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Prosthodontics & Occlusion · single question

Using the Lekholm and Zarb classification, which bone quality offers the POOREST primary stability and is most challenging for predictable implant placement?

  1. Type IV (thin cortex with sparse, low-density trabecular bone, typical posterior maxilla)
  2. Type I (homogeneous dense cortical bone)
  3. Type II (thick cortex with dense trabecular bone)
  4. Type III (thin cortex with dense trabecular core)
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Correct answer: A. Type IV (thin cortex with sparse, low-density trabecular bone, typical posterior maxilla)

Type IV bone has a thin cortex and loose trabeculae, giving poor primary stability and the highest risk of early implant failure, classically in the posterior maxilla. (Type I, very dense bone, risks overheating and reduced vascularity but generally provides good stability.)Other options: Types I-III provide progressively better primary stability than Type IV.Key exam takeaway: Lekholm-Zarb Type IV (posterior maxilla) = poorest primary stability for implants.

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