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March 17, 1956


JAMA. 1956;160(11):977. doi:10.1001/jama.1956.02960460055013

Some degree of cleft lip and palate occurs in about one in every 850 live births. There is a wide difference, however, in reports of incidence, and the apparent increasing incidence may merely reflect more accurate statistics, the effect of laws requiring the reporting of all congenital anomalies, or a greater number of conceptions resulting in live births.1 Canick2 classifies cleft lips as (1) simple, in which there is a unilateral cleft without an associated cleft of the maxilla; (2) complete cleft of lip and maxilla; and (3) incomplete cleft, with bridging between both edges of the cleft; and cleft palates as those involving (1) the soft palate only, (2) the hard and soft palate and extending no further than the incisive foramen, (3) the hard and soft palate and alveolar arch of the maxilla on one side—usually associated with unilateral cleft lip, and (4) the hard and