marginal groove

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mar·gi·nal groove

(mahrji-năl grūv)
Free gingival groove/shallow depression on outer surface of gingiva; separates free gingiva from attached gingiva.
References in periodicals archive ?
The deep channel, the marginal groove proper, is nearly enclosed by the projection of the ventral tips of the filaments over the groove.
Particles transported anteriorly inside the marginal groove proper are also embedded in a string of mucus (Figs.
(3) Still other particles appear to remain on the frontal surfaces of the filaments until reaching the tips, where they move laterally into the marginal groove proper through gaps between adjacent and opposing filament tips (Fig.
Because the superficial mucous string is sometimes opaque, we were unable to observe the marginal groove proper at all particle concentrations and types.