5th Class Prosthodontics: Overdentures Attachments

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Questions and Answers

What is the primary function of attachments in overdentures?

To simplify the cleaning process.

To enhance the color of the dental material.

To provide aesthetic appeal to the prosthesis.

To secure the prosthesis against lifting forces. (correct)

Which factor does NOT affect attachment selection?

Amount of bone support.

The temporal position of the patient. (correct)

Available inter-arch space.

Cost of materials.

Active retention in attachments is typically achieved by which mechanism?

Springs that fit into recesses. (correct)

Elastic bands connected to the denture.

Friction between the components.

Magnetic anchorage.

What characterizes rigid attachments in overdentures?

They grasp the abutment tooth without any movement. Signup and view all the answers

Which of the following is NOT a factor involved in the selection of attachments?

Patient's age. Signup and view all the answers

Which statement about rigid attachments is true?

They reduce the load on the supporting ridge during function. Signup and view all the answers

Which type of attachment mechanism does NOT provide active retention?

Friction between components. Signup and view all the answers

What advantage is provided by using rigid attachments with overdentures?

They contribute to stability and reduce load on the edentulous ridge. Signup and view all the answers

What is a primary advantage of the Zest anchor?

It eliminates the need for casting during the procedure. Signup and view all the answers

What is a potential disadvantage of using the Zest anchor?

It may require frequent recall visits for maintenance. Signup and view all the answers

How is the male part of the Ceka attachment characterized?

It has a rounded shape that is split vertically. Signup and view all the answers

What type of movement does the Dalbo attachment allow for?

Both rotational and vertical movement. Signup and view all the answers

What is the primary function of bar attachments?

To splint the abutment teeth and support the prosthetic appliance. Signup and view all the answers

Which of the following correctly describes the Zest anchor's female sleeve?

It fits over the nylon post which is attached to the abutment. Signup and view all the answers

In a stress breaker type Dalbo attachment, how is the male part designed?

It is always soldered to the tooth. Signup and view all the answers

What limitation does the design of the Ceka attachment have?

It can become less effective if hygiene is not maintained. Signup and view all the answers

What is the primary reason for motivating and instructing a patient in the care of an overdenture?

To promote the long-term success of the overdenture. Signup and view all the answers

Which type of toothpaste is recommended for cleaning overdentures?

Toothpaste with low abrasiveness. Signup and view all the answers

How should candidacies be treated in overdentures?

By using a 0.2% chlorhexidine solution for immersion. Signup and view all the answers

What is the function of an interproximal brush in the care of abutment teeth?

To clean all exposed root surfaces and gingival areas. Signup and view all the answers

What is a primary disadvantage of the minimum tipping of abutment teeth when subjected to lateral forces?

Transmission of forces entirely to the abutment teeth. Signup and view all the answers

How do non-rigid attachments impact the tipping force on abutment teeth?

Reduce the effect of tipping force. Signup and view all the answers

Which fluoride concentration is recommended for a daily rinse?

0.1-0.2% fluoride solution. Signup and view all the answers

In which situation is a non-rigid attachment particularly indicated?

When the distribution of remaining teeth is unfavorable for stabilization. Signup and view all the answers

What type of product is primarily used as a chemical aid in the care of abutments?

Chlorhexidine solutions. Signup and view all the answers

What happens when a rigid attachment is used with a short dowel?

Loosening of the dowel from the root. Signup and view all the answers

Which type of attachment allows for rotational movements of the denture around the anchor?

Non-rigid attachments. Signup and view all the answers

What is a characteristic feature of stud attachments?

They can have male and female components. Signup and view all the answers

What effect do non-rigid attachments have on tissue support beneath the denture?

They put greater stress on the tissues supporting the denture. Signup and view all the answers

Which type of attachment includes both intra radicular and extra radicular types?

Stud attachments. Signup and view all the answers

What type of movement do bar joints primarily allow?

Rotational movement only Signup and view all the answers

What is the function of the plastic clips in a Hader bar system?

