Laboratory Techniques & Technology Flashcards
6 cards from real CDC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Laboratory Techniques & Technology flashcards as text
What is the purpose of burnout in dental casting techniques?
Answer: To remove wax and prepare the mold for casting
The purpose of burnout in dental casting techniques is to remove the wax pattern and prepare the investment mold for casting. After the wax pattern is invested in a refractory material, it is heated in a furnace, causing the wax to vaporize completely. This leaves behind a precise cavity within the investment, ready to receive molten metal or ceramic for the final restoration.
Which laboratory tool is essential for high-precision ceramic milling?
Answer: CAD/CAM milling machine
A CAD/CAM milling machine is an essential laboratory tool for high-precision ceramic milling. It uses computer-aided design data to precisely cut and shape ceramic blocks into dental restorations like crowns, bridges, and veneers. This automated process ensures exceptional accuracy, consistency, and efficiency, far surpassing the capabilities of manual fabrication methods.
Why is vacuum firing used in ceramic dental restorations?
Answer: To eliminate air bubbles and increase density
Vacuum firing is used in ceramic dental restorations primarily to eliminate air bubbles and increase the density of the ceramic material. By firing the ceramic in a vacuum environment, trapped air is removed, preventing porosity and voids that could weaken the restoration or compromise its aesthetics. This process results in a stronger, more homogeneous, and more translucent ceramic, enhancing both durability and appearance.
What is the role of digital impressions in dental prosthetics fabrication?
Answer: They provide highly accurate 3D models
Digital impressions play a crucial role in dental prosthetics fabrication by providing highly accurate 3D models of the patient's oral anatomy. These precise digital representations eliminate the inaccuracies and distortions often associated with traditional physical impressions. This leads to better-fitting prosthetics, reduced chairside adjustments, and a more efficient overall workflow.
Which step ensures strong bonding between porcelain and metal substructures?
Answer: Applying an opaque layer for bonding
Strong bonding between porcelain and metal substructures is ensured by applying an opaque layer for bonding. This specialized ceramic layer serves multiple critical functions: it chemically bonds to the metal, masks the dark color of the metal substructure, and provides a stable foundation for subsequent translucent porcelain layers. This creates a durable and aesthetically pleasing porcelain-fused-to-metal restoration.
How does sintering improve the properties of zirconia dental restorations?
Answer: It increases hardness, density, and durability
Sintering is a critical process that significantly improves the properties of zirconia dental restorations. During sintering, zirconia powder compacts are heated to high temperatures, causing the particles to fuse together without melting. This process increases the material's hardness, density, and overall durability, transforming it into a strong, stable, and long-lasting ceramic suitable for dental applications.