Dentistry Chapter: Denture Retention

Questions and Answers

What is a key advantage of tapering the seal posteriorly?

It enhances the aesthetic appearance of the prosthesis.

It simplifies the fabrication process of the denture.

It minimizes the need for adjustment periods.

It creates a more accurate maxillo mandibular record. (correct)

What are the potential risks of not tapering the seal posteriorly?

Increased tissue irritation due to improper fit. (correct)

Easier adjustment periods for the new denture wearer.

Improved retention of the denture.

Enhanced psychological security for the patient.

Which statement correctly describes the fluid wax technique?

It uses waxes that do not flow at mouth temperature.

It is primarily a non-physiologic method of securing the denture.

It requires the use of elastomeric impression material.

It follows the same procedure as conventional technique. (correct)

What is one of the four types of wax that can be used in the fluid wax technique?

Korecta wax no. 4 (orange) Signup and view all the answers

What is a disadvantage of the tapering technique used in denture fittings?

It relies on careful scraping of the cast. Signup and view all the answers

How do the wax types used in the fluid wax technique perform at mouth temperature?

They flow to ensure a better fit. Signup and view all the answers

Which material is NOT suitable for use in the fluid wax technique?

Elastomeric impression material Signup and view all the answers

What can be concluded about the psychological effects of the tapering technique on patients?

Patients may feel reassured about the retention of the completed prosthesis. Signup and view all the answers

What is the purpose of the pterygomaxillary seal?

To maintain the integrity of the denture base Signup and view all the answers

Where are the fovea palatina located?

On either side of the midline of the hard palate Signup and view all the answers

The medial palatal raphe is characterized by what feature?

Containing little or no submucosa Signup and view all the answers

What is the vibrating line used for in dentistry?

To mark the transition from movable to immovable tissues Signup and view all the answers

What can cause dislodging forces in the area of the posterior palatal seal?

Presence of thick, ropy saliva Signup and view all the answers

What is indicated if the tours palatini extend to the bony limit of the palate?

Removal of the removable prosthesis Signup and view all the answers

What defines the anterior vibrating line?

It is located at the junction of immovable and movable tissues Signup and view all the answers

What role does the pterygomaxillary fold play during the impression procedure?

It influences the posterior border seal when the mouth is wide open Signup and view all the answers

What is the primary purpose of the posterior palatal seal in a maxillary complete denture?

To provide a vacuum seal between the denture and the soft palate Signup and view all the answers

What factors contribute to the retention of a denture?

Adhesion, cohesion, and interfacial surface tension Signup and view all the answers

Where is the peripheral seal of the maxillary denture primarily located?

Along the border of the denture base Signup and view all the answers

What happens to the acrylic in the posterior palatal area of the maxillary cast during the denture creation process?

It distorts slightly and pulls away Signup and view all the answers

How does the posterior palatal seal benefit the retention of a maxillary denture?

By reducing the amount of air passage between the denture and tissue Signup and view all the answers

What must be considered when creating an effective posterior palatal seal?

The flexibility of the soft tissues Signup and view all the answers

The peripheral border of a well-fitting denture must be compatible with what?

The muscles and tissues creating the mucobuccal and mucolabial spaces Signup and view all the answers

Which anatomical boundaries does the posterior palatal seal have?

Two separate boundaries: post palatal seal and pterygomaxillary seal Signup and view all the answers

What does the escape of air bubbles under the posterior border of a denture indicate?

It indicates under damming. Signup and view all the answers

What is a common cause of overdamming in denture fitting?

Excess scraping of the master cast. Signup and view all the answers

Which material is NOT suggested for correcting a short posterior palatal seal?

Liquid wax adhesive. Signup and view all the answers

When is it recommended to record the posterior palatal seal for optimal patient confidence?

Before try in. Signup and view all the answers

What technique is suggested for the addition of a posterior palatal seal to an existing denture?

Fluid wax technique with auto polymerizing acrylic resin. Signup and view all the answers

What might occur if the posterior border of a denture is displaced inferiorly upon insertion?

Loss of pterygo maxillary seal. Signup and view all the answers

Which of the following describes a recommended prevention method for correcting overdamming?

Reduction of the denture border with a carbide bur. Signup and view all the answers

If an existing denture shows vertical dimension or esthetic issues, what action should be taken?

Make new dentures. Signup and view all the answers

What is the recommended patient position during the impression making for the palatal seal area?

Seated upright with head flexed 30 degrees forward Signup and view all the answers

How long should the impression be held in place after application?

4-6 minutes Signup and view all the answers

What should be done if tissue contact is not established after the initial impression?

Add more wax and redo the procedure Signup and view all the answers

Which of the following is an advantage of using this impression technique?

Incorporation of posterior palatal seal for retention Signup and view all the answers

What is indicated by a glossy appearance of the impression upon removal?

Successful impression with established tissue contact Signup and view all the answers

What is a disadvantage of the impression technique described?

More time is necessary during the impression appointment Signup and view all the answers

What should be done after the secondary impression is made?

Reinsert and apply firm pressure to mid palatal area Signup and view all the answers

Which of these actions is avoided by using the physiological impression technique?

Over compression of tissue Signup and view all the answers

Study Notes

Denture Retention and Stability

Creating a partial vacuum enhances retention and stability of maxillary dentures.
Increased strength of maxillary denture bases contributes to patient comfort and confidence.

Peripheral Seal

Peripheral seal forms contact area between the mucosa and denture base, preventing air passage.
Retention relies on adhesion, cohesion, and interfacial surface tension to counter dislodging forces.
Posterior palatal seal (PPS) compensates for acrylic distortion, pulling away from posterior palatal area.
PPS creates a vacuum seal with the soft palate, providing secure denture placement.

Anatomical Considerations

PPS is divided into post palatal and pterygomaxillary seals.
Post palatal seal spans from one tuberosity to the other; pterygomaxillary seal extends laterally from the pterygo maxillary notch.
Fovea palatina serves as a guideline for placing the PPS but should not be solely relied upon.
The medial palatine raphe has minimal submucosa, making it less tolerant to compression.

Physiological Considerations

Thick saliva can generate hydrostatic pressure, applying downward dislodging forces anterior to the PPS.

Vibrating Line

An imaginary line divides movable and immovable soft palate tissues, crucial for accurate denture fitting.
Incorrect tapering of the posterior seal can lead to tissue irritation.

Advantages of Proper PPS Technique

Enhances retention of the trial base.
Produces accurate maxillo-mandibular records for effective denture fit.
Provides patients with psychosocial assurance of retention.

Disadvantages of Incorrect Technique

Non-physiologic methods can lead to over-compression of tissues.
Risks of inaccurate transfer of vibrating lines and excessive scraping of the cast.

Fluid Wax Technique

Flowing wax at mouth temperature is used for accurate marking of anterior and posterior vibrating lines.
Patient must be positioned upright during impression making for optimal results.
Physiologic techniques prevent over-compression of tissues and incorporate the PPS.

Inspection and Correction

Inspect posterior border to identify areas of under-damming or over-postdamming.
Prevention involves careful scraping and adjustments to the denture border as needed.

Alterations to Existing Dentures

Examine existing dentures for poor PPS length and depth.
Whether existing dentures require adjustment or a complete remake depends on additional issues like vertical dimension or aesthetics.
Techniques for adding a PPS include use of fluid wax or acrylic resin materials.

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Description

Explore the key concepts of denture retention and stability in this informative quiz. Discover how peripheral seals and underlying forces such as adhesion and cohesion can enhance patient comfort and confidence. Test your understanding of the principles that make maxillary denture bases effective.