TI : The study of impacted and supernumerary teeth in young man by the full mouth roentgenograms
AU : Ahn HK
AD : Department of Dental Radiology, College of Dentistry, Seoul National University
SO : JKAMFR. 1977;7(1):5-8
PY : 1977
LA : KOREAN
CP : KOREA
AB : The author has observed 906 full mouth roentgenograms in Korean young man who had the impacted and supernumerary t eeth.
Impacted and supernumerary teeth were analysed upon several items, such as incidences and positions in the dental arch .
The results were as follows;
1. The incidences of impacted teeth were 59.05%, and the ratio of upper jaw to lower one was 1:3.
2. The frequency of the supernumerary teeth were 5.52%, and the ratio of maxilla to mandible was 49:1.
3. No significant differences between right and left side in both jaws, but incidence rate of the supernumerary teeth w as 74% in the maxillary central incisor area.
4. The positions of impacted and supernumerary teeth were vertical and inverted shapes in maxilla, whereas horizontal a nd mesio-angular forms in mandible.