Korean J Orthod.  1979 Dec;9(1):39-65.

A study on the irregularities of teeth in malocclusion

• Roh TR

Abstract

The purpose of this study was to investigate the pattern of irregularities of irregularities of teeth in various malocclusion groups. The subjects consist of 803 out-patients(355 males, and 488 females) in department of Orthodontics of S.N.U. Hospital, Yonsei University, and Kyunghi University Hospital. The results were as follows. 1. The proportions of subjects on the basis of Angle's Classification were 39.2%(42.2% male, and 57.8% female) in class I malocclusion, 29.0%(44.6 male, and 55.4% female) in class II. div.1, 3.5%(46.4% male, and 53.6% female) in class II. div. 2., 28.3%(46.3% male, and 53.7% female) in class III. 2. Considering all the subjects, the percentage of teeth crowding was 67.8%(45.0% male, and 55.0% female). In class I malocclusion, the percentage of Crowding was 70.8%(43.5% male, and 56.5% female) with higher ferquency in upper anterior teeth than in lower anterior. 3. The percentage of Maxillary anterior diastema was 25.6%(45.6% male, and 54.5% fermale)on the whole. In class II. div. 1. malocclusion, the percentage was 28.8%(46.7% male, and 53.7% female) and in class III, the percentage was 19.8%(46.7% male, and 53.3% female). Thus, frequency of maxillary anterior distema, was comparatively higher in class II. div. 1. than in class III. 4. The percentage high canine was 25.1%(53.2% male, and 46.8% female) on the whole, and was 86.0% male and 76.6% female in right side, 73.0% male and 72.3% female in left side. In class II. div. 2., the percentage was 53.6%(46.7% male, and 53.3% female). In class II. div. 1., the percentage was 16.7%(46.2% mle, and 53.8%) with higher frequenecy in class II. div. 2. 5. The percentage of deep overbite was 23.0%(43.2% male, and 56.8% female) on the whole. In class II. div. 2., and in clas sll. div. 1., its were 89.3%(48.0% male, and 52.0% female), 54.5%(40.9% male, and 59.1% female) respectively. This result can be considered as ane of the characterics of Angle's class II malocclusion group. 6. The percentage of spacing was 23.0%(36.8% male, and 63.2% female) on the whole, In class II. div. 1., and in class II. div. 2., its were 26.1%(44.3% male, and 55.7% female), 7.1%(50.0% male, and 50.0% female) respectively. 7. The percentage of open bite was 14.3%(43.6% male, and 57.4% female) on the whole with higher rate on the anterior part. It rated 17.6%(50.0% male, and 50.0% female) in class III, but none in class II. div. 2. 8. The percentage of crossbite was 22.5%(55.8% male, and 44.2% female) on the whole, with higher ferquency on the acterior part than on the posterior part. In Angle's class III, it rated as much as 55.1%(57.6% male, and 42.4% female). 9. The percentage of edge-to-edge bite was 20.4%(47.6% male, and 53.4% female) with higher frequency on anterior part than on posterior part. 10. The percentage of irregulaities of teeth in various malocclusion groups, was 21.5%(24.8% maxillary, and 18.1% mandible) in crowding, 20.8%(23.5% maxillary, and 18.0% mandible) in rotation, 10.7%(10.6% maxillary, and 10.8% mandible) in cross bite, 9.5%(11.8% maxillaty, and 7.3% mandible) in spacing, 8.5%(8.5% maxillary, and 8.5% mandible) in edge-to-edge bite, 8.1%(8.3% maxillary, 7.8% mandible) in open bite. Crowding teeth, spacing teeth, and rotation teeh were more prevalent in anterior part than in posterior part. Cross bite teeth and edge-to-edge bite teeth were more prevalent in class III malocclusion than in another.

MeSH Terms

Crowding
Diastema
Female
Humans
Male
Malocclusion*
Open Bite
Orthodontics
Overbite
Tooth*