Clinical Procedures & Protocols Flashcards
7 cards from real CDC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Clinical Procedures & Protocols flashcards as text
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?
Answer: Both positions must be checked to identify premature contacts that create functional stress
Premature contacts in lateral excursions create lateral forces that concentrate stress at ceramic margins and cuspal inclines, leading to fracture or debonding.
A ceramist receives an implant case with a custom titanium abutment. Before layering ceramic, what surface treatment protocol is required for the titanium surface?
Answer: Sandblast with aluminum oxide and apply a compatible titanium primer or opaque
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.
During fabrication of a layered zirconia crown, which parameter is most critical to control during the zirconia sintering phase?
Answer: Adherence to the manufacturer's specific sintering temperature and hold time profile
Deviation from manufacturer-specified sintering profiles causes dimensional inaccuracy and compromises the material's phase transformation, strength, and optical properties.
What clinical scenario indicates that a ceramic veneer should be fabricated with a wrap-around incisal edge design rather than a window preparation?
Answer: Presence of existing incisal edge wear, edge-to-edge occlusion, or deep discoloration requiring incisal masking
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.
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?
Answer: An open margin allowing microleakage, or insufficient ceramic thickness over the pulpal floor
Open margins allow thermal stimuli to reach dentin via microleakage, while inadequate ceramic thickness over the pulpal floor reduces thermal insulation, both causing sensitivity.
When the dentist sends a case requiring a ceramic restoration on a prepared tooth adjacent to existing amalgam restorations, what shade-taking protocol modification is recommended?
Answer: Shade the tooth before rubber dam placement and while the adjacent teeth are fully hydrated
Shade evaluation should occur before rubber dam isolation because dehydration from isolation artificially lightens tooth color, leading to inaccurate shade selection.
What is the purpose of including a 'long hold' step in a ceramic firing cycle before reaching maximum temperature?
Answer: To slowly drive off residual moisture and organics, preventing steam porosity and explosive spalling
A pre-drying hold below 600°C volatilizes absorbed water and organic binders gradually, preventing steam generation that causes porosity and sudden cracking during firing.