31 Questions
What is the role of cohesion in denture retention?
Ensuring a close adaptation of the denture base to the mucosa
What dictates the effectiveness of cohesion in denture retention?
Thickness of the layer of saliva between the denture base and the mucosa
What is the main characteristic of interfacial surface tension in denture retention?
Causing minimal distortion or displacement of soft tissues
How does interfacial surface tension relate to cohesion in denture retention?
Both are influenced by the thickness of the layer of saliva between the denture base and the mucosa
How does atmospheric pressure contribute to denture retention?
Expelling air from underneath the denture
What is the primary function of the layer of saliva between the denture base and the mucosa?
To create cohesion between the surfaces
How does the thickness of the saliva layer affect its ability to create cohesion?
Thinner layers of saliva are more effective for cohesion
What is the relationship between the size of the denture's basal surface and the effectiveness of interfacial surface tension?
Larger basal surfaces result in higher interfacial surface tension
What is the main purpose of having properly adapted denture borders?
To prevent air from entering under the denture
How does the difference in pressure between the fitting surface and the polished surface of the denture contribute to retention?
It creates a positive force holding the denture in place
Which of the following is NOT a key factor in the effectiveness of cohesion for denture retention?
The roughness of the denture base
How does interfacial surface tension relate to cohesion in denture retention?
Interfacial surface tension and cohesion work together to contribute to denture retention
What is the main consequence of air entering under the denture during insertion?
It decreases the atmospheric pressure under the denture
Which of the following is NOT a key factor in the effectiveness of interfacial surface tension for denture retention?
The roughness of the denture base
How does the close adaptation of the denture base to the mucosa affect the effectiveness of cohesion?
It increases the effectiveness of cohesion
What is the primary factor affecting the effectiveness of cohesion in denture retention?
The thickness of the saliva layer
Which property of the layer of saliva is essential for optimal cohesion in denture retention?
Thickness
What contributes to the retention value of interfacial surface tension in denture fit?
Perfect fit of the denture base
Which factor plays a significant role in preventing air from entering under an upper denture?
The borders of the denture
What is one desirable outcome of minimal distortion or displacement of soft tissues by the impression and the denture?
Increased interfacial surface tension
How does the pressure acting on the fitting surface differ from that acting on the polished surface in relation to atmospheric pressure?
It decreases
What is the primary reason for the need for close adaptation of the denture base to the mucosa?
To ensure a thin and effective layer of saliva for cohesion and interfacial surface tension
Which property is primarily responsible for the positive force holding the denture in place when air is expelled during insertion?
Atmospheric pressure
Which factor is directly proportional to the effectiveness of interfacial surface tension in denture retention?
The size of the basal surface of the denture
What is a desirable outcome of minimal distortion or displacement of soft tissues by the impression and the denture?
A retention value of interfacial surface tension
Which statement about the relationship between cohesion and interfacial surface tension in denture retention is accurate?
They are quite similar in their action and contribute to denture retention
Which factor is NOT essential for the effectiveness of cohesion in denture retention?
The adaptation of the denture borders to adjacent tissues
What is the primary reason for the need for a perfect fit of the denture base in relation to interfacial surface tension?
To facilitate the action of interfacial surface tension in the saliva film between the denture base and mucosa
Which factor is NOT mentioned as contributing to the effectiveness of interfacial surface tension in denture retention?
The adaptation of the denture borders to adjacent tissues
What is the primary consequence of air entering under the denture during insertion?
Disruption of atmospheric pressure
Which statement about the relationship between cohesion and the layer of saliva is accurate?
Cohesion is effective in direct proportion to the thinness of the saliva layer
Study Notes
Retention in Dentures
- Cohesion is the physical attraction of like molecules for each other, occurring in the layer of saliva between the denture base and the mucosa.
- Cohesion is effective in direct proportion to the area covered by the denture.
- A thin layer of saliva is necessary for cohesion to be effective, which requires close adaptation of the denture base to the mucosa.
Interfacial Surface Tension
- Interfacial surface tension is the tension or resistance to separation possessed by the film of liquid between two well-adapted surfaces.
- It occurs in the thin film of saliva between the denture base and the mucosa of the basal seat.
- Interfacial surface tension is effective in direct proportion to the size of the basal surface of the denture.
- A perfect fit of the denture base is essential for interfacial surface tension to occur.
- One of its retentive values is minimal distortion or displacement of the soft tissues by the impression and the denture.
Atmospheric Pressure
- When an upper denture is inserted in the mouth, air is expelled out from underneath the denture.
- If the borders of the denture are properly adapted to the adjacent tissues, no air can get in.
- The pressure acting on the fitting surface of the denture is less than that acting on the polished surface, resulting in a positive force holding the denture in place.
Explore the concepts of cohesion and interfacial surface tension in relation to the adhesion of denture bases to the mucosa. Understand the importance of close adaptation and thin layers of saliva for effective adhesion.
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