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

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 ?
Many of the computer makers have vowed that they would not buy the components from Hon Hai unless the company would undersell its products by at least 20%.
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So it is rare that we see a book title like this one, which undersells its subject, describing the dispute over the firing of white educators by a local black school board in Ocean Hill-Brownsville in Brooklyn as one that "changed New York.
He undersells moments that flirt with sentiment and lets loose when the action demands.
I think Stein undersells this field and what we know, by a lot," says psychologist Janice Kiecolt-Glaser of Ohio State University in Columbus.
It undersells what is a stunningly spectacular show that appeals to all ages.