L3.Anatomy of the Edentulous Maxilla

Question 0

What factors make for good support of a denture?

Answer 0

1. Broad flat areas
2. Dense cortical bone
3. Thick keratinized tissue

Question 1

Name the 2 areas of primary denture support and the 1 area of secondary support for the maxilla.

Answer 1

Primary:
1. Hard Palate
2. Posterior ridge crest
Secondary:
1. Anterior ridge crest

Question 2

What factor makes for good stability?

Answer 2

Highly contoured areas with vertical walls capable of resisting horizontal forces.

Question 3

Describe each of the following 6 factors of retention? Adhesion, cohesion, atmospheric pressure, interfacial surface tension, capillary attraction & Oral-facial musculature.

Answer 3

1. Adhesion: Diff molecules clinging to each other
2. Cohesion: Like molecules clinging to one another
3. Atmospheric pressure: Increased atmospheric pressure increases retention
4. Interfacial surface tension: Wetability of material. Increased wetabilty increases retention
5. Capillary Action: Finite interface causing fluid to flow up
6. Oral-facial musculature: Muscles help increase retention but can also knock denture off

Question 4

What resorbs more quickly, cortical or alveolar bone?

Answer 4

Alveolar bone.

Question 5

What bony maxillary feature defines the posterior extension of the maxillary denture?

Answer 5

Hamular notches.

Question 6

What vestibule is affected by the forward movement of the coronoid process?

Answer 6

The maxillary buccal vestibula

Question 7

How do you determine the location of the hamular notch?

Answer 7

Via palpation, with a mirror clinically.

Question 8

What is the significance of the vibrating line?

Answer 8

It is the jct of movable & immovable tissue & the posterior extent of the maxillary prosthesis

Question 9

What is the posterior extent of the maxillary residual ridge called?

Answer 9

Maxillary tuberosities

Question 10

What is 1 advantage to Ruggae and 1 disadvantage to ruggae?

Answer 10

Advantage: Provides tactile feel for tongue to help with phonetics
Disadvantage: Due to its roughness doesn’t provide great support for dentures. Secondary support area

Question 11

What bone affects the maxillary vestibule at approximately the buccal frena?

Answer 11

Zygomatic arch

Question 12

Is the zygomatic process anterior or posterior to the buccinator muscle?

Answer 12

Anterior

Question 13

In describing the skeletal relationship b/t the maxilla and mandible, what does Class I, II & III mean?

Answer 13

Class I: Correct alignment. Maxilla directly over mandible
Class II: Maxilla is anterior to mandible
Class III: Mandible is anterior to mandible

Question 14

Describe the 3 classes of the House Soft Palate Classification and how they affect denture fit.

Answer 14

Class I: Soft palate is wide and broad. Doesn't slope downwards quickly. Good prognosis for denture.
Class II: Intermediate b/t class I & III
Class III: Slopes downward abruptly after vibrating line. Poor prognosis for denture b/c forms poor palatal seal.