Furcation
Pronunciation: fur-KAY-shun
The anatomical area where the roots of a multi-rooted tooth diverge from the tooth trunk, and the clinical assessment of bone loss in this region.
Full Definition
Furcation refers to the zone where two or more roots of a posterior tooth branch from the common root trunk. In periodontal assessment, furcation involvement describes the degree to which periodontal disease has eroded bone and soft tissue in this inter-radicular space. It is classified using systems such as the Glickman or Hamp classification (Classes I–III), with Class III indicating a through-and-through defect. Editors should note that 'furcation involvement' and 'furcation' are not synonymous: 'furcation' denotes anatomy, while 'furcation involvement' denotes a pathological finding. The term is distinct from 'furcation invasion,' a less preferred variant.
Usage
Usage note: Distinguish anatomical use ('the furcation of tooth 30') from clinical use ('furcation involvement'). 'Bifurcation' applies only to two-rooted teeth; 'trifurcation' to three-rooted teeth.
In Context
- "A Class II furcation was detected on the buccal of tooth 19, indicating partial bone loss into the inter-radicular space." — Periodontal assessment report
- "The report incorrectly labeled the furcation as a 'bifurcation' on a three-rooted molar — a factual error requiring correction." — Copy-editing review note