When designing a denture base minor connector, the maxillary extension should extend as far posteriorly as is practical, and the mandibular extension should be what fraction of the residual ridge?

When designing a denture base minor connector, the maxillary extension should extend as far posteriorly as is practical, and the mandibular extension should be what fraction of the residual ridge?

• A. 2/3
• B. 1/3
• C. 1/2
• D. 3/4

Answer: (A)

Extend the mandibular minor connector about two-thirds of the residual ridge. This length provides enough area on the ridge to give support and stability to the denture base while avoiding excessive coverage of movable mucosa or interference with border movements. Extending only one-third would undercut stability, while half is less optimal but acceptable; extending three-quarters or more risks impinging on soft tissues and limiting functional movement. So two-thirds strikes the best balance for retention and tissue health.

Extend the mandibular minor connector about two-thirds of the residual ridge. This length provides enough area on the ridge to give support and stability to the denture base while avoiding excessive coverage of movable mucosa or interference with border movements. Extending only one-third would undercut stability, while half is less optimal but acceptable; extending three-quarters or more risks impinging on soft tissues and limiting functional movement. So two-thirds strikes the best balance for retention and tissue health.