Abstract
A statistical survey on the current situation of a demand for orthodontic treatment, morphology of the maxillary alveolar arch and the cross biting condition was carried out on 532 cleft lip and/or palate patients (288 males and 244 females) who decided to receive their orthodontic treatment in the Orthodontic Clinic of Hiroshima University Dental Hospital from April 1968 to March 1989.
The results were as follows:
1. About 30 new patients with cleft had come to receive their orthodontic treatment in our clinic every year.
2. Half of the patients was from 6 to 8 years old at their first visit to our clinic.
3. The percentage of cleft patients was 10.7 % of all orthodontic patients in our clinic.
4. The ratio of male patients was larger than the female's.
5.77.3 % of the cleft patients lived in Hiroshima Prefecture, and half of them lived in Hiroshima City.
6.50 % of the introduced patients were from Hiroshima University Medical or Dental Hospital. And 50 % of all patients were introduced from the department of oral surgery or dentistry of a university or public hospital or private dental clinic.
7.50 % of the cleft patients had received their initial repair surgery at Hiroshima University Medical or Dental Hospital. And 45 % of all cleft patients had received their initial repair surgery at the department of otorhinology of a university or public hospital.
8. The incidence of each cleft type was as follows:
cleft lip (CL) 1.1 %, cleft lip and alveolus (CLA) 15.7 %, cleft lip and palate (CLP) 70.8 %, cleft palate (CP) 12.1 %, midline cleft 0.4 %.
9. The incidence of cleft site was as follows:
The left side cleft was most frequent and occupied 65.1 % of CLA patients and 49.9 % of CLP patients. The right side cleft occupied 30.1 % of CLA patients and 26.7 % of CLP patients, and the bilateral cleft occupied 4.8 % of CLA patients and 23.5 % of CLP patients.
10. The incidence of maxillary alveolar arch form was as follows:
1) In unilateral CLA patients, the butt-joint type amounted to 90.7 %.
2) In unilateral CLP patients, the butt-joint type amounted to 68.1 % and the collapsed type to 22.1 %.
3) In bilateral CLP patients, the butt-joint type amounted to 32.1 % and the protrusion type of premaxilla to 48.1 %.
11. The incidence of cross bite was 97.3 % of unilateral CLP patients,93.8 % of bilateral CLP patients and 91.4 % of CP patients.
