Radiopacity
Pronunciation: ray-dee-oh-PAH-sih-tee
An area on a radiographic image that appears lighter or whiter than surrounding structures, indicating higher X-ray attenuation typically associated with dense materials such as enamel, bone, or metallic restorations.
Full Definition
Radiopacity describes the property of a material or tissue that absorbs or blocks X-rays, causing the corresponding area on a radiographic image to appear white or light gray. In dental radiology, radiopaque structures include enamel, dentine, cortical bone, amalgam restorations, metallic crowns, and calcifications. The adjective form is 'radiopaque,' and editors should use the noun and adjective forms consistently within a single document. 'Radiopacity' is never hyphenated and should not be confused with 'radiolucency,' its antonym. The term is also used to describe contrast agents injected to enhance visibility of structures.
Usage
Usage note: Use 'radiopacity' as the noun and 'radiopaque' as the adjective. Do not confuse with 'radiolucency.'
In Context
- "A focal radiopacity was noted in the periapical region of the mandibular right premolar, consistent with condensing osteitis." — Dental radiology report
- "The radiopacity of the amalgam restoration obscured the distal root of the first molar on the bitewing radiograph." — Clinical case study