Glickman+Furcation+Classification


 * Grade I:** No horizontal bone loss. Probe only catches.

**Grade II:** Horizontal bone loss but not through and through

**Grade III:** Probe passes through and through but not seen clinically

**Grade IV:** Through and through seen clinically

**__ More details: __**
In 1953, ** [|Irving Glickman] ** graded furcation involvement into the following four classes: [|[2]]
 * //Grade I// - Incipient furcation involvement, with any associated [|pocketing] remaining [|coronal] to the alveolar bone; primarily affects the [|soft tissue] . Early bone loss may have occurred but is rarely evident [|radiographically].
 * //Grade II// - There is a definite horizontal component to the bone loss between roots resulting in a [|probeable] area, but bone remains attached to the tooth so that multiple areas of furcal bone loss, if present, do not communicate.
 * //Grade III// - Bone is no longer attached to the furcation of the tooth, essentially resulting in a through-and-through tunnel. Because of an angle in this tunnel, however, the furcation may not be able to be probed in its entirety; if cumulative measurements from different sides equal or exceed the width of the tooth, however, a grade III defect may be assumed. In early grade III lesions, soft tissue may still occlude the furcation involvement, though, making it difficult to detect.
 * //Grade IV// - Essentially a super grade III lesion, grade IV describes a through-and-through lesion that has sustained enough bone loss to make it completely probeable.