2005 Volume 30 Issue 3 Pages 259-269
A statistical and sequential study was performed in 329 patients with cleft lip and palate in the Department of Orthodontics, Aichi-Gakuin University Dental Hospital, in the past 20 years from 1983 to 2002. Observation of the generation divided a document for 20 years into five groups (Group 1: 1983-1987, Group 2: 1988-1992, Group 3: 1993-1997, Group 4: 1998-2002), and each group was compared. The results were as follows:
1. The number of pa tients with cleft lip and palate was 329, accounting for 6.7% of all orthodontic patients. The patients were 172 males and 157 females with a male to female ratio of 1:0.9.
2. Cleft morphology was classified as follows: Unilateral cleft lip and palate was observe d in 41.0%, bilateral cleft lip and palate in 16.4%.
3. The peak age in the initia l diagnosis was 8 years (20.4%). The patients between 6 and 9 years old occupied 55.6%.
4. The ave rage value of ANB angle was higher in unilateral cleft lip and palate and cleft palate.
5. The patients with crossbite were 88.4%. The patients with crossbite involving the ante rior and bilateral buccal segment was 67.3% in Group 1, however the proportion in Group 4 decreased.
6. The patients who had congenitally missing teeth accounted for 68.2% of the patients with cleft lip and palate. Congenitally missing teeth of the maxillary lateral incisor on the left side were found in 29.6% of the patients and on the right side in 23.1%. The side on which there were congenitally missing teeth watched the cleft side.
7. The preferred orthodontic appliance was the Porter arch type of expansion appliance, accounting for 40.8% in Group 1, and 50.0% in Group 4. As the external anchorage appliance for improving skeletal problems, the chincap was used mainly in Group 1, and the maxillary protracter in Group 4.
