RESUMEN
The study assessed proportions of clefts in patients visiting orthodontic unit of Children's Hospital Lahore from 24-01-2000 to 24-01-2007. This observational descriptive study included 313 subjects comprising 189 males and 124 females with the age range of day one to 13 years. The method used for this study was Kernahan's modified double 'Y' with numeric coding. A total of 30 combinations were used to describe all types of clefts. The data was analyzed using SPSS 12. An increased proportion of the male patients [189] was examined compared to 124 females. The most common finding was complete bilateral cleft affecting 126 cases [40.3%]. The second common type was complete unilateral cleft seen in 95 patients [30.4%]. The clefts involving the left side were more common and were identified in 54 patients [17.3%]. The 3[rd] largest type was cleft involving median soft palate. An unusual finding of this study was complete unilateral and partial clefts of the opposite side found in 21 infants [6.7%]. The most common finding was complete bilateral cleft of the lip and palate. An unusual type of cleft was identified with Kernahan's double 'Y'