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Angularis nigra, Latin for 'black angle', also known as open gingival embrasures, and colloquially known as "black triangle", is the space or gap seen at the cervical embrasure, below the contact point of some teeth. The interdental papilla does not fully enclose the space, leading to an aperture between adjacent teeth. [1]
Healthy gums fill and fit each space between the teeth, unlike the swollen gum papilla seen in gingivitis or the empty interdental embrasure seen in periodontal disease. Healthy gums hold tight to each tooth in that the gum surface narrows to "knife-edge" thin at the free gingival margin. On the other hand, inflamed gums have a "puffy" or ...
Diagram showing embrasure (red triangle) between maxillary right second bicuspid and maxillary right first molar. Right lateral view. In dentistry, embrasures are V-shaped valleys between adjacent teeth. They provide a spill way for food to escape during chewing [1] which essentially aids in the self-cleansing process.
The interdental papilla, also known as the interdental gingiva, is the part of the gums (gingiva) that exists coronal to the free gingival margin on the mesial and distal surfaces of the teeth. The interdental papillae fill in the area between the teeth apical to their contact areas to prevent food impaction; they assume a conical shape for the ...
The gingival tissue forms a crevice surrounding the tooth, similar to a miniature, fluid-filled moat, wherein food debris, endogenous and exogenous cells, and chemicals float. The depth of this crevice, known as a sulcus , is in a constant state of flux due to microbial invasion and subsequent immune response.
The border created by these two dental tissues has much significance as it is usually the location where the gingiva (gums) attaches to a healthy tooth by fibers called the gingival fibers. [ 2 ] Active recession of the gingiva reveals the cementoenamel junction in the mouth and is usually a sign of an unhealthy condition.
In dental anatomy, the gingival fibers are the connective tissue fibers that inhabit the gingival tissue (gums) adjacent to teeth and help hold the tissue firmly against the teeth. [1] They are primarily composed of type I collagen , although type III fibers are also involved.
When a tooth has very deep periodontal pockets it may not be possible to fully remove the dental plaque/tartar/calculus from the tooth's root surface with scaling alone. In open flap debridement (OFD) the gum is peeled back to make it possible for the dentist to see and ensure full removal of tartar/calculus from these difficult to access areas ...