Quiz 1 Flashcards
Resistance to vertical displacement during function
Retention
Lateral resistance to displacement during function
Stability
Resistance to vertical forces of occlusion
Support
What three things/factors impact the forces
Type of mucosa
Bone Contours
Muscle attachment (Frenum, tongue)
Have 45 cm^2 of nerves that send signals to the brain per arch. Can withstand 44 pounds of force
Dentate patients
23 cm^2 for maxilla and 12 cm^2 for mandible. Can withstand 13-16 pounds of force
Edentulous
2 physical features for denture retention
Max extension of the denture base
Max intimate contact of the denture base with the basal seat (using muscles to help with retention)
Areas of the maxillary denture
Labial area with labial frenum (frenulum)
Incisive papilla
Buccal Frenum (frenulum)
Buccal area
Hamular notch
Fovea palatini
Tuberosity and distobuccal area
palatal area
A high frenum attachment is when the attachment is close to the
occlusal ridge
A low frenum attachment is when the frenum is close to the
vestibule
Dentures need to be contoured around the
Frenum
Frenums on the maxilla
Labial
Buccal (one on each side)
Any surface bound by teeth, alveolar bone, and tissues and the other side by lips or cheeks
Vestibule
Supports the denture and presents them from twisting
canine eminence
Pressure on this point causes disruption of blood flow and impingement of nerve
Incisive papilla
Provides support to horizontal movement, needs room for 2-3 mm of space
Tuberosity
Raised area around the incisive papilla
Rugae
Helps to resist the anterior displacement for dentures
Rugae
Cleft from the tuberosity to the pterygoid muscles at the back of the tuberosity
Hamular notch
Two small pits in the posterior of the palate
Fovea palatinae
Dentures will end near or within 2mm of this landmark
Fovea palatinae
Area with keratinized tissue that can take stress
zygomatico-alveolar crest
Zygomatico-alveolar crest is a __ area
stress bearing
Primary support area for the maxillary dentures
hard palate (consists of 2 plates)
A __ palate is not good for stability
high vault
This area of the palate usually needs relief to prevent soreness
Midline palatal suture
Medial to 3rd molars, relief is not usually needed
Greater palatine foramen
Mandibular areas of the denture (9)
Labial with labial frenum
Buccal frenum
buccal
Distobuccal
Distolingual
midlingual
sublingual or sublingual cresent
Retromolar pad
Alveolar ridge
Groove underneath the retromolar pad that provides extra retention to the denture
Retromylohyoid fossa
Frenums of the mandible
Labial
Buccal (one on each side)
(May need relief to prevent dentures from being dislodged)
Primary stress bearing area in the mandibular arch
Buccal Shelf
The greater access to this area the more support
buccal shelf
Denture bearing area in the mandibular
retromolar pad
What is done at a screening appointment
Medical/Dental history
Panoramic x-ray
PDI form (Determines suitability for treatment)
What is done at a comp exam for a denture patient
Complete denture prosthodontics patient evaluation and mouth examination form is filled out
What Classes of denture are okay for DMD
Class I and II are suitable for DMD
Class III is sometimes okay for DMD
Class IV need a referral for GPR or faculty
If a denture case is assigned to a DMD student a __ is started
Step card (Must be used for each step of the procedure)
After a step card is started what is done next
Primary impressions are taken
Primary impression are used to make
primary casts
What are necessary to fill in the undercuts of the primary impression
blockouts (use the minimum amount necessary, should not fill vestibule)
Once you have poured up our impression you mark it, explain this
Used to visualize where the trays will go
Must be 2-3 mm from the vestibule
Marks where the relief wax will be placed (Do not place more relief wax where there is blockout wax already)
Avoid frenum attachments (Buccal frenum needs additional horizontal leeway)
Once you have marked your pour up, you cover the pour up with baseplate wax, explain
CUt out the excess base plate wax to the line drawn on the stone pour up. use a heated buffalo knife to smooth the edges of the cuts
make sure to cut out wax from the stop areas
Once your baseplate is covered in wax, you form your custom tray, explain
A barrier is needed between the wax and the custom tray material (vaseline, aluminum foil)
After barrier is placed fastray is placed on top while being molded into the shape
Fastray is sensitive to
light
Explain the handle for the maxillary tray
15 X 15 and 5-6 mm thick
At a 15 degree angle at the tip of the tray
An indent should be placed in the middle of the handle (thumb print)
Explain the handle for the mandibular tray
Handle is a long strip that spans from molar region to molar region along the top of the tray
Height should be 1/2 up the retromolar pad
How long are the trays put into the triad
2 minutes
Trimming of custom trays is done with the __ burrs leaving __ mm of clearance from the vestibule
Acrylic
2-3 mm
Custom trays will only be as good as the __
Primary impression
Causes of tooth loss
Poor Tooth care
accidents
cancer
severer wear
genetics
Denture at ULSD steps (7)
Screening appointment
Medical/Dental History
Panorex x-ray
PDI form
Complete denture prosth. evaluation and mouth examination form filled out
step card is started
Primary impression trays taken
What is the transparent material Dentures are made of
PMMA - Polymethyl methacrylate
What is the monomer used to produce PMMA
methyl methacrylate
PMMA is naturally compatible with
human tissue
Once teeth are removed, resorption of the __ begins
Edentulous ridge
The primary stress bearing structures of the mandibular denture are the __ and __
buccal shelf and the retromolar pads
What are the secondary stress bearing structures of the mandibular denture
Residual ridges
The buccal shelf is bordered by the crest of the ridge and the attachment of the __ muscle
buccinator
The ___ is formed by the contraction of the masseter muscle and must be included in mandibular denture design
masseteric notch
The buccal shelf consists of thick cortical bone and lies at right angles to
vertical occlusal planes
Denture can impinge on this area and must be given relief - it is a sharp bony attachment for a muscle of the same name
mylohyoid ridge
With a severely atrophic/ resorbed mandible the __ is on top of the ridge
mental foramen
We DO NOT construct __ complete dentures opposing any __
Mandibular complete dentures
Maxillary natural teeth
(Forces of natural teeth will accelerate atrophy of mandibular ridge)
Can we make maxillary dentures opposing mandibular natural teeth
YES (The palate is a much more resilient supporting structure and the maxillary ridge atrophy will not be as severe)
What are the primary stress bearing structures for the maxillary denture
The horizontal portion of the hard palate and the palatal slopes of the edentulous ridges
What are the secondary stress bearing structures of the maxillary denture
crests and ridges, rugae area and maxillary tuberosity
If there is tori they are not used as a
Primary stress bearing area - given relief
