Lecture 1

Question 1

What are the three types of prosthodontics?

Answer 1

fixed
removable
maxillofacial

Question 2

What is the main function of dentures?

Answer 2

to restore function

Question 3

What is support?

Answer 3

resistance to vertical movement of the denture base toward the ridge

Question 4

What is stability?

Answer 4

resistance to horizontal or rotational movement

Question 5

What is retention?

Answer 5

resistance to displacement of the denture away from the ridge

Question 6

What are the forces of retention?

Answer 6

-interfacial surface tension
-intimate tissue contact
-border seal
-atmospheric pressure
-neuromuscular control

Question 7

What is the support of the natural dentition?

Answer 7

45 cm squared in each arch

Question 8

What is the support of complete dentures in maxillary?

Answer 8

23 cm squared

Question 9

What is the support of complete dentures in mandibular?

Answer 9

12 cm squared

Question 10

What are dentures a replacement for?

Answer 10

NO teeth

Question 11

What do you look for in intraoral exams?

Answer 11

-muscosa
-basal seat
-arch form
-interarch space

Question 12

What are the four types of patient classification?

Answer 12

philosophical, exciting/critical, hysterical, and indifferent

Question 13

What does border molding do?

Answer 13

allows the intraoral soft tissues to form the length, width, and shape of custom tray borders prior to making the secondary impression

Question 14

What are intermediate dentures?

Answer 14

fabricated prior to extracting natural teeth

Question 15

What does pressure on mucosa cause?

Answer 15

soreness and resorption

Question 16

What causes denture movement?

Answer 16

resiliency of tissue
instability of the dentures

Question 17

What is the intaglio surface?

Answer 17

inside surface of denture that touches the tissue

Question 18

What is the cameo surface?

Answer 18

outside surface of the denture

Question 19

What is Wolff’s Law?

Answer 19

living bone responds to functional stress by depositing bone in areas of stress

Question 20

How do you reduce pressure of residual ridges?

Answer 20

no contact of anterior teeth
-clinical remount and equilibration at delivery to reduce occlusal discrepancies

Question 21

What is adhesion?

Answer 21

attractions of unlike molecules for each other

Question 22

Do dentures cure edentulism?

Answer 22

no

Question 23

What does the wearing of dentures almost always cause?

Answer 23

undesirable loss of bone

Question 24

Which ridge usually resorbs more?

Answer 24

the anterior mandibular
(4 times that of maxillary)

Question 25

Characteristics of residual maxillary ridge:

Answer 25

partly covered by a layer of cortical bone after teeth are extracted

Question 26

Characteristics of residual mandibular ridge:

Answer 26

crest remains spongy, trabeculated and not very resistant to resorption

Question 27

What is the primary denture support area of mandibular arch?

Answer 27

buccal shelf

Question 28

What is the snowshoe principle?

Answer 28

decrease the pressure per unit area by extending the denture base to cover the maximum area within physiologic tolerance

Question 29

What does more saliva contact cause?

Answer 29

more contact adhesion (retention)

Question 30

What is xerostomia?

Answer 30

dryness present much difficulty for denture wearers- discomfort, ulceration, retention loss, and chewing problems

Question 31

What are factors that help with stability?

Answer 31

-shape of alveolar ridge -size of alveolar ridge/vestibular depth -flange length and shape -intimate fit of prothesis

Question 32

What is the flange?

Answer 32

the part of the denture that fits into the vestibule

Question 33

Percentage of irreversible hydrocolloid that is diatomaceous earth?

Answer 33

60%

Question 34

Percentage of irreversible hydrocolloid that is calcium sulfate?

Answer 34

16%

Question 35

Percentage of irreversible hydrocolloid that is potassium alginate?

Answer 35

15%

Question 36

Percentage of irreversible hydrocolloid that is zinc oxide?

Answer 36

4%

Question 37

Percentage of irreversible hydrocolloid that is potassium titanium fluoride?

Answer 37

3%

Question 38

Percentage of irreversible hydrocolloid that is sodium phosphate?

Answer 38

2%

Question 39

What is diatomaceous earth?

Answer 39

a filler which increases strength and stiffness and produces a smooth texture

Question 40

Do you use adhesive on metal trays?

Answer 40

no

Question 41

What do the maxillary preliminary impressions include?

Answer 41

-residual ridge -buccal and labial vestibule -frenal attachment -fovea palatinae and vibrating line -palate -tuberosities -hamular notches

Question 42

What do the maxillary preliminary impressions include?

Answer 42

-residual ridge -retromolar pad -buccal shelf areas -external oblique ridges -frenal attachments -retromylohyloid spaces -alveololingual sulcus -labial and buccal vestibules

Question 43

What are the three types of impression philosophies?

Answer 43

-minimal pressure -functional pressure -selective pressure

Question 44

What is a minimal pressure impression?

Answer 44

attempt made to exert as little pressure as possible during impression procedures -objective is to capture tissues in their most undisturbed and undisplaced form

Question 45

Why are minimal pressure impressions used?

Answer 45

thought that if tissues are caught in their undisturbed state, retention and stability of dentures would be increased

Question 46

What type of impression material is used for minimal pressure impression?

Answer 46

low viscosity and high flow

Question 47

What are functional pressure impressions?

Answer 47

impressions made with the soft tissue under a significant load -material is more viscous

Question 48

Why are functional pressure impressions made?

Answer 48

denture base-tissue contact during function would be more intimate if tissue is recorded under compression

Question 49

What are selective pressure impression ?

Answer 49

impressions with pressure on certain areas -minimal pressure on other areas -dentist decides where and how much pressure

Question 50

Why do we need a custom tray?

Answer 50

-borders can be modified to control the movable soft tissues around the impression and avoid distorting them -space can be provided inside the tray so that shape of supporting tissue can be recorded

Question 51

What is the purpose of border molding?

Answer 51

define denture border in length, width, shape, and contour