To offer retention within the denture Signup and view all the answers

Which bar attachment system provides both rotational and vertical movement?

Ackerman clip Signup and view all the answers

Why might a schubiger unit be used instead of a Dolder bar?

To accommodate for misalignment of posts Signup and view all the answers

What is a significant disadvantage of the Egg-shaped bar joint?

It is difficult to adapt to tissue contour Signup and view all the answers

What is the main advantage of using O-ring attachments in prosthetics?

Ease in changing the attachment Signup and view all the answers

What material is typically used for the magnetizable dowel-coping in magnet systems?

Palladium cobalt-nickel alloy Signup and view all the answers

What characteristic of the O-ring allows it to return to its original shape after bending?

Elasticity Signup and view all the answers

Study Notes

Attachments in Overdentures

Attachments are mechanical devices enhancing retention and support in overdentures, connecting the prosthesis to roots, teeth, or implants.
The male part anchors to the existing tooth or implant, while the female part connects to the prosthesis.

Functions of Attachments

Secures the prosthesis against lifting forces.
Provides periodontal support.
Aids in axial force transfer from mastication muscles to the periodontium.
Distributes shearing forces and stabilizes abutment teeth.

Factors Influencing Attachment Selection

Inter-arch space, crown-root ratio, root alignment, and type of coping.
Vertical space, number of teeth, bone support, and location of abutments.
Overdenture types (tooth-supported vs. tooth-tissue supported) and opposing dentition type.
Maintenance concerns, cost, clinical experience, and personal preferences.

Retentive Mechanisms

Active retention through springs, friction between components, or magnetic anchorage.

Attachment Classifications

Rigid Attachments: Provide no movement except rotation; reduces load on edentulous ridges but transfers forces directly to abutment teeth.
Non-Rigid Attachments: Allow rotational movement of the denture, reducing tipping forces on abutment teeth but increasing stress on supporting tissues.

Conditions for Non-Rigid Attachments

Unfavorable distribution of remaining teeth.
Usage of short dowels as anchors where controlled movements are necessary.

Types of Attachments

Stud Attachments: Include intra-radicular (e.g., Zest anchor) and extra-radicular (e.g., Ceka Revax) attachments.
Bar Attachments: Serve for splinting teeth and retention; include rigid bar units and movable bar joints.
Magnet Attachments: Utilize cobalt-samarium magnets integrated into the denture base.

Stud Attachment Details

Zest Anchor: Intra-radicular attachment with a nylon post; simple procedure; risks of caries and bending require frequent recalls.
Ceka Attachment: Extra-radicular with flexible and compressible male parts for rotational movement.
Dalbo Attachment: Offers rigid, resilient, or stress-breaking options; provides movement through relief spacers.

Bar Attachment Functions

Hader Bar: Preformed plastic bar for flexibility and retention, attaches to coping wax-up.
Dolder Bar: Allows for friction retention with no movement possible between bar and sleeve.

O-Ring Attachments

Doughnut-shaped synthetic polymers enabling wide movement and ease of attachment replacement.

Oral Hygiene for Overdentures

Instruct patients on care before placement; maintain home care routines post-installation.
Suggested cleaning products include ordinary toothbrushes, low-abrasiveness toothpaste, and peroxide-based denture cleansers.

Care for Abutment Teeth

Mechanical: Clean all abutment teeth thoroughly with a brush and floss.
Chemical: Use fluoride solutions or chlorhexidine rinses daily for maintenance.

Follow-Up Prosthodontic Care

Correct occlusion, relining bases, addressing pressure spots, securing loose screws or clips, and monitoring wear signs are essential for ongoing maintenance.

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Description

This quiz focuses on the attachments used in overdentures, essential devices that enhance retention and support in dental prosthetics. You'll explore the mechanics behind these attachments and their importance in providing stability and transferring forces. Test your knowledge on the functions and components of dental attachments used in prosthodontics.