Which statement about ankylosed primary molars is NOT true?

Ankylosed primary molars are characterized by a fusion of the tooth root to the surrounding alveolar bone, which leads to their immobilization and can affect dental arch development and the eruption of permanent teeth.

The statement that these teeth produce a "hollow" sound on tapping is not accurate. Instead, when ankylosed teeth are struck, they generally give a solid, metallic sound rather than a hollow sound. This characteristic arises from their firm attachment to the bone, as the breakdown of the periodontal ligament and the fusion of the tooth root to the bone create a different acoustic response compared to typical teeth.

In contrast, the other statements regarding ankylosed primary molars accurately reflect clinical considerations. The lower prevalence among African-American children might be based on genetic, environmental, or socio-economic factors. The consideration for extraction when they block the eruption of permanent teeth reflects a common dental practice to ensure proper dental alignment and development. Additionally, extracting them when no permanent counterpart is present can be essential for maintaining space and preventing complications. Together, these aspects contribute to effective management strategies for ankylosed primary molars in pediatric dentistry.