Radiopacity
A bright white area on a dental radiograph representing structures that absorb or block X-rays, such as enamel, metallic restorations, or calcified tissue.
Full Definition
Radiopaque structures appear white or light gray on radiographic images because they absorb most of the X-ray beam before it reaches the detector or film. Enamel is the most radiopaque natural tooth structure, followed by dentine and cementum. Metallic restorations, calculus, and impacted foreign bodies also appear radiopaque. In clinical reports, radiopacity is used as a descriptive term for both normal anatomy and pathological calcifications such as sialoliths or pulp stones. Editors should note that the adjectival form 'radiopaque' is preferred in most style guides over 'radioopaque'.
Usage
Usage note: Preferred adjectival form is 'radiopaque', not 'radioopaque'. Confirm spelling when editing radiography sections.
In Context
- "A well-defined radiopacity was evident within the pulp chamber, consistent with pulp calcification." — Radiographic report
- "The amalgam restoration produced significant radiopacity, obscuring the underlying dentine margins." — Clinical case study