Category: U

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.  

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…

The maximum stress a material can withstand at its point of rupture. Also known as ultimate tensile strength.  

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.  

An informal term used to describe a screw‐retained dental crown that is screwed directly into the implant body without an intervening 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.  

Try‐in of a ceramic or metal‐ceramic restoration to evaluate contour, color, occlusion, and proximal contact tightness. The try‐in is completed prior to the application of the final ceramic glaze to minimize the need for final adjustments and to create as optimal a restoration as possible.  

An instrument vibrating in the ultrasonic range (approximately 25 000–30 000 cps) which, accompanied by a stream of water, can be used to remove adherent deposits from teeth. A device that uses high-frequency vibration to remove stains and adherent deposits on the teeth.