CDC Clinical Procedures & Protocols 5

Question 1

In the context of ceramic restoration delivery protocols, what is the significance of evaluating the restoration's occlusion in both maximum intercuspation and lateral excursions?

Accepted Answer

Both positions must be checked to identify premature contacts that create functional stress

Answer

Premature contacts in lateral excursions create lateral forces that concentrate stress at ceramic margins and cuspal inclines, leading to fracture or debonding.

Question 2

A ceramist receives an implant case with a custom titanium abutment. Before layering ceramic, what surface treatment protocol is required for the titanium surface?

Accepted Answer

Sandblast with aluminum oxide and apply a compatible titanium primer or opaque

Answer

Titanium requires aluminum oxide sandblasting to create micro-mechanical retention followed by a titanium-compatible bonding primer, as HF etching is inappropriate for metal substrates.

Question 3

During fabrication of a layered zirconia crown, which parameter is most critical to control during the zirconia sintering phase?

Accepted Answer

Adherence to the manufacturer's specific sintering temperature and hold time profile

Answer

Deviation from manufacturer-specified sintering profiles causes dimensional inaccuracy and compromises the material's phase transformation, strength, and optical properties.

Question 4

What clinical scenario indicates that a ceramic veneer should be fabricated with a wrap-around incisal edge design rather than a window preparation?

Accepted Answer

Presence of existing incisal edge wear, edge-to-edge occlusion, or deep discoloration requiring incisal masking

Answer

Incisal edge wrapping is indicated when masking severe discoloration or when the incisal edge is compromised, as it provides better ceramic support and improved aesthetics.

Question 5

A crown returns from delivery with the dentist reporting that the patient experiences sensitivity to cold. What fabrication-related factor could contribute to this finding?

Accepted Answer

An open margin allowing microleakage, or insufficient ceramic thickness over the pulpal floor

Answer

Open margins allow thermal stimuli to reach dentin via microleakage, while inadequate ceramic thickness over the pulpal floor reduces thermal insulation, both causing sensitivity.

(CDC) Certified Dental Ceramist Practice Test

(CDC) Certified Dental Ceramist Practice Test

CDC Clinical Procedures & Protocols 5