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Table 1 Coryllos’ classification of ankyloglossia

From: Lingual laser frenotomy in newborns with ankyloglossia: a prospective cohort study

Type of Frenulum

Upper Insertion

Lower Insertion

1

On tongue tip

On alveolar ridge

2

On tongue tip

Just behind the alveolar ridge

3

In the middle of the tongue

In the middle of the floor of the mouth

4

In the middle of the tongue

In the tongue base

  1. Coryllos’ classification of ankyloglossia recognizes four types of frenula based on the upper and lower insertions: type one has an attachment on the tip of the tongue and the other on the alveolar ridge; type two has the lower attachment on or just behind the alveolar ridge; type three has the frenulum extended from the middle of the tongue to the middle of the floor of mouth; type four is attached to the base of the tongue. The first and second types correspond to anterior ankyloglossia, whereas the third and fourth types (with functional impairment) correspond to posterior ankyloglossia