undercut
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un·der·cut
(ŭn'dĕr-kŭt),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 that would prevent the insertion of a denture.
3. The contour of a flasking stone that interlocks in such a way as to prevent the separation of the parts.
undercut
1 the part of a tooth or artificial crown that lies between the height of contour and the gingivae, only if that part has a smaller diameter than the height of the contour.
2 the contour of a cross section of a residual ridge that would prevent the placement of a denture or other prosthesis.
3 the contour of flasking stone that interlocks so as to prevent the separation of parts.
4 the part of a prepared cavity that creates a mechanical lock or area of retention. It may be desirable in a cavity to be filled with gold foil or amalgam but is undesirable in a cavity prepared for a restoration to be cemented.
un·der·cut
(ŭn'dĕr-kŭt)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 that would prevent the insertion of a denture.
3. The contour of a flasking stone that interlocks in such a way as to prevent the separation of the parts.
un·der·cut
(ŭn'dĕr-kŭt)1. That portion of a tooth that lies between survey line (height of contour) and gingivae.
2. Contour of a cross-section of a residual ridge or dental arch that would prevent insertion of a denture.
3. Contour of a flasking stone that interlocks in such a way as to prevent separation of parts.
undercut,
n 1. the portion of a tooth that lies between its height of contour and the gingivae, only if that portion is of less circumference than the height of contour.
2. the contour of a cross-section of a residual ridge of dental arch that would prevent the placement of a denture or other prosthesis.
3. the contour of flasking stone that interlocks to prevent the separation of parts.
4. the portion of a prepared cavity that creates a mechanical lock or area of retention; may be desirable in a cavity to be filled with gold foil or amalgam but is undesirable in a cavity prepared for a restoration to be cemented.
2. the contour of a cross-section of a residual ridge of dental arch that would prevent the placement of a denture or other prosthesis.
3. the contour of flasking stone that interlocks to prevent the separation of parts.
4. the portion of a prepared cavity that creates a mechanical lock or area of retention; may be desirable in a cavity to be filled with gold foil or amalgam but is undesirable in a cavity prepared for a restoration to be cemented.
undercut gauge,
n See gauge, undercut.
undercut, retentive,
n an area of the abutment surface suitable for the location of a retentive clasp terminal, which in order to escape the undercut would be forced to flex and thus generate retention.
undercut, soft tissue,
n an undercut in a residual ridge or soft-tissue covering of a dental arch that would prevent or influence the placement of a removable denture.
undercut, unusable,
n the area of an abutment tooth or soft tissue across which a unit of the removable partial denture must pass without interference and hence must be blocked out (filled with wax or clay) before the master cast is duplicated. Use of a surveyor produces a surface that is parallel to the proposed path of a placement and removal.
undercut
in the preparation of a tooth cavity for restoration, a cavity under the edges of the opening which is intended to aid in retention of a filling.