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Questions and Answers
What type of denture base is a combination of metallic and non-metallic materials?
What is the purpose of the separating medium in denture construction?
What is the correct sequence of laboratory stages of polymerization?
What is the consequence of too early packing in denture construction?
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What is the purpose of the try-in stage in complete denture construction?
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What is the role of the special tray in complete denture construction?
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What is the consequence of delayed packing in denture construction?
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What is the purpose of the 1ry impression in complete denture construction?
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What is the difference between heat-cured and self-cured acrylic resin?
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What is the purpose of the occlusion blocks in complete denture construction?
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Study Notes
Ceramic Resin Denture Base
- Ceramic resin denture base combines the benefits of ceramics and resin materials.
Advantages of Ceramic Resin Denture Base
- Provides an esthetic appearance that is satisfactory.
- The glazed surface produces a restoration that is color stable and compatible with soft tissues.
- Porcelain is inert.
Disadvantages of Ceramic Resin Denture Base
- Requires removal of additional tooth structure.
- Has a high hardness number, which may result in excessive wear of opposing teeth.
- Has low tensile strength and is brittle.
- Can produce a clicking sound when in contact with opposing teeth.
Indications and Uses of Ceramic Resin Denture Base
- Used in denture teeth.
- Used in jacket crowns.
- Used in porcelain-metal crown and bridge work.
- Used in simple inlays.
Contraindications of Ceramic Resin Denture Base
- Not suitable for individuals with para-function (bruxism).
- Not suitable for short clinical crowns.
- Not suitable for immature teeth.
- Not suitable for unfavorable occlusion.
Classification of Ceramic
- Classified into four types based on fusion temperature:
- High-fusing (1300°C)
- Medium-fusing (1100-1300°C)
- Low-fusing (850-1100°C)
- Ultra-low-fusing (<850°C)
Manipulation of Ceramic
- Compaction is done by mixing ceramic powder with distilled water.
- Three methods of compaction:
- Mild vibration to pack the wet powder densely.
- Using a small spatula to apply and smooth the wet porcelain.
- Adding dry porcelain powder to absorb excess water.
Firing Procedure
- Purpose is to sinter the powder particles.
- Changes during firing include loss of water and porcelain fusion.
- Sintering is the process responsible for the fusion of powder particles.
Glazing
- Reached in the last firing.
- Self-glaze porcelain or low-fusing glass is added.
- Self-glaze porcelain is preferred due to its higher firing temperature and resistance to oral fluids.
- Glazing produces a smooth, shiny surface.
Cooling
- Slow cooling is necessary to avoid surface crazing.
Criteria for an Ideal Denture Base Material
- Adequate strength to resist fracture.
- Adequate resilience to absorb energy without deformation.
- High impact strength to resist fracture.
- Good abrasion resistance.
- High thermal conductivity for biophysical comfort.
- Radio-opacity.
- Easy to process and repair.
- Aesthetically satisfactory.
Denture Bases
- Can be classified into:
- Metallic (e.g., gold alloy type IV)
- Non-metallic (e.g., acrylic resin)
- Combination of metallic and non-metallic
Complete Denture Construction
- Steps involved:
- Diagnosis and X-ray
- Primary impression and cast
- Secondary impression and cast
- Occlusion blocks
- Jaw relation and mounting on articulator
- Setting of teeth
- Try-in
- Procedure for transforming the temporary denture base into a permanent one.
Acrylic Resin
- Can be heat-cured or self-cured.
- Laboratory stages of polymerization:
- Sandy
- Stringy
- Dough
- Rubbery
- Stiff¹
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Description
Quiz on ceramic resin denture base, including advantages and disadvantages of porcelain restorations, such as esthetic appearance, compatibility with soft tissues, and drawbacks like tooth structure removal and brittleness.
