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Implant Prosthetics Techniques Flashcards

7 cards from real CDT 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. Which implant framework material offers the highest flexural strength and is most resistant to fracture in long-span implant bridges?

    Answer: Monolithic zirconia (5Y-PSZ)

    5Y-PSZ (cubic/tetragonal zirconia) offers flexural strength exceeding 1,000 MPa, making it highly resistant to fracture in long-span implant-supported bridges.

  2. What does 'passive fit' mean in the context of implant-supported frameworks?

    Answer: No stresses are introduced to the implants or bone when the prosthesis is seated without screw tightening

    Passive fit means the framework seats completely on all implants simultaneously with zero induced stress before any screw is engaged.

  3. Which clinical test is used chairside to verify passive fit of a multi-unit implant framework?

    Answer: Sheffield (one-screw) test

    The Sheffield (one-screw) test tightens one terminal screw and checks whether the opposite end of the framework lifts, revealing a misfit.

  4. In implant overdenture design, what is the recommended minimum number of implants for a mandibular overdenture according to the McGill Consensus?

    Answer: 2

    The McGill Consensus Statement (2002) established 2 interforaminal implants as the minimum standard of care for mandibular edentulous patients.

  5. A laboratory technician receives a scan body scan from a digital workflow. What does the scan body capture in intraoral scanning?

    Answer: The three-dimensional position and orientation of the implant

    Scan bodies (scan abutments) are precision components placed on implants that allow intraoral scanners to record the implant's exact 3D position and angulation.

  6. When planning a full-arch implant prosthesis (hybrid bridge), why is a cantilever extension generally limited to 15–20 mm distal to the last implant?

    Answer: To prevent excessive torque forces that could cause implant failure

    Cantilever extensions beyond 15–20 mm create lever-arm forces that can overload the terminal implants and cause bone loss or component fracture.

  7. Which surface treatment increases the bond strength of the resin cement to a zirconia abutment or framework?

    Answer: Airborne-particle abrasion (sandblasting) followed by MDP-containing primer

    Airborne-particle abrasion creates micromechanical retention and MDP-containing primers (e.g., Clearfil Ceramic Primer) provide chemical adhesion to zirconia.