Category: R
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Ranula
Forms in the floor of the mouth as a result of trauma or blockage of a salivary gland duct. It may be lined with epithelium. A ranula is mucus extravasation occurring in the floor of the mouth and usually associated with a sublingual gland. A small cyst under the tongue, on the floor of the…
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Radicular c
A cyst along the root of a tooth. Also known as an apical periodontal cyst.
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Radiographic
An estimate of the total amount of bone tissue (as bone mineral) in the path of one or more X‐ray beams, as measured by Hounsfield units. When in quotes, “density” is as defined in absorptiometry, and does not mean density as used in physics. Other classifications exist.
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Reverse a
When the crest of the interdental gingiva or bone is located apical to its midfacial and midlingual margins.
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Regional a
Local anesthesia of a regional body area.
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Residual a
Abscess produced by the residues of a previous inflammatory process.