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 ?
These conditions require a larger amount of undercut.
The stiffness of this material dictates that it will recover less after removal from undercut areas compared with other tested products.
Undercuts are molded along the bottom perimeter and rear of the parts to attach the housing to a metal base plate without fasteners, reducing secondary operations and improving cosmetics.
Going to war for faulty reasons undercuts everything that follows, especially when those who made the mistakes stubbornly refuse to acknowledge them.
When you get about one-third of the way toward the undercut, you should notice the kerf getting slightly bigger.
aid for the past three years, Karzai has sprit the ethnic opposition, undercut the most dangerous warlord, and built a coalition that ran a winning campaign.
The Italian government has demanded that 40 foreign airlines raise their fares so as not to undercut Alitalia which has just received a rescue loan backed by the government.
In previous attempts to solve the problem, methods to find feasible parting direction, undercut and parting line location were investigated with little success.
There is a 1-piece roller with a small corner radius, a 1-piece roller with a corner undercut, and a 3-piece roller with a spring loaded flange.
I get Harris's desire to undercut narration, to remove emotion, psychology front this poem.
FIAT's new Panda supermini will massively undercut its rivals when it goes on sale next month.
Furthermore, he expanded his global gag rule, undercut family planning and reproductive health services, and supported ideologically driven restrictions on funding for organizations working with women in prostitution.