Ankylosis results in which type of resorption?

Ankylosis results in which type of resorption?

• A. Replacement resorption
• B. External resorption
• C. Internal resorption
• D. Inflammatory resorption

Answer: (A)

Ankylosis occurs when the tooth root becomes directly fused to the surrounding alveolar bone, with the periodontal ligament space effectively lost. Because the root surface is resorbed and simultaneously new bone is laid down in its place, the tooth is gradually replaced by bone. This pattern is called replacement (substitution) resorption. The lack of a normal PDL means the tooth cannot maintain its separate attachment and is integrated into the bone over time. External resorption would involve loss of root surface on the outer aspect, often from inflammatory or mechanical sources, not replacement by bone. Internal resorption starts within the pulp canal, not at the root-bone interface. Inflammatory resorption describes resorption driven by inflammatory stimuli, typically external as well.

Ankylosis occurs when the tooth root becomes directly fused to the surrounding alveolar bone, with the periodontal ligament space effectively lost. Because the root surface is resorbed and simultaneously new bone is laid down in its place, the tooth is gradually replaced by bone. This pattern is called replacement (substitution) resorption. The lack of a normal PDL means the tooth cannot maintain its separate attachment and is integrated into the bone over time.

External resorption would involve loss of root surface on the outer aspect, often from inflammatory or mechanical sources, not replacement by bone. Internal resorption starts within the pulp canal, not at the root-bone interface. Inflammatory resorption describes resorption driven by inflammatory stimuli, typically external as well.