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<p>tissue as it can undergo mineralization changes.</p>

<p><big> Structure </big></p>
<p>The basic unit of enamel is called an <a href="page.php?w=enamel_rod">enamel rod</a>. Measuring 4-8&nbsp;<a href="page.php?w=Micrometre">um</a> in diameter, an enamel rod, formally called an enamel prism, is a tightly packed mass of <a href="page.php?w=hydroxyapatite">hydroxyapatite</a> crystallites in an organized pattern. In cross section, it is best compared to a keyhole, with the top, or head, oriented toward the crown of the tooth, and the bottom, or tail, oriented</p><p>
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