CAD/CAM Digital Dentistry Flashcards
7 cards from real CDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 CAD/CAM Digital Dentistry flashcards as text
What advantage does a closed CAD/CAM system have over an open system?
Answer: Optimized integration between scanner, software, and mill with manufacturer-guaranteed accuracy
Closed systems are tightly optimized by the manufacturer, ensuring predictable outcomes but limiting material and software choices.
When staining and glazing a monolithic zirconia crown in the lab, what is the purpose of the glaze firing?
Answer: To create a smooth, glass-like surface that reduces wear on opposing teeth
Glazing fills surface micro-irregularities, producing a smooth surface that minimizes abrasion of the opposing natural dentition.
Which term describes the CAD process of virtually positioning a restoration within a digital articulated model to evaluate occlusion before milling?
Answer: Virtual occlusal analysis or digital bite check
Virtual occlusal analysis allows the technician to identify and adjust premature contacts before any material is milled.
Which factor most commonly causes chipping of veneered porcelain on a zirconia framework?
Answer: Mismatched coefficient of thermal expansion between zirconia and the veneering porcelain
A CTE mismatch creates residual tensile stresses in the porcelain during cooling, making chipping and delamination more likely.
In dental CAD/CAM, what is the function of the 'biogeneric' or 'biocopy' feature found in some design software?
Answer: It uses data from adjacent or contralateral teeth to automatically propose anatomically correct crown morphology
Biogeneric/biocopy features mirror or interpolate tooth shape from neighboring teeth, reducing manual design time.
Which milling bur diameter is typically used for final marginal finishing in a 5-axis milling unit?
Answer: 0.6 mm or 1.0 mm diameter bur
Small-diameter burs (0.6–1.0 mm) allow the mill to follow tight marginal curves and produce accurate finish lines.
What is the clinical significance of the 'cement gap' setting in CAD crown design software?
Answer: It creates controlled internal space to allow even distribution of luting cement without hydraulic pressure
An adequate cement gap (typically 50–120 µm) prevents hydraulic lock and ensures the crown seats fully without cracking.