1. That part of a tooth cavity that provides an area of resistance to withdrawal or removal of a restoration. It is a desirable feature for an amalgam restoration but is undesirable for cast restorations.
2. That portion of a tooth surface that lies between the gingival margin and the height of contour of the tooth. It is an area in which a prosthetic clasp arm may engage to provide resistance to displacement.
3. The contour of a cross-section of an alveolar ridge that would prevent the vertical placement of a denture or appliance. The depth of undercut can be measured with an undercut gauge.
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