Stillman Clefts and McCall Festoons: Slits and Rolled Margins in Gum Tissue

Described by Dr. Paul Stillman in 1921, a Stillman cleft is a narrow, vertical, slit-like indentation extending from the marginal gingiva down toward the root apex. It often looks as if the gum has been sliced cleanly with a razor blade or paper cut.

Clefts can be simple (a single straight vertical split) or compound (where the fissure branches or exhibits ragged edges). They most frequently occur on the facial surfaces of canines, premolars, and lower incisors. If left unmanaged, the cleft deepens until it penetrates through the mucogingival junction, exposing the root completely.

Stillman’s clefts present as narrow, vertical slit-like fissures extending apically from the gingival margin along the root surface. McCall’s festoons manifest as exaggerated, life-preserver-like rolled enlargements of the marginal gingiva circling the cervical neck of the tooth.

Described by periodontist J.O. McCall, a McCall festoon is an exaggerated, rounded, lifesaver-shaped enlargement of the marginal gingiva. Instead of tapering to a fine, knife-edged margin against the enamel, the gum tissue rolls into a distinct, swollen rim.

Festoons most commonly affect the facial surfaces of mandibular premolars and canines. While they may appear inflamed and red, festoons in health can be pale pink and fibrous. They represent the body's attempt to reinforce a gingival collar subjected to chronic mechanical friction or heavy biting forces.

Both clefting and festooning represent localized soft-tissue reactions to chronic mechanical trauma, such as aggressive fingernail picking or severe occlusal trauma. The localized micro-tears disrupt normal microcirculation, creating characteristic indented clefts or thickened fibrous collars.

Historical periodontics blamed clefts and festoons almost exclusively on "occlusal trauma" (bite interference). Modern periodontal science recognizes a multifactorial triad: biomechanical bite forces create micro-strain at the cervical margin, which is then exacerbated by aggressive toothbrush scrubbing and bacterial plaque accumulation.

Treating Stillman clefts requires removing the causative trauma: adjusting high bite interferences, breaking fingernail picking habits, and switching to ultra-soft brushes. For deep, open clefts, periodontal plastic surgery—such as a connective tissue graft or coronally advanced flap—is performed to close the fissure and restore smooth marginal continuity.

Resolution requires completely eliminating the underlying traumatic stimulus through occlusal adjustment or habit cessation therapy. Once mechanical trauma is removed, shallow clefts often resolve spontaneously, while deep clefts may be surgically repaired using soft-tissue grafting.

Stillman's clefts and McCall's festoons are classic clinical morphological manifestations of localized mucogingival pathology. A Stillman's cleft is a narrow, slit-like vertical indentation or fissure extending from the gingival margin apically along the root surface.

In contrast, McCall's festoons appear as distinct, doughnut-shaped or rolled, exaggerated enlargements of the marginal gingiva, most commonly observed around the labial surfaces of canines and premolars. Both lesions are often triggered by heavy occlusal trauma combined with aggressive horizontal toothbrushing.

Under excessive mechanical force, the marginal vascular plexus undergoes localized thrombosis. In thin phenotypes, the ischemic tissue collapses into a sharp cleft, whereas in thicker phenotypes, the tissue responds with hyperplastic fibrous enlargement (festooning).

Resolving Stillman's clefts and McCall's festoons requires identifying and eliminating the underlying mechanical trauma before attempting soft-tissue surgery. When occlusal interferences or clenching habits are detected, precision occlusal adjustment and custom nightguard therapy are implemented immediately.

Simultaneously, the patient's brushing technique is adjusted to gentle sulcular cleansing with extra-soft filaments. In early or mild cases, eliminating trauma allows the cleft to spontaneously re-epithelialize and shallow over several months.

However, if the cleft persists, extends to the mucogingival junction, or causes plaque stagnation, surgical connective tissue grafting is performed to re-establish a continuous, harmonious marginal architecture and seal the exposed root.