custom trays for edentulous patients/edentulous anatomy Flashcards
with preliminary impressions and casts, you draw a line that marks the depth of the vestibulars and then another ____ mm up for both max and mand that represents the depth line
with mandibular custom tray, how far do you extend the depth line at the retromolar pads?
how far past the fovea palatine is the max tray?
2mm
with mand retromolar pads, depth line and depth of vestibule line are the same
1mm
crest of ridge and retromylohoid area
rugae and vertical undercuts
top is mand
bottom is max
what you put wax over(block out) to prevent displacement of tissue
the mucosa. highly keratinized, best denture support
masticatory
the mucosa. thin, non-keratinized mucosa of lips and cheek. forms seal against denture but does not resist stress
lining
the mucosa. dorsal surface of tongue. is keratinized, contains taste buds
specialized
characteristics of ideal denture-bearing tissue
1
2
3
4
- firmly bounded, keratinized masticatory muscle
- zone of connective tissue and submucosa
- underlying cortical bone
- muscle attachments nearby (enhance resistance to bone)
routine resoprtion pattern following extraction of teeth results in a SMALLER MAXILLA when compared to dentate arch
centripetal resorption
-contains no muscle fibers
-inserts in vertical direction
-little lateral movement in function
-notch in denture should be NARROW
labial frenum
space between labial frenum and buccal frenum
-reflection contains NO muscle fibers
labial vestibule
single or multiple
-ant-post direction of reflection
-contains FEW FIBERS
-notch in denture is BROAD since movement of frenum is affected by _____ and ____ muscles
buccal frenum
buccinator and orbicularis oris muscles
between buccal frenum and hamular notch
-spaces varies in size
buccal vestibule
the buccal vestibule MUST be filled vert and laterally by denture flange to prevent ingress of ____ and loss of _____ of max dentures
prevent ingress of air and loss of retention
another name for buccal vestibule
retrozygomatic space
palpate zygomatic process in buccal vestibule just buccal to first maxillary molar
-vestibular space posterior to zygoma
retrozygomatic space
commonly incompletely captured in preliminary impressions
-use synringe tech
retrozygomatic space
this area gives indication of width of space for flange
-lateral to tuberosity
coronoid process
list complete denture retention
1
2
3
4
5
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7
adhesion
cohesion
interfacial surface tension
intimate tissue contact
border seal- prevent ingress of air
-neuromuscular control by patient
narrow cleft between tuberosity and pterygoid hamulus
Denture MUST extend here
hamular notch (ptergomaxillary notch)
posterior border denture
-between bony tuberosity and hamulus
“soft displaceable tissue” for comfort and retention
hamular notch
coalescence of mucosa glands.
-one on each side of midline
-are in general area of vibrating line.
fovea palatini
midline palatine suture
median palatine raphe of hard palate
bony midline structure, no cushing effect
-may require relief when covered by denture
hard palate median palatine raphe
max secondary denture support area
-resists anterior displacement of denture
rugae
landmark for setting of anterior teeth
-pad of connective tissue overlying nasopalatine canal opening
incisive papilla (8-10mm teeth placed from papilla)
-ideal is MEDIUM DEPTH
with well defined rugae in anterior
(how tall ridge is in anterior)
palatal vault form
maxillary primary support area
horizontal anterior and posteriolateral hard palate
maxillary secondary support area
ridge crest
max mid line requires what while border is noncontributing to support
relief
the purpose is retention of maxillary complete denture
posterior palatal seal
FUNCTIONS of this: not purpose
1. border seal of max CD
2. compensates for dimensional changes in processed resin!!!!!!!
3. gives firm contact with tissues of soft palate while reducing gag
4. presses into tissue making posterior border less conspicuous to tongue
posterior palatal seal
house classification of soft palate.
> 5mm tissue available
ideal and Class 1
house classification of soft palate.
1-5 mm tissue available
adequate
class 2
house classification of soft palate.
<1mm of tissue
class 3 poor
house’s classification. (angle classification)
easiest to tolerate=
broadest range=
hardest to locate=
most common
easiest to locate=
hardest to tolerate=
easiest to tolerate= class 1
broadest range= class 1
hardest to locate= class 1
most common= class 2
easiest to locate= class 3
hardest to tolerate= class 3
may contain fibers which attach to “modiolus” a structure at corners of mouth where 8 muscles converge
buccal frenum
mand:
area posterior to buccal frenum
-primary support area for CD (mand)
-denture base should cover completely
buccal shelf
primary denture bearing area of mandibular denture
-between height of ridge and external oblique ridge
buccal shelf
secondary support area for mand dentures:
relief arreas
ridge crest and area of genial tubercles
relief area: lingal and labial ridge inclines
narrow ligamentous band extending from pterygoid hamulus to posterior part of mylohyoid line
-buccinator muscle and superior pharyngeal constrictor muscle fibers enter
-limits length of max and mand CDs
pterygomandibular raphe
-when prominent, can cause pain or loosening
-requires relief groove if prominent
-connects from hamulus to mylohyoid
pterygomandibular raphe
triangular pad of soft tissue at posterior end of mandibular residual ridge
-pear shaped pad
-created from scarring after extractions
retromolar pad
excessive resorption of residual ridge occurs of max if what is not covered
retromolar pad
-anterior attachment of tongue
-overlies genioglossus muscle
lingual frenum
-origin of mylohyoid muscle which influences length of lingual flange
-can be prominent and sharp requiring relief
mylohyoid ridge
space from lingual frenum to retromylohyoid curtain in posterior mand
alveololingual sulcus
-distal end of lingual sulcus
-area posterior to the mylohyoid muscle
-good seal aids in retention and stability
retromylohyoid space
denture flange adapts laterally close to body of mandible producing typical S CURVE
retromylohyoid fossa
mand secondary support area
-size decreases with time
residual ridge
residual ridge resorption-> blood supply interrupted->
bone resorption
