Category: U
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Uprighting
Tipping inclined teeth to a more normal vertical axial inclination.
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Upright
The vertical or normal position of a tooth. A growth habit whereby main branches grow more or less vertically.
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Unit load
The part of the total load on a bone, carried by a square unit of its crosssection or surface, that causes a corresponding strain and stress. It is arithmetically equal to the total load divided by the cross‐section area of the bone carrying it. Also load calculated as being applied to an individual implant within…
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Unilateral subperiosteal implant
An eposteal dental implant that provides for one or more abutments and that supports and/or retains a removable or fixed dental prosthesis on one side of a partially edentulous dental arch.
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Unilateral
Confined or relating to only one side; one sided. One-sided: all the organs developed on one side or all the organs turned to one side. Affecting only one side (e.g., unilateral paralysis, paralysis of only one side of toe body). Relating to or affecting one side of the body or one side of an organ…
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Uniform color space
If a color space is perceptually uniform, it means a change of length x in any direction of the color space would be perceived by a human as the same or an equal change.
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Undulate
Having an irregular, wavy border; used of a colony of microorganisms. With an edge or edges wavy in a vertical plane. Wavy perpendicular to the plane of the blade. Wavy; having a wavy border with shallow sinuses, said of bacterial colonies.
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Undercut
The portion of the surface of an object that is below the height of contourin relationship to the path of placement. The contour of a cross‐sectional portion of a residual ridge or dental arch that prevents the insertion of a dental prosthesis. Any irregularity in the wall of a prepared tooth that prevents the withdrawal…
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Uncovery
Popular term for the act of surgically exposing a submerged dental implant, following healing from stage one surgery.
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Ultraviolet
A wavelength of electromagnetic radiation that is shorter than the violet end of the visible spectrum but longer than that of X‐rays. Normally, it refers to wavelengths <380 nm. Wavelength of radiation that is shorter than visible light and often used for sterilization of some products. That portion of the electromagnetic spectrum with wavelengths between…