Clinical Procedures & Protocols Flashcards

What is the recommended approach when a dentist's prescription specifies a contact point that the ceramist believes will compromise the ceramic's structural integrity?

Answer: Contact the dentist to discuss alternative contact design options before fabrication

The ceramist has a professional obligation to communicate structural concerns to the prescribing dentist and collaboratively determine an appropriate solution before irreversible fabrication.

During the bisque-bake (biscuit-fire) stage, a crown displays a crack at the cusp tip. What is the most appropriate course of action?

Answer: Evaluate the cause, repair with fresh ceramic of matching composition, and refire

Bisque-bake stage is the appropriate intervention point — the crack must be repaired with compatible ceramic material and refired before the glaze stage to ensure structural integrity.

Which working time consideration is most critical when using light-activated try-in paste during ceramic veneer evaluation?

Answer: Ambient operatory light can prematurely polymerize the paste, so minimize exposure time

Light-activated try-in pastes can begin polymerizing under dental operatory lights, so evaluation should be conducted efficiently to prevent premature setting.

When a ceramic restoration is returned from try-in with marginal discrepancies noted by the dentist, what information is essential for the ceramist to receive?

Answer: Location, extent, and nature of the discrepancy plus articulated models and photos

Accurate correction of marginal discrepancies requires precise documentation including location diagrams, photographs, and properly mounted models to guide laboratory adjustment.

What is the primary reason for using a vacuum furnace rather than an open-air furnace for firing high-translucency porcelain?

Answer: Vacuum firing eliminates gas porosity and produces a denser, more translucent ceramic

Vacuum firing removes atmospheric gases that would otherwise become trapped as porosity during sintering, resulting in denser ceramic with superior optical properties.

A ceramist is fabricating a three-unit bridge where the pontic area has significant alveolar ridge resorption. Which pontic design best balances hygiene access with aesthetic appearance?

Answer: Modified ridge-lap pontic providing aesthetic convexity on the facial while allowing lingual cleansability

The modified ridge-lap pontic provides the facial aesthetic appearance of tissue contact while its concave lingual contour allows interdental brush and floss access.

When evaluating a completed ceramic restoration under polarized light, what defect becomes most visible that may not be apparent under standard illumination?

Answer: Internal cracks, stress fractures, and subsurface porosity

Polarized light reveals internal stress patterns, subsurface cracks, and porosity through birefringence effects that are invisible under conventional lighting conditions.