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.

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  1. Chlorhexidine gluconate is used as an endodontic irrigant because it provides:

    Answer: Substantivity through prolonged antimicrobial activity

    Chlorhexidine's substantivity (sustained antimicrobial effect after removal) is its key advantage, as it binds to dentinal walls and continues acting for hours.

  2. The setting reaction of calcium silicate-based cements (MTA, Biodentine) requires:

    Answer: Water as a reactant to form calcium silicate hydrate and calcium hydroxide

    Calcium silicate cements undergo hydraulic setting, where water reacts with tricalcium and dicalcate silicate to form C-S-H gel and calcium hydroxide.

  3. Which property distinguishes resilon from gutta-percha as an obturation material?

    Answer: Ability to bond chemically to resin-based sealers

    Resilon can chemically bond to resin-based sealers like Epiphany, creating a 'monoblock' obturation theoretically improving the apical seal.

  4. Sodium hypochlorite at 5.25% concentration injected inadvertently beyond the apex may cause:

    Answer: Severe tissue injury with pain, edema, and possible ecchymosis

    NaOCl accidents cause immediate severe pain, significant edema, and ecchymosis due to the caustic nature of hypochlorite dissolving soft tissue.

  5. The primary advantage of using a fiber post over a cast metal post-and-core is:

    Answer: Modulus of elasticity similar to dentin, reducing root fracture risk

    Fiber posts have a modulus of elasticity (approximately 18-40 GPa) closer to dentin (18 GPa), distributing stress more evenly and reducing catastrophic root fractures.

  6. Premixed bioceramic putty materials used in endodontics are typically packaged in syringes because they:

    Answer: Do not set until exposed to moisture, remaining stable in hermetic packaging

    Premixed bioceramics remain workable in hermetically sealed syringes because they require moisture from dentinal tubules and tissue fluid to initiate the setting reaction.

  7. Which endodontic sealer is contraindicated in patients with known allergy to its primary organic component?

    Answer: Zinc oxide eugenol sealer – contraindicated in patients allergic to clove oil/eugenol

    ZOE sealers contain eugenol which is chemically related to clove oil; patients with known eugenol sensitivity should receive alternative sealers.