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KMID : 0380319700050000083
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Journal of Korean Research Institute for Better Living
1970 Volume.5 No. 0 p.83 ~ p.99
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A Statistical Study of Loss of the Teth and Replaced Rate of College Students of Ewha Womans University in Korea
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Abstract
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This project is proposed to measure the dental needs of Korean college girls and to calculate their dental needs as a part of a follow up study of student dental health control program.Prevalence of dental caries,DMF teeth,DMF index,and the related informations were presented in Vol.3 of this journal,previously,in 1969.
Among 5,354 students,number of students who hed experienced in teeth extraction were 1,995,and their missing data were calssified into three categories; those were,
1. "required cases"(missings and required prosthetic works including required reconstruction works which needed to recover their lost functions),
2. "replaced cases"(missings but permanently replaced with prosthodontic works such as fixed or removable bridges and partial dentures), and
3. "no needed cases"(missings, but no prosthetic works required,in cases of orthodontic treatment, or third molars,or no spaces due to early loss of permanent teeth, etc.)
1) 37.25% of the students,1,995 among 5,354, hed experiened in one or more teeth extractions.
2) Analyzing the subject by the number of missing teeth,50.62% of them had one missing tooth,30.48% had two missing teeth,9.87% had three,and 5.31% had four missing teeth.Five or more took 3.72%.The poorest one had eleven missing teeth.
3) Average missing teeth per student had increased according to age; from 18 to 22,those were 0.55,0.63,0.70,0.72,and 0.77.Average number of missing teeth of this subject were 0.69±1.22.It included 5.26% of root fragments.
4) THE "required cases"in this study,43.79% of the missing teeth did not replaced.Actual required cases which excluded no needed cases,had shown as 58.03%. In short,required cases were predominated approximately to replaced cases. The ratio was 3:2.
5) The "replaced cases"were stayed in 31.67%. Actual replaced cases hold 41.97%.
6) The "no needed cases"were formed nearly a quarter(24.54%).Excluding the third molars,it would be 20.55%.
7) The orders of individual teeth of the required cases and the replaced cases were different each other except the lower first molars which kept the first place.
8) Compared with upper and lower jaws:
in the missing teeth, the ratio was 33.99 : 66.02 (appoxmately 1:2);
in the required cases,the ratio was 26.25 : 73.75 (appoxmately 1:3);
in the replaced cases,the ratio was 35.70 : 64.30 (appoxmately 1:2).
In a word,lower figure of required cases of uppres was due to high rate of replacement of upper anteriors.
9) The replaced rate of molars which were responsible in mastication was comparatively low while anteniors showed high rate.Those were,27.57% for upper first molars,5.00% for upper second molars,42.10% for lower first molars.and10.86% for lower second molars.And,for anterors,87.07% for upper central incisors,78.91%of upper lateral incisors and 71.87%of lower central incisors.
10) Increasing the age,the replaced rate of uppers had shown increased while its of lowers had reduced.
11) To compare the rights and the lefts in each case,there were no sighificant differences even the lefts were little predominant.
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