auxiliary abutment

aux·il·ia·ry a·but·ment

a tooth other than the one supporting the direct retainer, assisting in the overall support of a removable partial denture.

aux·il·ia·ry a·but·ment

(awg-zilyă-rē ă-bŭtmĕnt)
Any tooth other than the one supporting the direct retainer, assisting in the overall support of a removable partial denture.