Abstract
Clinical statistical analyses were performed on patients with cleft lip and/or palate (CL/P) at the Orthodontic Clinic of Kyushu University Hospital from August 1970 to December 2012.
The results of analyses were as follows:
1. The number of CL/P patients during the 43 years studied was 1,844 (973 males and 871 females), and accounted for 10.02% of the total number of patients registered at the Orthodontic Clinic.
2. The age of new patients at our clinic ranged from zero years old to 45 years old. The most common age of beginning treatment at our clinic was three years old.
3. The types of cleft lip and/or palate were distributed into four categories, with 53.9% having cleft lip and palate, 20.1% with cleft palate, 19.3% with cleft lip and alveolus, and the remaining 6.7% having cleft lip.
4. Most of the CL/P patients lived in Fukuoka prefecture, especially Fukuoka city and its neighboring towns.
5. Arch form in the patients with unilateral cleft lip and palate (UCLP) was classified according to the Pruzansky and Aduss classification, with 21.2% falling into the overlap type, 70.6% into the contact type, and 8.2% into the free type.
6. Cross-bite type in UCLP patients was classified into six types: type 1 at 26.7%, type 2 at 43.1%, type 3 at 4.2%, type 4 at 9.5%, type 5 at 10.9%, and type 6 at 5.6% using Kohno’s method.
7. The mean scores of occlusal evaluation were 3.09 using the Five-Year-Olds’ index for primary dentition, and 2.90 using the Goslon Yardstick in late mixed dentition.
