Anatomical features of Gingiva:

Three parts:

Marginal: Extends from the gingival margin to the free gingival groove.
Unattached to the tooth. 
Width about 1.0mm. 
It is smooth, not stippled
keratinized or parakeratinized.

 
Attached: Extends from the free gingival groove to the mucogingival junction. 
Firmly bound down to the alveolar bone and cementum of tooth.  
Stippling is usually present. 
Width varies between 1.0 & 9.Omm.  
Keratinized or parakeratinized.

 
Interdental: Occupies the interproximal space beneath the area of tooth contact (embrasure space). 
Central portion is usually stippled but the marginal borders are smooth.
Includes parts of marginal & attached gingiva. 
Pyramidal in shape in the anterior region. But forms a "col" in the premolar/molar region.

Width of attached gingiva:

Range: 1.0 - 9.Omm on the facial aspect, the greatest width is in the incisor regions and least in the 1st premolar area.
 
On the lingual aspect of the mandible it is narrow in the incisor region and wide in the molar region.
 
On the palatal aspect the attached gingiva cannot be distinguished from the palatal mucosa.
 
The width of attached gingiva Increases with age and with supraeruption of teeth.

The gingival sulcus:

definition: 
A shallow fissure between the marginal gingiva and the enamel or cementum. It is bounded by the tooth surface on one side, the sulcular epithelium on the other and the coronal end of the frictional epithelium at its most apical point.

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