Fixed and Removable Prosthodontics Flashcards

Which cementation agent provides the highest film thickness tolerance and is most biocompatible for cementing a final all-ceramic crown?

Answer: Resin-modified glass ionomer (RMGI)

Resin-modified glass ionomer cement offers fluoride release, adhesion to tooth structure, and acceptable biocompatibility with low solubility, making it suitable for all-ceramic restorations.

When recording the centric relation (CR) for a complete denture patient, which technique minimizes muscle engrams and guides the condyles to their most superior, anterior, and medially seated position?

Answer: Bimanual manipulation (Dawson technique)

Dawson's bimanual manipulation guides both condyles simultaneously to a repeatable, musculoskeletally stable position, considered the most reliable method for recording CR.

A patient reports that their new complete maxillary denture causes gagging. The most likely prosthodontic cause is:

Answer: Over-extension of the posterior palatal seal area

Over-extension beyond the vibrating line into the soft palate or a posterior border that is too thick stimulates the gag reflex.

In fixed prosthodontics, the 'anti-rotation' feature of a preparation is most critical when designing restorations for which tooth?

Answer: Maxillary central incisor

Maxillary central incisors have a circular cross-section, making anti-rotation features (grooves, boxes) essential to prevent the crown from rotating on the prepared tooth.

Which Kennedy classification describes an edentulous arch with bilateral posterior edentulous areas (distal extensions)?

Answer: Kennedy Class I

Kennedy Class I is defined as bilateral distal extension edentulous areas, requiring a tooth-and-tissue-supported RPD.

A mandibular lingual bar major connector should be positioned at least how far below the free gingival margin?

Answer: 4–5 mm

The superior border of a lingual bar must be 4–5 mm below the free gingival margin to avoid impinging on the gingiva and to clear the floor of the mouth.

Which material is contraindicated for use as a temporary (provisional) crown under a rubber dam if the final restoration will be bonded with resin cement?

Answer: Eugenol-containing provisional cement

Eugenol from provisional cements penetrates dentinal tubules and inhibits polymerization of resin cements, leading to bond failure of the final restoration.