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 ?
The amount of undercut required to pull a molded sprue out of its bushing depends on no less than six different variables, many of which are not often taken into consideration during the mold-design stage:
5 This stiffness gives a measure of the force required to remove the impression from the undercut areas in the mouth.
In this situation, two separate undercuts that should be addressed by only one slide are identified during the dexelization process.
The roller barrel is slightly shorter than the tape width and the effect is to create the same undercut as before.
Undercut: Undercut the lowest price by unless [less than or equal to] , then raise the price to ,
Threaded caps illustrate well the complexities associated with undercuts.
We can make complicated molds in one piece without worrying about undercuts or drops.
The system, developed by Takao Injection Mold Engineering, offers exceptional design flexibility to OEMs and mold designers, says the company, by allowing application designers to incorporate undercuts into their designs that are twice as deep as previously possible.
They confine this admission, which undercuts their whole case, to a note at the end of the book.
A company that undercuts its competitors by a full pounds 5 if you see cheaper.
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.
Calling these persons refugees is demeaning and undercuts their humanity.