
speech
mastication
appearance in prosthodontics is sometimes refrred to as what?
Aesthetics
the tongue on the back of the teeth help with speech. which particular sounds does it help produce
and also which 3 letters does it help prounce
vowel sounds
F’s, V’s, and S’s
an upper and lower partial denture is required for this patient, for mastication as the primary reason, what other features will threse dentures improve
other features of improvement will be speech and appearance
sometimes when we make partial dentures for primary reasons, they can also have multitue improvements too.
how can you aquire a cleft palate if not congenitally
through cancer
if we have space around teeth, then the teeth qhich has aquired space will have some form of movement, they will do one of three things
what are these three type of movements
they will
overerupt
drift
tilt
what has occured to this lower molar
due to their not being an upper molar present, the lower molar has over erupted
what is occuring to right central incisor
the right central incisor is drifting towards the midline
this is image indicates one of the most common movements of teeth after an extraction, what is happening
the tooth are undergoing tilting
the molar is is tilting mesially and the premolar distally
how does partial dentures increase the risk of caries
it is said that the use of partial dentures increases plaque retention. thus increasing caries
what does rocking of the denture cause
causes gum recession or “stripping”
this image shows a particular area of the oral mucosa that is more red compared to other regions.
this particular area indicates where a denture was sitting, what is the name of this condition
denture stomatitis
denture stomatis is caused by a fungal infection. what is the name of the fungi responsible for this condition
Candida albicans
the wearing of an upper partial denture full time (whilst a sleep) will eventually result in which oral mucosal problem
denture stomatitis
why do partial dentures often result in increased plaque levels
partial dentures are regarded as a foreign body and usually there is an increased affinity to anything foreign.
which partial denture will cause more damage
the partial denture which has space between the lingual bar and the underlying gum will cause more damage. the space gives rise for debris to accumulate and cause damage over a oeriod time.
the partial denture where the lingual bar fits the underlying gum will be more secure and cause less damage
to prevent or minimise damage over a long period time it is essential that all dentures are well fitted.
when designing partial dentures, there will be different variations of designs due to many different teeth missing.
one of the main principles of design is you should avoid what?
avoid as much tissue coverage where possible.
which class has a bilateral free end saddle
class 1
which class has a unilateral free end saddle
class 2
which class has a single BOUNDED saddle not crossing the midline
class 3
which kennedy class has a single bounded saddle crossing the midline
class 4
what is the kennedy classification for this?
class 3
single bounded saddle not crossing the midline
what is the kennedy classification for this?
class 1
bilateral free end saddle
what is the kennedy classification for this?
class 2
unilateral free end saddle
which class is this
class 2 modification 1
class 2 = the most posterior side is a unilateral free end saddle
modification = an extra saddle is required
what classifcation is this
class 2 modification 2
class 2 = the most posterior side is a unilateral free end saddle
modification 2 = two additional saddles are required
what is the classification
class 3 modification 1
class 3 = single bonded saddle not crossing the midline
modification 1 = because an extra saddle is required
what is an index teeth?
an index tooth is where a natural tooth in one jaw has a contact with the opposing tooth in the other jaw in the intercuspal position.
what happens in the 2nd clinical visit
primary impresseions (aka 1st imps)
this is an upper impression taken.
what features is essential for you to capture during the upper arch
hard palate
soft palate
maxillary tuberosity
teeth
sulcus
this is a lower dental arch impression
what features is essential for you to capture during the lower arch
retro molar pads
lingual sulcus
buccal sulcus
external oblique ridge all natural teeth
what is the 1st laboratory stage after the 1st impresions have been made
making a cast out of plaster
during the laboratory stage 1, when a patient has minimal index.
the technitian will make the use of …………………… to measure the occlusion
record blocks
how do you decide wether you need to a 3rd clinical visit (occlusion visit)
if the cast can be articulated without the need for record blocks, does not require a occlusion visit.
the image indicates that this pateint would require an occlusion visit.
what occurs during laboratory stage 2
designing of the dentures
what is the kennedy class here
kennedy class 2 modification 1
