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A notch in the labial flange of a denture at the point where it crosses the frenum.
See also: notch
Medical Dictionary, © 2009 Farlex and Partners
la·bi·al notch(lābē-ăl noch)
An indentation placed in the flange of a denture base to accommodate the labial frenum.
Medical Dictionary for the Dental Professions © Farlex 2012