. Descriptive anatomy of the human teeth . guo-gin-gival ridge, or cingulum, is also begun as a separate plate, form-ing the lingual lobe, but afterward it becomes united to theother parts by confluence, leaving a groove, often very slight,indeed, and soon obliterated by wear, marking the line ofunion. This is the linguo-gingival groove (e, £?), (Thisgroove is properly three grooves corresponding with the mesial,central, and distal grooves of the bicuspids, while the linguo-gingival ridge corresponds to the lingual cusp. See Par. 41.)In smooth regularly formed teeth it begins at the gingival l
. Descriptive anatomy of the human teeth . guo-gin-gival ridge, or cingulum, is also begun as a separate plate, form-ing the lingual lobe, but afterward it becomes united to theother parts by confluence, leaving a groove, often very slight,indeed, and soon obliterated by wear, marking the line ofunion. This is the linguo-gingival groove (e, £?), (Thisgroove is properly three grooves corresponding with the mesial,central, and distal grooves of the bicuspids, while the linguo-gingival ridge corresponds to the lingual cusp. See Par. 41.)In smooth regularly formed teeth it begins at the gingival linejust lingual of the summit of its labio-lingual curvature, andruns across the marginal ridge at right angles with its length,then runs almost horizontally across the lingual surface to thedistal marginal ridge. This ridge is now crossed at right angles,and the gingival line reached. The length of the groove usuallyincludes from a quarter to a third of the circumference of thetooth. When the linguo-gingival ridge is prominent, or rises.
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