| threshold shift | Measurement of the degree of hearing loss or impairment in terms of a decibel shift from an individual's previous audiogram. (05 Mar 2000) |
|---|---|
| permanent | Continuing or enduring (as the same state, status, place) without fundamental or marked change: not subject to fluctuation or alteration: fixed or intended to be fixed: lasting, stable. (18 Nov 1997) |
| permanent callus | The callus which has become converted into osseous tissue. Synonym: permanent callus. (05 Mar 2000) |
| permanent cartilage | Cartilage that is not replaced by bone. (05 Mar 2000) |
| permanent dominant idea | An exaggerated notion, belief, or delusion that persists, despite evidence to the contrary, and controls the mind, the obstinate conviction of a psychotic person regarding the correctness of his delusion. Synonym: idee fixe, overvalued idea, permanent dominant idea. (05 Mar 2000) |
| permanent pedicle flap | A pedicle flap in which the pedicle is not severed at the time of transfer, so that it continues to supply blood from the donor site to the recipient area. (05 Mar 2000) |
| permanent restoration | A definitive restoration, in contradistinction to a temporary or provisional restoration. (05 Mar 2000) |
| permanent section | A technique in which a thin slice of biopsy tissue is mounted on a slide to be examined under a microscope by a pathologist in order to establish a diagnosis. (09 Oct 1997) |
| permanent stricture | A stricture due to the presence of cicatricial or other new tissue, not spasmodic. Synonym: permanent stricture. (05 Mar 2000) |
| permanent tooth | One of the 32 teeth belonging to the second or permanent dentition; eruption of the permanent teeth begins from the fifth to the seventh year, and is not completed until the seventeenth to the twenty-third year, when the last of the wisdom teeth appears. Synonym: dens permanens, dens succedaneus, second tooth, secondary dentition, succedaneous dentition, succedaneous tooth. (05 Mar 2000) |
| dental restoration, permanent | A restoration designed to remain in service for not less than 20 to 30 years, usually made of gold casting, cohesive gold, or amalgam. (12 Dec 1998) |
| dentition, permanent | The 32 teeth of adulthood that either replace or are added to the complement of deciduous teeth. (12 Dec 1998) |
| antigenic shift | Mutation, i.e., sudden change in molecular structure of RNA/DNA in microorganisms, especially viruses, which produces new strains of the microorganism; hosts previously exposed to other strains have little or no acquired immunity to the new strain; antigenic shift is believed to be the explanation for the occurrence of strains of microorganisms, such as the influenza virus, associated with large scale epidemics. (05 Mar 2000) |
| antigen shift | Abrupt change in antigens expressed by a species or variety of organisms. Usually seen in microorganisms where the change may allow escape from immune recognition. Antigenic drift is a more gradual change. See: antigenic variation. (18 Nov 1997) |
| axis shift | Deflection of the electrical axis of the heart to the right or left of the normal. See: left axis deviation, right axis deviation, axis. Synonym: axis shift. (05 Mar 2000) |