| ULN | upper limit of normal |
|---|---|
| ULV | upper limit of vulnerability |
| UMN | upper motor neurone |
| URI | upper respiratory tract infection |
| universal numerical notation for teeth | <dentistry> The universal numerical notation is an alternative numerical notation for teeth. In this notation, your upper right third molar is designated as tooth#1, and then you number each tooth sequentially moving right to left and down across your mouth. (08 Jan 1998) |
|---|---|
| flared teeth | <dentistry> A term used to indicate the position of the teeth. The upper teeth are flared lingually (toward the lip). (08 Jan 1998) |
| fluoridated teeth | <dentistry> Teeth exposed to fluorine salts during odontogenesis. (05 Mar 2000) |
| fused teeth | Two teeth united during development by the union of their tooth germs; the teeth may be joined by the enamel of their crowns, by their root dentin, or by both. (12 Dec 1998) |