Dental Anatomy: Retention Factors

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What is the result of a narrow space between the denture and mucosa?

Saliva is distributed throughout the denture bearing area (correct)
The denture is more likely to move
Muscle activity is increased
Retention is decreased

What is the main factor contributing to the denture's retention?

Adaptation of denture base to mucosa
Muscle activity (correct)
Atmosphere pressure and peripheral seal
Position of the denture's teeth

Where is the correct position of the denture's teeth?

The area where the cheeks and lips meet
The area where the tongue's thrust force is highest
The posterior palatal closure
The neutral zone area (correct)

What is the result of a peripheral seal?

Negative atmospheric pressure (D) Signup and view all the answers

What is involved in the peripheral seal?

Labial, buccal, and lingual vestibules, and posterior palatal closure (D) Signup and view all the answers

What is the purpose of the polished surfaces of the denture?

To help retention (D) Signup and view all the answers

What is the purpose of smoothing the impression with a wet finger?

To gain better details of the tissue (C) Signup and view all the answers

What should be ensured when taking the primary impression of the mandible?

All borders should be exact and round (C) Signup and view all the answers

What is a common fault in diagnostic impression?

The existence of incomplete extensions (C) Signup and view all the answers

What is the reason for not correcting incomplete extensions with wax?

Wax is distorted during the pouring of plaster (B) Signup and view all the answers

Why should perforated trays or adhesives be used?

To prevent the separation of the impression from the tray (B) Signup and view all the answers

What is one of the characteristics of a custom tray?

It should be rigid, but not too thick (D) Signup and view all the answers

What is the approximate basal seat area of the maxilla?

24 cm2 (D) Signup and view all the answers

What is the ideal thickness of mucosa for denture retention?

1.5-2.0 mm (D) Signup and view all the answers

What is the ideal length of the custom tray border in relation to the functional borders of the denture?

2-3 mm shorter (C) Signup and view all the answers

What type of saliva is beneficial for denture retention?

Thin and viscous (C) Signup and view all the answers

What is the term for the surface tension that helps in denture retention?

Capillarity (D) Signup and view all the answers

What is the purpose of angling the masseteric notch region of the denturebase?

To accommodate the masseter muscle contraction (D) Signup and view all the answers

Why do mobile tissues in the denture-bearing area affect retention?

They change place during impression and try to return to their original position (D) Signup and view all the answers

What is the ideal shape of the distobuccal corner between the masseteric notch and the buccal flange?

Rounded (B) Signup and view all the answers

What is a potential consequence of xerostomia in denture wearers?

Pain and irritation (D) Signup and view all the answers

How is the buccal flange adjusted in relation to the ridge crest?

Parallel to the ridge crest and 2-3 mm short of the external oblique ridge (B) Signup and view all the answers

How is the labial frenulum area adjusted during tray preparation?

Until there is no interference with the frenulum during functional movements (D) Signup and view all the answers

How is the tray border related to the reflection line when the lip is moved horizontally?

About 2-3 mm shorter than the reflection line (C) Signup and view all the answers

What is the purpose of the outer surface of the tray being concave?

To stabilize the tray during the impression procedure (B) Signup and view all the answers

What is the primary material used for border molding?

Impression compound (C) Signup and view all the answers

Why is the retromylohyoid area contoured?

To allow for free tongue movement (B) Signup and view all the answers

What is the purpose of checking the lingual frenulum area?

To allow for adequate freedom for tongue movement (C) Signup and view all the answers

Why does the patient place the tip of their tongue on the palate?

To accommodate the sublingual fold space (A) Signup and view all the answers

What is the purpose of protruding the tongue directly forward and side to side?