Prosthodontics Flashcards
what is kennedy class I
bilateral free ended saddles posteriorly
what is kennedy class II
unilateral free ended saddle
what is kennedy class III
bounded saddle
what is kennedy class IV
anterior bounded saddle that crosses the midline
give four medical conditions that could make denture wearing harder
rheumatoid arthritis
xerostomia
osteoporosis/ bisphosphonates
neuromuscular problems
what should the nasio-labial angle be
90 degrees
name 4 tests you may want to carry out on a proposed abutment tooth
radiograph
EPT
thermal test
6PPC
what is meant by support of the denture
resistance to vertical movement of denture towards the tissue
what is meant by retention of the denture
resistance to displacement of the denture away from the tissue
what is meant by stability of a denture
resistance to horizontal/ lateral movement of the denture
what clinical mishaps can cause the registration to be inaccurate
not enough wax removed from saddle areas on the record block
too much interocclusal registration medium
what value is the fixed condylar articulator (average value) set at
30 degrees
what type of articulator would you be using if you have taken a facebow registration
semi-adjustable
either ARCON or non-ARCON
in what position are casts mounted
ICP
how is load transmitted when a denture is tooth supported
via the periodontal membrane
why is it inadvisable to place a denture base within 3mm of gingival margin
will place pressure at gingival margin
what do rests provide the denture
provide support from vertical opposing forces
what do clasps provide the denture
retention
name a procedure that can be done to the abutment teeth to increase direct retention
to add guide planes - parallel surfaces proximal to saddle area
what is indirect retention in a denture
resistance to rotational displacement of a denture
what is the RPI system
mesial rest
proximal guide plate
gingivally approaching I bar clasp
what can commonly be used to keep record blocks together
registration paste
what tool could you use to record the OVD
Willis Bite Gauge
how should an upper record block be adjusted so the occlusal plane is appropriately orientated
in line with remaining upper natural teeth
use ala-tragus line if edentulous upper
what is the ala-tragus line
from ala of the nose to tragus of the ear
how should the upper record block midline be decided
should be coincident with the facial midline
how should the incisal plane of an upper record block be recorded
by using the inter pupuillary line
what is the Fox’s occlusal guide plane a good tool to use for
to recreate occlusal and incisal planes on a record block when there are extended edentulous spaces
what 4 things should be checked on a record block where anterior teeth are missing
index teeth in occlusion
centre line
canine position
high smile line
name two materials that artificial teeth can be made out of
acrylic
porcelain
name three advantages of plastic acrylic teeth
natural appearance
silent during function
chemical bond with denture base
name three advantages of modified acrylic teeth
chemical bond with denture base
mechanical bond recommended too
higher abrasion resistance
name three advantages of porcelain teeth
silane coupling agent used to attach to denture base
natural appearance
hard - high resistance to abrasion
what are six things you should check after inserting a denture at delivery
fit
retention
stability
aesthetics
speech
occlusal contacts
how many times daily should denture cleanser be used
once daily
what are three things you should tell your denture patient on how to care for their dentures
clean dentures over filled sink
brush dentures with toothbrush and non-abrasive denture cream
only use denture cleansers outside the mouth
why should denture cleansing solutions containing sodium hypochlorite not be used for more than 10 minutes
could damage the denture
what should you avoid in a denture with a metal base
sodium hypochlorite cleaning solutions
name five effects if edentulism
loss of masticatory function
appearance
self esteem
quality of life
speech
what is post extraction absorption and when does it occur
occurs rapidly after extraction - in first 6 months
what are the 6 classes of atrophy in the mandible (Cawood and Howell)
stage 1 - pre-extraction
stage 2 - immediately after extraction
stage 3 - high-well rounded ridge
stage 4 - knife-edged shaped ridge
stage 5 - low well-rounded ridge
stage 6 - depressed bone level
name four reasons for rendering a patient edentulous
caries
periodontal disease
tooth wear
head and neck cancer pre-treatment
what are the three different methods of complete denture construction
conventional
replica
digital dentures
what is included in a denture history
age of current dentures
are they a matched set
most recent set worn
how many sets of dentures has the patient had
what two soft tissue diseases are often seen in denture wearers
angular cheilitis
denture stomatitis
what are the areas of support in the upper jaw
hard palate (primary)
ridge crest (secondary)
what are the areas of support in the lower jaw
buccal shelf and pear-shaped pad (primary)
ridge crest and genial tubercles (secondary)
what is the ideal value for free-way space
2-4mm
what are the seven steps to record occlusion in complete dentures
1 - adjust upper block for retention
2 - adjust upper block for tooth position
3 - adjust upper block for occlusal planes
4 - lower tooth position and horizontal jaw relationship
5 - measure vertical dimension
6 - record registration
7 - shade selection and mould
what is LIMBO
lip support
incisal edge
midline
buccal corridor
occlusal plane
what is the recommended nasio-labial angle
90 degrees
what can be used to check tooth position
alma gauge
how much incisal level should show at rest
1-2 mm
what occurs in a patient with excessive freeway space
overclosed facial appearance
cheek biting and TMJ problems
what occurs in patients with inadequate free way space
excessive load on denture bearing area
continuous muscular activity = pain
name 4 displacing forces of dentures
gravity
muscle activity
sticky foods
function
name factors that can affect the retention and stability of dentures
atrophic ridges
incomplete palates
mobile soft tissue (fibrous/ flabby ridge)
gagging patients
what do the three numbers on tooth mould selections reveal for anterior artificial teeth
top - width of 6 anterior teeth laid out flat
middle - width of left central incisor
bottom - length of left central incisor
what do the two numbers reveal on mould selection for posterior artificial teeth
top - width of 4 posterior teeth laid flat
bottom - depth of crown of left first molar
U = maxillary L = mandibular
how far anterior to the incisive papilla should anterior teeth be set
5.5mm
what is the occlusal plane parallel to
ala-tragus line
when should cuspless artificial posterior teeth be used
when it is difficult to get a reproducible jaw relationship
what is aspiration pneumonia and why is it associated with dentures
dentures are a reservoir for potential respiratory pathogens
increases risk of inhaling these pathogens
how should metal based dentures be cleaned
effervescent alkaline peroxide cleaners - steradent for 15 mins max
name some contraindications of immediate dentures
ORN/ MRONJ cases
pre-chemo or radiotherapy
dementia
