CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of human tooth enamel, the highly mineralised covering of the crown of a tooth (the crown is the part of the tooth that projects above the gums). Enamel is an extremely hard, translucent substance composed of parallel rods (or prisms) of highly calcified material cemented together by an equally hard, calcified substance. The prisms are arranged perpendicular to the surface of the enamel. Magnification: X600 at 8x8 inch, X86 at 35mm size.
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