Ceramic Application & Contouring Flashcards

During the characterization firing of a ceramic crown, the ceramist applies a violet-blue incisal effect ceramic. This modifier primarily serves to:

Answer: Simulate the natural blue-gray opalescent hue seen in young enamel incisal thirds

Violet-blue incisal effect ceramics replicate the opalescence of young enamel, which scatters short wavelengths of light and appears blue-gray in reflected light.

A ceramist is applying ceramic to a screw-retained implant crown on a CAD/CAM zirconia coping. Which firing schedule adjustment is required compared to PFM firing?

Answer: Lower peak temperature using porcelain specifically compatible with zirconia CTEs

Veneering ceramics for zirconia must be formulated with a coefficient of thermal expansion matched to zirconia (~10.5 × 10⁻⁶/°C) and fired at temperatures specified by the zirconia manufacturer.

The 'cut-back technique' for all-ceramic anterior crowns involves:

Answer: Removing buccal and incisal ceramic from a full-contour wax-up to create space for incisal and enamel layering

The cut-back technique removes ceramic from the facial and incisal areas of a full-contour base layer, creating space to add translucent incisal and enamel layers for enhanced esthetics.

When evaluating final ceramic contour against the patient's natural teeth, the ceramist should check the line angles of the restoration because they:

Answer: Influence how light reflects off the restoration and create apparent width or narrowing of the tooth

Facial line angles control light reflection zones; placing them wider apart makes a tooth appear broader, while moving them closer together creates the illusion of a narrower tooth.

If a ceramist builds the ceramic too thick on the lingual aspect of a maxillary anterior crown, the most likely clinical consequence is:

Answer: Interference with mandibular excursive movements causing premature contact

Excessive lingual ceramic bulk on maxillary anteriors reduces clearance for mandibular teeth during protrusive and lateral excursions, creating destructive premature contacts.

During final contouring of a ceramic restoration on the articulator, the ceramist uses articulating paper. A dark, broad mark on the ceramic indicates:

Answer: A premature or heavy contact that requires selective reduction

Dark, broad articulating marks indicate heavy or premature contact points that must be selectively reduced to achieve balanced, harmonious occlusion.

Which firing atmosphere setting is critical during the bisque (biscuit) bake of feldspathic porcelain to prevent discoloration and porosity?

Answer: Vacuum firing to remove gases and prevent oxidation within the ceramic mass

Vacuum firing during bisque bake removes atmospheric gases trapped between ceramic particles, preventing porosity and oxidation that would cause discoloration or weakened structure.