CDC Study Guide 2026
Everything you need to pass the CDC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CDC Exam Format at a Glance
📚 CDC Topics to Study (24)
✍️ Sample CDC Questions & Answers
1. Which material is commonly used for its natural aesthetics in dental crowns?
Lithium disilicate is a ceramic material highly valued for its exceptional natural aesthetics in dental crowns and veneers. It offers superior translucency and opalescence, closely mimicking the light-handling properties of natural tooth enamel. This allows for restorations that blend seamlessly with existing dentition, providing a highly aesthetic and lifelike appearance.
2. Metamerism in dental ceramics refers to which phenomenon?
Metamerism occurs when two objects with different spectral reflectance curves appear to match under one illuminant but differ under another, such as operatory light versus natural daylight.
3. In Certified Dental Ceramist, what is a risk matrix used for?
A risk matrix plots risks on a grid of likelihood versus impact, helping prioritize which risks need the most attention.
4. What is 'overbuild' in the context of porcelain layering, and why is it performed?
Overbuild refers to intentionally building the ceramic beyond the final planned contour to account for the 15–25% volumetric shrinkage that occurs during the sintering/firing process.
5. During the final finishing stage, a ceramist discovers that the glazed restoration has a small area of chipping on the incisal edge. What is the correct repair protocol?
A chipped area on a glazed ceramic restoration can be repaired by roughening the surface, applying compatible add-on or repair porcelain, and firing at the appropriate repair/refire temperature to fuse the new material.
6. What is the primary purpose of a vacuum cycle during dental porcelain firing?
Vacuum firing removes air and combustion gases from the porcelain mass, preventing porosity that would weaken the restoration and create opaque white spots.