Mindblown: a blog about philosophy.
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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…
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Ultrastructure
The detailed structure of a biological specimen that is beyond the resolution power of the light microscope, e.g., it may be observable using electron microscopes or technologies that provide greater resolution. The fine structure of tissues. It is visible only by use of electron microscopy.
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Ultrasound stimulation
Treatment modality traditionally used in physiotherapy to treat soft tissue disorders by deep heating tissues. It has been used with good results in treatment of fractures or delayed union and/or nonunions in extremities via a pulse sound wave at 1.5 MHz with an intensity of 30 mW per square cm. It does not seem to…
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Ultimate strength
The maximum stress a material can withstand at its point of rupture. Also known as ultimate tensile strength.
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Ulcer, ulceration
A lesion on the surface of the skin or mucosa characterized by discontinuation of the epithelium, deeper than erosion; exhibits gradual tissue disintegration and necrosis, usually with inflammation.
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UCLA abutment substand
An informal term used to describe a screw‐retained dental crown that is screwed directly into the implant body without an intervening abutment.
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UCLA abutment
Prosthetic implant component developed as a plastic castable pattern that can be modified by adding wax for custom shape and dimensions. This is a foundation for creating a cast‐to‐custom option. The component is screw retained directly into the implant, which circumvents the attachment screw.
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