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.
undercut gauge,
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.
References in periodicals archive ?
Every now and again a model or an actress will pop up with an undercut as a supposedly dramatic new look - Yasmin Le Bon and Miley Cyrus being two examples.
Molders have developed a variety of methods for molding undercut or threaded parts--some as simple as unscrewing the part by hand or machining the undercuts in a separate operation--that range widely in cost-effectiveness and efficiency.
5 X 6-inch tray is fabricated with 11 undercuts of different heights and angles, which would normally prevent its removal from the tool.
military would fight hard and well but blindly, and the noble sacrifices of soldiers would be undercut by the lack of thoughtful leadership at the top.
Projected area, parting line, die block depth, undercuts, tolerance, heat flow, etc.
Rollers made in one piece have problems including undercuts at the flange that draw tape in or radiuses bend it out.
It even undercuts the Ford Ka, which is pounds 355 dearer in its most basic form.
It even undercuts the Ford Ka, which is pounds 355dearer in its most basic form while the cheapest Fiesta is almost pounds 2,000 more expensive.
The arms dealer undercuts prices on competitors in the United States, Germany and other countries.
The Republican leadership in Congress has sent a shameful message to the nation that undercuts our commitment to civil rights and equal protection of the law," said Sen.
The bill not only assumes a level of competence that the New Mexico debacle undercuts, it ignores a $5 billion maintenance backlog on lands the federal government already owns.
The 126-page draft study, which undercuts federal officials' contention that marijuana is carcinogenic, has never been published, though a panel of expert reviewers found in June 1994 that its scientific methods and conclusions were sound.