Podcast
Questions and Answers
What characteristic of ceramics ensures that the dental restorations do not release harmful elements?
What characteristic of ceramics ensures that the dental restorations do not release harmful elements?
- High hardness
- Excellent wear resistance
- Chemical inertness (correct)
- Low fracture toughness
Which property of ceramics makes them less susceptible to bacterial adhesion over time?
Which property of ceramics makes them less susceptible to bacterial adhesion over time?
- Aesthetic potential
- Refractory nature
- Moderate tensile strength
- Chemical inertness (correct)
What effect does the exposure to 1.23% APF gel have on glazed feldspathic porcelain?
What effect does the exposure to 1.23% APF gel have on glazed feldspathic porcelain?
- Increases fracture toughness
- Enhances aesthetic appearance
- Completely protects the surface
- Produces surface roughness (correct)
Which of the following fluoride gels does not significantly affect the ceramic surface?
Which of the following fluoride gels does not significantly affect the ceramic surface?
Why are ceramics generally more resistant to corrosion than plastics?
Why are ceramics generally more resistant to corrosion than plastics?
How does the exposure of ceramics to APF influence their stability over time?
How does the exposure of ceramics to APF influence their stability over time?
What is a significant risk associated with using APF gels on ceramic restorations?
What is a significant risk associated with using APF gels on ceramic restorations?
What protective measures should be taken when using APF gels on glazed ceramic surfaces?
What protective measures should be taken when using APF gels on glazed ceramic surfaces?
Which property of ceramics can be described as low to moderate in nature?
Which property of ceramics can be described as low to moderate in nature?
Ceramics are typically customized for dental applications by controlling which of the following?
Ceramics are typically customized for dental applications by controlling which of the following?
Flashcards
Chemical inertness
Chemical inertness
The ability of a material not to react with other substances, particularly in a biological environment.
Refractory nature
Refractory nature
Refers to the ability of a material to withstand high temperatures without significant changes in its properties.
High hardness, low fracture toughness
High hardness, low fracture toughness
Ceramic materials are generally hard but can be brittle and prone to breaking under tension.
Wear resistance
Wear resistance
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Tensile fracture
Tensile fracture
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Biocompatibility
Biocompatibility
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Chemical inertness
Chemical inertness
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Wear resistance
Wear resistance
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Aesthetic potential
Aesthetic potential
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Corrosion resistance
Corrosion resistance
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Study Notes
Ceramic Properties for Dental Applications
- Ceramics in dentistry are tailored for specific functions by adjusting their composition
- They differ from metals, resins, and composites, exhibiting unique characteristics
- Key traits include biocompatibility, aesthetics, refractoriness, high hardness, moderate fracture toughness, wear resistance, susceptibility to tensile fracture, and chemical inertness
Chemical Properties of Ceramics
- Chemical inertness is crucial in dental restorations, preventing the release of harmful materials and surface degradation over time
- This characteristic makes ceramics resistant to corrosion, a key advantage over plastics
- Ceramics resist most liquids, gases, alkalis and weak acids, and retain stability over extended periods
- However, some corrosion is possible in simulated oral conditions
Fluoride Effects on Ceramics
- Acidulated phosphate fluoride (APF) can etch glass-based ceramics by removing sodium ions, disrupting the silica structure.
- Exposure to APF leads to surface roughness and preferential attack, particularly on glazed feldspathic porcelain (within minutes)
- Neutral fluoride solutions, like stannous fluoride and sodium fluoride, have minimal impact on ceramic surfaces
- Dentists must consider fluoride's impact on ceramic restorations and avoid APF gels near such restorations
- Protecting surfaces with petroleum jelly, cocoa butter, or wax is recommended when APF is necessary.
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