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Prosthodontics & Occlusion · single question

Why use a non-rigid connector in a fixed bridge?

  1. To increase slight movement of abutment
  2. To increase bridge retention
  3. To make the bridge easier to fabricate
  4. To distribute forces equally between abutments
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Correct answer: A. To increase slight movement of abutment

  • A. A NON-RIGID CONNECTOR (stress-breaker or non-rigid attachment) in a fixed partial denture allows SLIGHT INDEPENDENT MOVEMENT of the pontic and abutment. It is used when: (1) abutment teeth have different vertical forces/mobility, (2) long-span bridges cross the midline, (3) different periodontal support among abutments. It allows for differential movement between abutments with different force distributions.
  • B. Non-rigid connectors actually REDUCE rigidity and potentially retention compared to rigid connectors. They are used for biomechanical reasons, not to increase retention.
  • C. Non-rigid connectors add complexity to bridge fabrication — they are not used for laboratory convenience.
  • D. While force distribution is a goal, the specific REASON for a non-rigid connector is to allow independent movement of abutments — particularly when abutments have unequal support.

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