Abstract
Statistical study was carried out on 338 patients with cleft lip and/or palate who were treated in the department of orthodontics, Osaka Dental University during the 10 years from April 1,1982 to March 31,1991. The following findings were obtained:
1. Cleft lip and/or palate patients accounted for 8.9% (338 cases) of all orthodontic patients (3,817 cases).
2.245 (72.4%) out of 338 cleft lip and /or palate patients lived in Osaka prefecture.
3. The patients consisted of 172 males and 166 females.
4. The age of patients at the first visit ranged from 2 to 33 years old and 75.1% of them were between 5 and 14 years old.
5.44.4% of the patients showed the developmental stage of IIIB.
6.55.0% of the patients were referred from family dentists.
7. The incidence of the type of cleft lip and/or palate was as follows: Unilateral cleft lip and palate; 190 cases (56.2%), bilateral cleft lip and palate; 69 cases (20.4%), unilateral cleft lip; 38 cases (11.3 %), cleft palate; 37 cases (10.9%), bilateral cleft lip; 3 cases (0.9%), and median cleft lip; 1 case (0.3 %).
8. The incidence of maxillary alveolar arch form was as follows:
1) The but-joint contact type accounted for 81.1%, the without contact type 12.3% and the overlap type 6.6% in unilateral cleft lip and/or palate patients.
2) The preamaxilla-projection type 68.1%, the but-joint contact type 22.3%, the premaxilla-climination type accounted for 8.3%, and the premaxilla-retraction type 1.3% in bilateral cleft lip and/or palate patients.
9. Type of malocclusion in the patients was as follows: crowding; 74.9%, mandibular protrusion; 55.9%, and cross bite; 51.4%.
10. The delivery age mothers ranged from 19 to 42 years old, and the average age was 27.9 years old.
11.49.4% of the patients were first-born children.
