Denture Impression Surface Basics

Questions and Answers

What is the approximate size of the maxillary denture bearing area?

28 cm²

20 cm²

24 cm² (correct)

30 cm²

How does the surface area of the mandibular foundation compare to that of the maxillary area?

It is larger and provides better adhesion.

It is larger, but has no impact on adhesion.

It is equal, providing comparable adhesion.

It is smaller and results in decreased adhesion. (correct)

What is the approximate size of the mandibular denture bearing area?

14 cm² (correct)

18 cm²

16 cm²

10 cm²

Which factor contributes to the decreased adhesion of the mandibular foundation?

Decreased surface area Signup and view all the answers

Which area has a larger surface area to support the denture?

The maxillary area is larger. Signup and view all the answers

What determines the shape of the impression surface on a denture?

The impression taken prior to denture fabrication Signup and view all the answers

Which portion of the denture is included in the impression surface?

The margins of the denture's borders Signup and view all the answers

What does the term 'impression surface' specifically refer to in the context of dentures?

The area that contacts the oral tissues as shaped by the impression Signup and view all the answers

Which of the following statements accurately describes the relationship between the impression surface and the polished surface?

The impression surface includes but is not limited to the polished surface. Signup and view all the answers

What aspect of the denture is NOT part of the impression surface?

The area internal to the denture base Signup and view all the answers

What factor significantly contributes to improved capillary attraction in dentures?

Close adaptation of denture base to soft tissue Signup and view all the answers

Why is close adaptation of the denture base to soft tissue important for capillary attraction?

It facilitates better retention through capillary forces. Signup and view all the answers

Which of the following statements is least likely to improve capillary attraction?

Designing the denture to be bulky with minimal soft tissue contact Signup and view all the answers

Which factor can negatively affect capillary attraction in denture fitting?

Inadequate adaptation of the denture base to the soft tissue Signup and view all the answers

What principle is most directly enhanced by the close adaptation of the denture base to soft tissue?

Capillary attraction Signup and view all the answers

What is the primary benefit of increasing the adhesive properties of a medium in dentistry?

Enhances the retention of dental prostheses Signup and view all the answers

What is the main purpose of eliminating voids between a denture base and its basal seat?

To enhance the comfort of the wearer Signup and view all the answers

What is one key function of the posterior palatal in denture retention?

It aids in maintaining contact with the soft palate during functional movements. Signup and view all the answers

What effect does increasing the viscosity of saliva have?

Enhances the lubrication of oral tissues Signup and view all the answers

How does the posterior palatal contribute to preventing the gag reflex?

By reducing the gap formed during functional movements. Signup and view all the answers

Why is viscosity important in dental materials?

It affects the flow and application of the material Signup and view all the answers

How does increasing cohesive properties in dental mediums contribute to their effectiveness?

By promoting better integration with surrounding tissues Signup and view all the answers

What role does gravity play in the retention of mandibular dentures?

It functions as a retentive force for the mandibular denture. Signup and view all the answers

What is the primary purpose of viscosity in relation to fluids?

To provide resistance to fluid flow due to intermolecular forces. Signup and view all the answers

How does the posterior palatal aid in preventing food accumulation?

By maintaining the posterior border close to the soft palate during movement. Signup and view all the answers

Study Notes

Impression Surface

The impression surface of a denture is shaped by the impression taken, including its borders and extending to the polished surface.
Maxillary denture bearing area measures approximately 24 cm², while the mandibular area is about 14 cm².

Mandibular Foundation

The mandibular foundation has a smaller surface area, resulting in reduced adhesion capabilities.

Factors Enhancing Capillary Attraction

Close adaptation of the denture base to soft tissue significantly aids capillary attraction, promoting adhesion.

Function of the Posterior Palate

Maintains constant contact with the soft palate, enhancing retention during speech, mastication, and swallowing.
Reduces the risk of gag reflex by preventing gaps between the denture base and soft palate during functional activities.
Aids in preventing food buildup between the denture's posterior border and the soft palate.
Compensates for polymerization shrinkage, ensuring a better fit.

Role of Gravity

Acts as a retentive force for mandibular dentures while providing displacement for maxillary dentures, particularly in an upright position.

Viscosity

Defined as the resistance of a fluid to flow, influenced by intermolecular forces within the fluid.
Enhancements in viscosity improve adhesive and cohesive properties of the interposed medium.
Eliminating voids between the denture base and its basal seat contributes to overall adhesion.
Increased viscosity of saliva further supports retention of the denture.

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Description

Explore the fundamentals of denture impressions, focusing on the impression surface and its characteristics. Learn about the critical aspects of how the surface shape is determined and the significance of the borders and polished surface. Ideal for students in dental hygiene or prosthodontics.