Material Selection & Aesthetic Customization Flashcards

A ceramist needs to restore a single maxillary central incisor next to a naturally dark contralateral tooth. Which approach best manages metamerism risk?

Answer: Evaluate and match shade under multiple light sources including daylight, incandescent, and fluorescent

Metamerism—colors matching under one light but differing under another—is minimized by verifying shade match under multiple light sources.

Which layering material is placed first over a metal coping in the PFM build-up sequence?

Answer: Opaque porcelain

Opaque porcelain is applied first to mask the metal substrate's dark color and establish the optical foundation before dentin and enamel layers.

Translucency in ceramic restorations is primarily controlled by which material characteristic?

Answer: Crystal phase content and grain size within the glass matrix

Light scattering—and therefore translucency—is determined by the volume and grain size of crystalline phases; larger or more numerous crystals increase opacity.

Which shade guide system uses a 3D classification with Value, Chroma, and Hue axes rather than organizing tabs by hue families?

Answer: VITA 3D-Master

The VITA 3D-Master system organizes shades along three perceptual dimensions (value, chroma, hue), providing more systematic shade selection.

When stacking ceramic for a restoration with an adjacent implant crown, which optical property difference must the ceramist compensate for?

Answer: Implant crowns lack natural root fluorescence and may appear darker/grayer at the cervical

Titanium or zirconia implant abutments absorb light differently than dentin, often causing cervical grayness; ceramic selection and abutment shade must compensate.

What is the primary reason feldspathic veneering porcelain is still used over high-strength zirconia frameworks despite lower inherent strength?

Answer: It provides superior optical aesthetics and layering versatility unavailable in monolithic zirconia

Feldspathic porcelain offers unmatched translucency gradients, characterization, and mimicry of natural tooth optics that monolithic high-strength materials cannot replicate.

A ceramist observes that a completed zirconia crown appears too gray under office lighting but matches in natural daylight. This is best described as:

Answer: Metamerism

Metamerism describes two colors appearing matched under one light source but mismatched under another due to different spectral reflectance curves.