MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Dental X-ray held by a clip. This small X-ray shows an area of a few teeth, rather than the whole jaw. This helps to reduce exposure to the damaging effect of X-rays. The X-ray shows two teeth (here, molars) that have been filled with a dental filling (white). This is used to fill the cavity left after the drilling out of decayed tooth material. A third tooth (partially seen at bottom) has a screw implant holding an artificial crown in place. An X-ray such as this is used by a dentist to assess the condition of a patient's teeth and implants.
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