| undercut | 1. That portion of a tooth that lies between the survey line (height of contour) and the gingivae. 2. The contour of a cross-section of a residual ridge or dental arch which would prevent the insertion of a denture. 3. The contour of a flasking stone which interlocks in such a way as to prevent the separation of the parts. (05 Mar 2000) |
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| undercut gauge | A device, used with a surveyor, to precisely locate areas for the placement of the retentive components of clasps when designing removable partial dentures. (05 Mar 2000) |