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Questions and Answers
What is the function of a direct retainer in a removable dental prosthesis?
What is the function of a direct retainer in a removable dental prosthesis?
- To engage the tissue to resist displacement of the prosthesis from the abutment tooth
- To engage an abutment tooth to resist displacement of the prosthesis away from tissue (correct)
- To provide aesthetic enhancement to the dental prosthesis
- To stabilize the denture framework
How is a direct retainer generally classified?
How is a direct retainer generally classified?
- Attachment and Clasps (correct)
- Retraction and Stabilization
- Implant and Tooth-supported
- Temporary and Permanent
What is the function of a patrix in an attachment for a removable dental prosthesis?
What is the function of a patrix in an attachment for a removable dental prosthesis?
- Attached to the denture framework and provides stability
- Provides aesthetic enhancement to the denture framework
- Consists of a metal receptacle for the keyway
- Attached to the implant/tooth and provides retention (correct)
What type of attachment allows rotational movement between its parts?
What type of attachment allows rotational movement between its parts?
What is the purpose of using semi-precision attachment types?
What is the purpose of using semi-precision attachment types?
Attachments for removable dental prostheses are generally classified into three categories: precision, semi-precision, and non-precision.
Attachments for removable dental prostheses are generally classified into three categories: precision, semi-precision, and non-precision.
Frictional, mechanical, and magnetic attachments are examples of the types of retention that may come from attachments for removable dental prostheses.
Frictional, mechanical, and magnetic attachments are examples of the types of retention that may come from attachments for removable dental prostheses.
Resilient attachment types allow rotational movement between their parts and are used in tooth-tissue supported prosthesis.
Resilient attachment types allow rotational movement between their parts and are used in tooth-tissue supported prosthesis.
Rigid attachment types induce less torque on abutments and are used with a few implant numbers.
Rigid attachment types induce less torque on abutments and are used with a few implant numbers.
Precision attachment types come as wax or plastic patterns to be cast in a lab and are ready-made in metal.
Precision attachment types come as wax or plastic patterns to be cast in a lab and are ready-made in metal.
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Study Notes
Direct Retainers in Removable Dental Prosthesis
- Direct retainers are essential components that help secure removable dental prostheses in place, preventing movement during function.
- They are generally classified into two main types:
- Clasp assemblies that encircle the abutment tooth
- Attachments that connect a prosthetic component to an abutment through differing mechanisms
Patrix Function in Attachments
- A patrix serves as a part of an attachment mechanism between removable dental prostheses and the abutment, allowing for stability and proper alignment.
Types of Attachments and Movement
- Attachments can facilitate different types of movement; resilient attachment types specifically allow for rotational movement, aiding in tooth-tissue supported prostheses.
- Rigid attachment types reduce torque on abutments, making them suitable for prostheses supported by a limited number of implants.
Purpose of Semi-Precision Attachments
- Semi-precision attachment types provide a balance between resilience and rigidity, ensuring a more adaptable and retentive fit for removable dental prostheses.
Classification of Attachments
- Attachments for removable dental prostheses fall into three broad categories:
- Precision
- Semi-precision
- Non-precision
- Each category offers varying levels of stability and retention.
Types of Retention Offered by Attachments
- Various retention methods provided by attachments include frictional, mechanical, and magnetic retention mechanisms.
Attributes of Precision Attachments
- Precision attachment types are available as wax or plastic patterns, allowing them to be cast in a laboratory setting prior to becoming ready-made in metal.
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