Here are 30 viva questions and answers related to the classification and uses of casting gold alloys in dentistry:
Classification of Casting Gold Alloys:
- Q: What are casting gold alloys?
- A: Casting gold alloys are metallic mixtures containing gold, silver, copper, and other elements designed for use in dental restorations.
- Q: How are casting gold alloys classified based on gold content?
- A: They are classified as high gold (75-85% gold), medium gold (60-75% gold), and low gold (40-60% gold) alloys.
- Q: What is the purpose of adding silver to casting gold alloys?
- A: Silver improves the casting and melting characteristics of the alloy.
- Q: Why is copper included in casting gold alloys?
- A: Copper adds strength and hardness to the alloy.
- Q: What is the role of palladium in casting gold alloys?
- A: Palladium enhances the casting properties and reduces oxidation.
- Q: How are casting gold alloys classified based on their casting methods?
- A: They are classified as hand-cast alloys and machine-cast alloys. Viva Question and Answers Related to Enlarged Tongue
- Q: What is the significance of the classification based on casting methods?
- A: It determines the appropriate technique and equipment required for casting.
- Q: How do you differentiate between noble and base metal alloys?
- A: Noble alloys contain a high percentage of noble metals (gold, palladium, platinum), while base metal alloys have a lower percentage.
Uses of Casting Gold Alloys in Dentistry:
- Q: What are the primary applications of casting gold alloys in dentistry?
- A: Casting gold alloys are commonly used for crowns, bridges, inlays, onlays, and partial denture frameworks.
- Q: Why are casting gold alloys preferred for crowns and bridges?
- A: They offer excellent biocompatibility, durability, and a long history of clinical success.
- Q: How does the ductility of casting gold alloys benefit their use in dentistry?
- A: Ductility allows for easy manipulation during casting and adaptation to the tooth structure.
- Q: What makes casting gold alloys suitable for inlays and onlays?
- A: Their ability to provide precise and accurate marginal fit.
- Q: Why might a dentist choose a casting gold alloy for a partial denture framework?
- A: Casting gold alloys are lightweight, corrosion-resistant, and offer high strength.
- Q: How do casting gold alloys contribute to patient comfort in dental restorations?
- A: They exhibit good thermal conductivity, reducing sensitivity to temperature changes.
- Q: Can casting gold alloys be used for implant restorations?
- A: Yes, casting gold alloys are sometimes employed for implant superstructures due to their biocompatibility and longevity.
- Q: How does the esthetic aspect of casting gold alloys compare to other materials?
- A: While gold alloys may not match the esthetic appeal of tooth-colored materials, they have a classic and timeless appearance. Viva Questions and Answers Related to Tongue thrust Habit
General Questions:
- Q: What factors influence the selection of a specific casting gold alloy for a dental restoration?
- A: Factors include the location in the mouth, patient preferences, cost, and the mechanical properties required.
- Q: How is the casting process carried out for gold alloys in dentistry?
- A: The process involves wax pattern creation, investing, burnout, casting, and finishing.
- Q: What precautions are taken during the casting process to avoid porosity in gold alloys?
- A: Proper investment and burnout procedures, along with appropriate casting temperatures, help prevent porosity.
- Q: Can casting gold alloys be used in pediatric dentistry?
- A: While not common due to esthetic considerations, they can be used in certain cases for their durability.
- Q: How does the cost of casting gold alloys compare to other dental materials?
- A: Casting gold alloys are generally more expensive, but their longevity may justify the initial investment.
- Q: Are there any contraindications for using casting gold alloys in dental restorations?
- A: Allergies to specific alloy components and patient esthetic concerns may be contraindications.
- Q: What maintenance is required for dental restorations made from casting gold alloys?
- A: Regular oral hygiene practices and professional cleanings are typically sufficient for maintenance. Viva Question and Answers Related to Cement Bases in Dentistry
- Q: Can casting gold alloys be used for temporary restorations?
- A: While not common, they can be used for temporary restorations in specific cases.
- Q: How does the modulus of elasticity of casting gold alloys influence their clinical performance?
- A: A suitable modulus of elasticity ensures proper stress distribution and prevents damage to the restoration or supporting structures.
- Q: Are there any environmental considerations in the use of casting gold alloys?
- A: Recycling options are available, contributing to a more sustainable practice.
- Q: Can casting gold alloys be veneered with porcelain for esthetic reasons?
- A: Yes, it is possible to veneer casting gold alloys with porcelain to improve esthetics.
- Q: How does the coefficient of thermal expansion of casting gold alloys affect their performance?
- A: A matching coefficient of thermal expansion helps prevent distortion or stress in the restoration.
- Q: Can casting gold alloys be laser-welded for repairs or adjustments?
- A: Yes, laser welding is a viable option for making repairs or adjustments to casting gold alloy restorations.
- Q: What advancements have been made in casting gold alloys in recent years?
- A: Advancements include the development of new alloys with improved properties and techniques for more precise casting.
These questions and answers cover a range of topics related to the classification and uses of casting gold alloys in dentistry, providing a comprehensive overview for a viva examination.
