American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

What percentage of the root surface must be involved in replacement resorption for reverse ankylosis potential?

10%

15%

20%

For reverse ankylosis potential to arise, a significant involvement of the root surface by replacement resorption is necessary, which typically is defined as around 20%. When 20% or more of the root surface is involved in resorption, it indicates that the tooth is at a greater risk for reverse ankylosis. Reverse ankylosis is characterized by the loss of the periodontal ligament and a gradual fusion of the tooth root with the surrounding alveolar bone, leading to concerns with tooth stability and eruption. Consequently, understanding this threshold is important for orthodontic treatment planning and monitoring during the process of tooth movement.

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