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Table 6 Classification of cleft lip and cleft palate malformations:

From: Oral cleft prevention program (OCPP)

Group I Pre-incisor foramen clefts (Clefts lying anterior to the incisor foramen). Clefts of the lip with or without an alveolar cleft.
  a) Unilateral  
  Right Total – when they reach the alveolar arcade
  b) Bilateral Partial
   1) Total}On one or both sides
   2) Partial
  c) Median 1) Total
   2) Partial
Group II. Trans – incisor foramen clefts (Clefts of the lip, alveolus and palate)
  a) Unilateral Right
  b) Bilateral  
Group III. Post-incisor foramen clefts (Clefts lying posterior to the incisor foramen)  
  1) Total  
  2) Partial  
Group IV. Rare facial clefts  
  1. Taken from Division of Plastic Surgery and Burns of the Department of Surgery of the University of Sao Paulo Medical School, Brazil (Spina et al., 1972).