Denture care in elderly, root caries is a core BDS — Emerging and Allied Areas concept in Dental (BDS). This guide explains what it is, walks through a fully worked example, and lists the key equations you need — with a short quiz to test yourself.

Key equations and worked example

A molar's crown is covered by enamel ~2.5 mm thick at the cusps — the hardest substance in the body. Beneath it lies dentin (softer, yellowish), and at the core the pulp with nerves and blood vessels. A cavity that stays in enamel can be filled simply; once it reaches the pulp, a root canal is needed. Drag the explode slider to peel the layers apart.

• <code>Enamel ≈ 96% hydroxyapatite mineral (hardest body tissue)</code>
• <code>Dentin ≈ 70% mineral — softer, supports enamel</code>
• <code>Pulp = nerves + blood vessels (tooth&#39;s living core)</code>
• <code>Implant osseointegration: titanium fuses directly with bone</code>

Denture care in elderly, root caries in detail

Denture care in elderly, root caries is one of the central ideas in BDS — Emerging and Allied Areas, and it appears in Dental (BDS) curricula under Geriatric Dentistry Basics. It is worth learning deeply because it connects to so many other topics in this section.

A tooth has a crown (above the gum) and roots (anchored in the jawbone). Enamel protects the crown, dentin forms the bulk, pulp keeps the tooth alive, and cementum covers the roots. Implants replace the whole tooth with a titanium screw fused to bone; braces move teeth by sustained gentle pressure; dentures replace full arches when teeth are lost.

For exams, the pattern is predictable: first a definition or statement of the result, then a direct numerical application of one of the equations above, then a "why" question — why the formula takes that form, or what changes when a variable is doubled or halved. The worked example and quiz below cover exactly that progression.

Quick self-check:

• Q: Name the three layers of a tooth from outside in.<br />A: Enamel → dentin → pulp.
• Q: Why does a deep cavity need a root canal instead of a simple filling?<br />A: Because decay has reached the pulp — the filling must remove the infected nerve tissue, not just the hole.
• Q: What makes a dental implant stay fixed in the jaw?<br />A: Osseointegration — bone cells grow onto the titanium screw surface, locking it in place.