Dentures Quiz 2

Front 1

Final impression objectives

Back 1

Pressure in the impression technique is reflected as pressure in the denture base and results in soft tissue damage and bone resorption.


Support-maximum coverage provides the “snow shoe” effect.

Stability- close adaptation to the underlying mucosa is most important to reduce the horizontal movement of the denture.

Retention-atmospheric pressure, adhesion, cohesion (depends on peripheral seal), mechanical locks, and muscle control.

Esthetics-border thickness should be varied to restore facial contour and proper lip support.

Front 2

difference in techniques for final impressions can be resolved as...

Back 2

Esthetics-border thickness should be varied to restore facial contour and proper lip support.

Front 3

Fxnal Impression technique

Back 3

Soft tissues that are displaced and recorded in this position will attempt to return to the undisplaced position when the forces are released.

The dentures will be unseated from their bases by this tissue action.

When tissues are held in a displaced position, the pressure limits the normal blood flow. When normal tissues are deprived of their blood supply, the result is resorption.

Front 4

selective pressure technique

Back 4

The selective pressure technique is a combination of extension for maximum coverage within tissue tolerance with light pressure or intimate contact with the movable, loosely attached tissues in the vestibules. The impression is refined with minimum pressure utilizing a wash of light body impression material.

Front 5

custom impression trays

Back 5

Well adapted to tissues with "only slight wax blockout" of undercuts to allow for consistent and repeatable seating and accurate impressions
"2-3mm thickness"
Border extensions should be "2-3mm short" of the depth of the vestibule when the intraoral tissues are at rest
"Handle design" should not impinge on the vestibule nor distort the lips
Finger rests in the 1st molar and 2nd premolar region so the fingers should not distort the vestibule when border molding and making the mandibular master impression
Fabricated utilizing “tray acrylic” which has a
"Higher % filler material- more accurate, less
shrinkage"

Front 6

impression compound types

Back 6

Type I - impression taking
Type II - tray preparation (border molding)

Front 7

impression compound characters

Back 7

thermoplastic
low thermal conductivity
stiff and brittle at room temp

Front 8

Border molding

Back 8

"Temper the compound in the water bath"
110 degrees

Area A molded by intructing the pateint to move the mandible laterally and ateriorly, pucker and smile

Front 9

Common area of Overextension of border molding

what structure limits the thickness and length of this area

Back 9

Area A(distocorner) is a common area for overextension

coronoid process

Front 10

anterior areas molding:

Back 10

massage upper lip laterally
instruct patient to pucker and smile
check flange thickness for poper lip support

Front 11

posterior palatal seal

Back 11

place 2-3mm of compound on top of tray in butterfly config to displace tissues inarea

seat the tray firmly for 10 seconds then chill

Front 12

testing peripheral seal

Back 12

check buccal pouch, hamular notch, posterior palatal seal

check length and thickness of denture extensions

Front 13

purpose of the vent hole

Back 13

proper seating

relieve the pressure

prevent entrapment of air bubbles

Front 14

Apply Tray Adhesive

Back 14

thin layer

Front 15

key factors for successful impression

Back 15

equal lengths not equal amounts

keep strips of material widely separated so they do not flow into contact and set premature

tape your mixing pad close to the edge of the counter

tapered blade spatula

Front 16

key factors for a successful impression

Back 16

begin mixing with the tip of your spatula and confine it to a small area of the pad

apply a thin layer to imp materal

tray is coated as opposed to loaded-no bubbles

Front 17

window way imp. technique

Back 17

used to highly mobile or hypertropic tissue minimum displacement

Front 18

mandibular custom tray extension

Back 18

2-3mm short of the frenum

Front 19

border molding for mandibular

Back 19

dry tray

heat compound and apply to area A on one side(buccal area)

Front 20

trimming compound

Back 20

chill, trim excess with red handled knife

Front 21

Compound molding

Back 21

A-D(posterior lingual)-E(lingual lateral)

Front 22

Border molding D

Back 22

push tongue against your thumb place in the lower incisor area, proper D extension-->seal for mandibular denture

Front 23

border molding cutback

Back 23

-scrape back .5mm in width and height for impression materail

Front 24

apply tray adhesive

Back 24

after cutback apply polysulfide thin layer, 3-4mm beyond border

Front 25

Mandibular impression

Back 25

do not let of tray, hold until material is polymerized

Front 26

favorable floor of mouth posturre

Back 26

impressions dentures made for patients with favorable floor of mouth posture and favorable tongue position.

note length of lingual flange-stability and retention enhanced

Front 27

Dentures retained with osseointegrated implants

Back 27

-improved retention-snap in
-improved stability
-improved support
-improved control of bolus
-improved mastication

Front 28

What are the 2 primary support areas of the mandible?

Back 28

RMP (retromolar pad)
Buccal Shelf

Front 29

Define retention, stability, & support

Back 29

Retention - Resistance to vertical displacement of the denture away from the denture bearing surface
Stability – Resistance to lateral displacement of the denture during function
Support – Resistance to vertical forces of occlusion. Factors affecting the bearing surface that resist or absorb occlusal loads during function

Front 30

Describe the pattern of resorption of the maxilla/mandible following tooth extraction

Back 30

First in a buccal-lingual direction towards the lingual
Then in a vertical direction
(If ask for mandible then first in buccal-lingual direction towards buccal, then in a vertical direction
overall result is pseudo-class III)

mandible:
b/l dirrection towards the buccal, then in vertical