Gingival fibers

The gingival fibers are the connective tissue fibers that inhabit the gingival tissue 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.

These fibers, unlike the fibers of the periodontal ligament, in general, attach the tooth to the gingival tissue, rather than the tooth to the alveolar bone.

Functions of the gingival fibers

The gingival fibers accomplish the following tasks:^[1]

They hold the marginal gingiva against the tooth
They provide the marginal gingiva with enough rigidity to withstand the forces of mastication without distorting
They serve to stabilize the marginal gingiva by uniting it with both the tissue of the more rigid attached gingiva as well as the cementum layer of the tooth.

Gingival fibers and periodontitis

In theory, gingival fibers are the protectors against periodontitis, as once they are breached, they cannot be regenerated. When destroyed, the gingival sulcus (labelled G in the diagram) increases in depth apically, allowing more debris and bacteria to remain in intimate contact with the delicate sulcular and junctional epithelia for longer times.

Types of gingival fibers

The gingival fibers, (H), extend from the cementum (B) into the attached gingiva. Some fibers extend coronally into the crest of the free gingiva, some horizontally, and still other extend horizontally over the crest of the alveolar bone, (C), and then apically to connect on the facial aspect of the buccal plate of the alveolar bone.

There are three groups within which gingival fibers are arranged:

dentogingival group - there are three types of fibers within this group:
- fibers that extend towards the crest of the gingiva
- fibers that extend laterally to the outer surface of the gingiva and
- fibers that extend outward, past the height of the alveolar crest, and then downward along the cortex of the alveolar bone.
circular group - these fibers are unique in that they exist entirely within the gingiva and do not contact the tooth
transseptal group - these fibers have traditionally been described as spanning the interproximal tissue between adjacent teeth, into which they are embedded.^[1] However, two other types of fibers have been described in this group:^[1]
- semicircular fibers - fibers that run through the facial and lingual gingiva around each tooth, attaching to the interproximal surfaces of the same tooth.
- transgingival fibers - fibers that run between two non-adjacent teeth and are embedded in the cementum of their proximal surfaces, passing around the tooth in the middle of the two teeth attached with these fibers.

References

1 2 3 4 Itoiz, ME; Carranza, FA: The Gingiva. In Newman, MG; Takei, HH; Carranza, FA; editors: Carranza’s Clinical Periodontology, 9th Edition. Philadelphia: W.B. Saunders Company, 2002. pages 26-7.

Dentistry involving supporting structures of teeth (Periodontology)

Anatomy

Disease

Diagnoses	Chronic periodontitis Localized aggressive periodontitis Generalized aggressive periodontitis Periodontitis as a manifestation of systemic disease Periodontosis Necrotizing periodontal diseases Abscesses of the periodontium Combined periodontic-endodontic lesions

Infection	A. actinomycetemcomitans Capnocytophaga sp. F. nucleatum P. gingivalis P. intermedia T. forsythia T. denticola Red complex

Other	Calculus Clinical attachment loss Edentulism Fremitus Furcation defect Gingival enlargement Gingival pocket Gingival recession Gingivitis Horizontal bony defect Linear gingival erythema Occlusal trauma Periodontal pocket Periodontal disease Periodontitis Plaque Vertical bony defect

Treatment and prevention	Periodontal examination Ante's law Brushing Bleeding on probing Chlorhexidine gluconate Flossing Hydrogen peroxide Mouthwash Oral hygiene Tetracycline Triclosan Host modulatory therapy

Treatment

Conventional therapy	Debridement Scaling and root planing Full mouth disinfection Full mouth ultrasonic debridement

Surgery	Apically positioned flap Bone graft Coronally positioned flap Crown lengthening Open flap debridement Gingival graft Gingivectomy Guided bone regeneration Guided tissue regeneration Enamel matrix derivative Implant placement Lateral pedicle graft Pocket reduction surgery Socket preservation Sinus lift Subepithelial connective tissue graft Tools Curette Membrane Probe Scaler

Important personalities

Other specialties

Endodontology
Orthodontology
Prosthodontology

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