Prosthodontics & Occlusion · single question
When the mandible undergoes resorption, what happens to its shape?
Show answer and explanation
Correct answer: B. It becomes broader
Due to the direction of bone resorption, the mandible resorbs from the ridge crest outward (centrifugally), which means the arch becomes broader as it loses height. This is the opposite of the maxilla, which resorbs centripetally (inward), becoming narrower. This difference has important implications for complete denture design over time.
- A. The ridge does not remain the same — resorption significantly alters the shape and height of the ridge.
- B. CORRECT. Mandibular resorption is centrifugal (outward), causing the arch to become broader as the ridge resorbs. The maxilla resorbs centripetally (inward), becoming narrower.
- C. Centripetal inward resorption describes the maxilla, not the mandible.
- D. The mandible becomes BROADER with resorption, not narrower. It is the maxilla that becomes narrower.
Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes