Provisional Crown Fabrication Flashcards

Which impression material is most commonly used to create the matrix for a direct provisional crown?

Answer: Alginate

Alginate is the most common material used to take a preoperative impression for fabricating a provisional crown matrix due to its ease of use and cost-effectiveness.

When trimming a provisional crown, the marginal finish line should be:

Answer: Flush with the gingival margin or 0.5 mm subgingival

The provisional margin should be placed flush with or 0.5 mm subgingival to protect the preparation and maintain tissue health.

Which property of bis-acryl composite makes it preferable to PMMA for provisional crowns?

Answer: Less exothermic reaction during setting

Bis-acryl composites produce significantly less heat during polymerization compared to PMMA, reducing the risk of pulpal damage.

A provisional crown that lacks occlusal contacts on opposing teeth will most likely result in:

Answer: Over-eruption of the opposing tooth

Without proper occlusal contacts, the opposing tooth will over-erupt into the open space, compromising the space for the final restoration.

The 'reline' technique for a provisional crown involves:

Answer: Adding fresh acrylic inside the initial shell after seating on the preparation

The reline technique seats an initial shell over the preparation and adds fresh material inside to create an accurate fit to the actual tooth preparation.

Which cement is most appropriate for temporizing a provisional crown on a tooth with a short clinical crown?

Answer: Non-eugenol temporary cement

Non-eugenol temporary cement provides adequate retention while allowing retrievability, and avoids eugenol which can interfere with resin-based final cements.

After polishing a PMMA provisional crown, what is the FIRST step before cementing it?

Answer: Check and adjust occlusion on the articulating paper

Occlusion must be verified and adjusted on the model or in the patient's mouth before final cementation to prevent bite issues.