Questions and Answers
What is the primary function of a denture base?
Free-end partial denture bases have no supporting teeth on one side.
True
Identify one requirement of an ideal denture base material.
Accuracy of adaptation to the tissues
The _____ is defined as the rotation of a partial denture around a fulcrum.
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Match the types of denture bases with their descriptions:
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Which of the following is NOT a function of the denture base?
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The denture base provides stabilization against tipping of distal-extension dentures.
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Explain one reason why a denture base needs to allow thermal conductivity.
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What is the primary purpose of acrylic resin in denture bases?
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Tissue stops are not essential in determining acrylic resin thickness.
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Which property is more prominent in porcelain teeth compared to acrylic teeth?
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What are the two common configurations for attaching denture bases?
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Acrylic teeth are less liable to distort by temperature compared to porcelain teeth.
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The finish line at the junction of the major connector and denture base is referred to as a __________.
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What is the primary means of retention for porcelain teeth?
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Acrylic resin teeth have _______ abrasion resistance compared to porcelain teeth.
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Match the types of denture base extensions with their descriptions:
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Match the following properties with either acrylic or porcelain teeth:
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Which of the following is NOT a material for artificial teeth?
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Which of the following characteristics is true for acrylic teeth?
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The relationship of the denture base to the abutment should always maintain an open contact.
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Porcelain teeth can be easily modified by grinding.
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What modifications can be made in the relationship of the denture base to abutment?
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What type of sound is often associated with porcelain teeth during use?
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What is one advantage of metallic denture bases?
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Non-metallic acrylic resin denture bases are known for their high tensile strength.
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Name one disadvantage of using metal bases for dentures.
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Combined metallic and acrylic resin bases are indicated for patients with __________ bone loss.
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Match the following denture base materials with their advantages:
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Which of the following is a disadvantage of acrylic resin denture bases?
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Metal denture bases are lighter than acrylic resin bases.
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What is a common indication for using resin bases?
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Study Notes
The Denture Base and Artificial Teeth
Component Parts of Removable Partial Dentures
- Denture Base: Supports artificial teeth and transfers occlusal stresses to tissues.
- Connectors: Include major and minor connectors for stability.
- Supporting Rests: Provide additional support to the denture.
- Retainers: Direct and indirect retainers ensure the prosthesis stays in place.
Types of Denture Bases
- Bounded Partial Denture Bases: Span an area between two abutments.
- Free-end Partial Denture Bases (Distal-extension Bases): One side attached to a natural tooth; the other side is free.
Functions of the Denture Base
- Carries and stabilizes artificial teeth.
- Transfers occlusal stresses and promotes tissue stimulation through massage.
- Provides denture retention and prevents the migration of remaining teeth.
- Offers bracing and stabilization against tipping of distal-extension dentures.
Stabilization and Tipping
- Stabilization: The resistance of a partial denture to tipping or rocking.
- Tipping: Rotation around a fulcrum, affecting the denture's effectiveness.
Requirements for Ideal Denture Base Material
- Accurate tissue adaptation and sufficient strength.
- Low specific gravity and biological acceptability.
- Good finish and thermal conductivity for tissue stimulation.
- Easy maintenance and aesthetic appeal; affordable cost.
Types of Denture Base Material
- Metallic: Often cobalt chromium alloy; preferred for bounded saddle cases.
- Non-metallic: Primarily acrylic resin; used for temporary removable partial dentures.
- Combined: Utilizes both metallic and acrylic materials for free-end cases.
Advantages and Disadvantages of Metallic Denture Bases
- Advantages: More rigid, lightweight, better thermal conductivity, precise fit, and hygienic surface.
- Disadvantages: Challenging to reline, repair, and lacks the natural appearance of oral tissues.
Advantages and Disadvantages of Acrylic Resin Denture Bases
- Advantages: Aesthetically appealing (pink color), lightweight, easy to repair and reline, and simple production.
- Disadvantages: Brittle, low tensile strength, low thermal conductivity, and porous fitting surfaces leading to hygiene issues.
Indications for Acrylic Resin Bases
- Suitable for older patients, post-extraction healing phases, and cost-effective cases.
Combined Metallic and Acrylic Resin Bases
- Ideal for free-end saddle cases, patients with extreme bone loss, and those on specific therapies like steroids.
Methods of Attaching Denture Base
- Common configurations include ladderlike patterns and closed meshwork.
- Tissue stops used to confirm acrylic thickness during fitting.
Denture Base Extension
- Maximum coverage is achieved in buccal, lingual, and posterior directions.
- Should conform to mucosal reflections and consider muscle function.
Relationship of Denture Base to Abutment
- Requires close contact to gingival margin for trauma prevention; provides an open contact area for cleanliness.
Artificial Teeth
- Made from materials such as acrylic resin, porcelain, metal, and combinations thereof, including cross-linked acrylic and Isosit.
Properties of Acrylic vs. Porcelain Teeth
- Acrylic: Lighter, less prone to distortion, chemically bonded to denture bases, and flexible in modification.
- Porcelain: Heavier, requires mechanical retention, highly abrasive, brittle, and difficult to modify.
Properties of Acrylic Resin Teeth
- Low specific gravity and less abrasive.
- Less harsh on tissues and not noisy.
- Can accommodate small interarch distances.
Properties of Porcelain Teeth
- Heavier, noisy in use, mechanical retention needed, and very brittle.
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Description
This quiz covers the essential components of removable partial dentures, including the denture base, connectors, and retainers. Test your understanding of these key parts and their functions in prosthodontic practice.
