Dentures

Question 1

A denture with excessive VDO will result in…

Answer 1

Inefficient mastication (not enough space to chew properly before dentures contact)

Trauma to supporting/underling soft tissue (due to excessive force)

Manifest as a “full mouth” as well as difficulty pronouncing words

Question 2

Which sound is created when there is a very slight space in between the upper and lower teeth where the air can escape and create a sibilant sound (hissing sound)?

Answer 2

“S” sounds

Question 3

When are “f” and “v” sounds made?

Answer 3

When the air escapes out of the mouth while the upper anterior teeth slowly close down and touch the lower lip

Question 4

When are “T” and “Th” sounds formed?

Answer 4

When the mouth is slightly open and the tongue contacts with the tip or lingual surface of the upper anterior teeth

Question 5

What is the best way to record an accurate impression of mobile hyperplastic tissue?

Answer 5

Make an impression of the tissue in its passive position

Question 6

The hamular notch helps in determining the ____ border of the maxillary denture

Answer 6

Distolateral

Question 7

True or false… the arrangement of maxillary posterior teeth are directly influenced by the hamular notch.

Answer 7

False. In ideal occlusion, the lingual cusps of maxillary posterior teeth are set up pointing towards the alveolar crest of the lower arch

Question 8

The _____ is an anatomical landmark and a limiting structure that serves as a guide for where the denture should terminate posteriorly

Answer 8

Hamular notch

Question 9

The strict acrylic processing temperature guidelines during denture fabrication are meant to ensure ____. Why?

Answer 9

The monomer is not boiled off

Boiling off monomer causes porosities which render the denture less durable and more prone to plaque accumulation

Question 10

Heat-cured acrylic must be processed slowly to prevent ____. The boiling point of the monomer is ___C. Polymerization of the acrylic occurs effectively at ___C. Temperature may reach 100C since conversion is an ___ process.

Answer 10

100.3

70

Exothermic

Question 11

What structure do anterior porcelain denture teeth have that other acrylic teeth do not? Why?

Answer 11

Pins.

Porcelain has no ability to bond to acrylic so mechanical retention must be achieved with the use of pins and diatorics

Question 12

Anterior porcelain denture teeth are fabricated with ___. Posterior porcelain denture teeth are fabricated with ___.

Answer 12

Pins

Diatorics

Question 13

What is the advantage of porcelain denture teeth over acrylic denture teeth?

Answer 13

More esthetics

Abrasion resistant

Stain resistant

Brittle (not necessarily an advantage)

Question 14

What is an unfavorable consequence of placing mandibular molars on the ascending border of the ramus during the fabrication of a complete denture?

Answer 14

The occlusal forces over the inclined ramus would dislodge the mandibular denture.

As the ramus of the mandible ascends, it approximates the bulbous maxillary tuberosity, which makes placement of denture teeth more difficult.

Denture molar teeth do not occlude properly along the ascending ramus because of their angulated position and stress from strong forces from the muscles of mastication

Denture molar teeth are best positioned along the residual ridge before the ascending ramus and retromolar pad

Question 15

What is the most likely reason for a midline fracture of a denture that has been used for many years?

Answer 15

Advanced resorption of the alveolar ridge

Question 16

True or false… unsupported lips and absence of vermillion border together with a relatively short lower 1/3rd to the face is indicative of an incorrect amount of freeway space.

Answer 16

False. Incorrect VDO

Question 17

Which type of suture is indicated in an immediate denture case to promote the best wound healing for the alveolar ridge?

Answer 17

Interrupted - they are more stable and provider better adaptation of the wound edges

Continuous sutures pose a greater possibility of coming loose under frictional and occlusal forces from the tissue side of immediate denture

Question 18

___- accounts for the need of repeated adjustments in the denture when the mouth is in centric relation

Answer 18

Loss of even contacts

Question 19

A ___ is created and incorporated into a fabricated denture to compensate for the shrinkage of acrylic after the processing of dentures

Answer 19

Posterior palatal seal

To create the posterior seal, the master cast is slightly carved around the area of the vibrating line to crease more acrylic thickness to make up for the shrinkage - - - another method is to place IOWA wax along the area where the soft moveable tissue meets the hard palate. The body heat will melt the wax to create an impression of the area with extra bulk.

Question 20

True or false.. unnecessary increases in the vertical dimension of occlusion will cause stress and muscular pain

Answer 20

True

Question 21

What complication indicates that the posterior palatal seal of a maxillary denture is too thick?

Answer 21

Unseating of the denture

Over-extending the coverage of the seal will cause gagging and painful swallowing