Pits & fissures are described as fossa & grooves that failed to fuse during development.

Pits & fissures are described as fossa & grooves that failed to fuse during development.

• A. True
• B. False
• C. Sometimes true
• D. Not described

Answer: (A)

Pits and fissures form where developmental grooves fail to fuse during tooth formation. As the enamel organ shapes the crown, adjacent grooves should coalesce to create smooth, continuous surfaces. When fusion is incomplete, narrow channels (fissures) remain, and at the ends of these grooves a pit can occur. This means pits and fissures are essentially fossa and grooves that did not fuse, which explains their characteristic narrow, deep anatomy and why they’re common sites for plaque accumulation and caries.

Pits and fissures form where developmental grooves fail to fuse during tooth formation. As the enamel organ shapes the crown, adjacent grooves should coalesce to create smooth, continuous surfaces. When fusion is incomplete, narrow channels (fissures) remain, and at the ends of these grooves a pit can occur. This means pits and fissures are essentially fossa and grooves that did not fuse, which explains their characteristic narrow, deep anatomy and why they’re common sites for plaque accumulation and caries.