Practice Test Geeks(ABE) American Board of Endodontics Practice Test
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Endodontic Materials Flashcards

7 cards from real ABE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Endodontic Materials flashcards as text

  1. The presence of a precipitate when mixing chlorhexidine and sodium hypochlorite irrigants in the canal results in formation of:

    Answer: Para-chloroaniline, a potentially carcinogenic compound

    Mixing NaOCl and chlorhexidine creates a brown precipitate of para-chloroaniline (PCA), which is potentially toxic and can stain tooth structure.

  2. The dimensional stability of zinc oxide eugenol temporary restorations is most adversely affected by:

    Answer: Moisture contamination during setting

    Moisture contamination during the setting of ZOE materials accelerates the reaction unevenly and can lead to dimensional instability and reduced strength.

  3. In the context of root canal obturation, the term 'apical plug' refers to a technique where:

    Answer: MTA or bioceramic material is condensed at the apex to create a barrier

    An apical plug technique places 3-4mm of MTA or bioceramic material at the apex to create a barrier before backfilling, commonly used in open-apex cases.

  4. Paraformaldehyde-containing pastes (e.g., N2, Endomethasone) are controversial in endodontics primarily because they:

    Answer: Release formaldehyde which is mutagenic and can cause severe tissue injury

    Paraformaldehyde releases formaldehyde which is a recognized mutagen and carcinogen; periapical extrusion can cause severe neurotoxicity and tissue necrosis.

  5. The working time of AH Plus epoxy resin sealer at room temperature (23°C) is approximately:

    Answer: 4 hours

    AH Plus has a working time of approximately 4 hours at room temperature (23°C), though it sets faster at body temperature.

  6. When using warm vertical compaction (Schilder technique), the heat carriers are used to:

    Answer: Sever and plasticize gutta-percha to allow condensation in three dimensions

    Heat carriers in Schilder technique plasticize gutta-percha, allowing it to flow into canal irregularities and lateral canals when vertically condensed.

  7. Which property of paper points makes them essential tools during endodontic procedures?

    Answer: High absorbency to dry the canal and sample exudate for cultures

    Paper points absorb moisture efficiently to dry canals before obturation and can be used to collect samples for microbiological cultures when needed.