The distributions and trends in maloclusion patients - A 10 year study of 2155 patients from YDSH

Baik, Hyoung Seon; Kim, Kyung Ho; Park, Yul

Abstract

Distributions and trends were examined in 2155 malocclusion patients who had been examined and diagnosed at Department of Orthodontics in Youngdong Severance Hospital over a 10 year-period from 1984 to 1993. The results were as follows; 1. The number of patients per year had nearly quadrupled during the 10 year-period, with females(58.3%) outnumbering males(41.7%). 2. Age distribution had shown 7-12 year-old group being the largest(53.3%), but percentages of 7-12 year-old and 13-18 year-old groups had been decreasing while that of above-19 patients had gradually increased. 3. Distributions in the types of malocclusion according to the Angle's Classification had shown: 27.8% for Class I, 22.6% for Class II division 1, 7.9% for Class II division 2, and 41.6% for Class III. Percentages of Class I patients had decreased while percentages of Class II and III patients had increased. 4. Non-extraction cases (75.4%) had outnumbered extraction cases (24.6%), with a general trend toward fewer extraction cases over the 10 year period. 5. Patients who had orthognathic surgery had been increasing, with Class I, II, and III cases comprising 8.8%, 16.9% and 74.3%, respectively. There had been three times as many 2-jaw operations as 1-jaw operations. 6. Nearly 4% of the subjects had facial asymmetries, with Class III cases being the most frequent. 7. Patients with TMD symptoms comprised 4.6%, with an increasing trend. The symptoms had occurred more frequently in older patients and in females. 8. Geographic distributions showed majority (3/4) of patients from the nearby areas, namely Gangnam-gu, Seocho-gu and Songpa-gu.