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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
Journal Basic Information
Journal DOI :
Korean Academy of Pediatric Dentistry
Editor in Chief :
Volume & Issues
Volume 1, Issue 1 - Jan 1974
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A STUDY ON THE RELATIONSHIP BETWEEN DENTAL CARIES PREVALENCE, AND THE CONTENT OF FLUORIDE IN DRINKING WATER, AND THE CONTENT OF FLUORIDE IN ENAMEL.
Paik, Tong-Jun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 9~17
The purpose of this study was to clarify the relationship between dental caries status, and the content of fluoride in drinking water, and the content of fluoride in enamel of deciduous teeth of Korean children. The specific areas selected in this study were Asan-Kun and Seouchon-Kun (Chung Cheoung Nam-Do) where the fluoride content in the deep well water were 0.9 ppm and 0.4 ppm respectively. The dental caries status of 720 children aged 6 to 11 who have been lived since birth was detected. The following results were obtained upon this study: 1. The def person rate, deft rate and def index of the Asan-Kun children were revealed 46.11%, 14.41% and 1. 69 respectively. The fluoride content in the outer layer of enamel was 430 ppm. 2. The def person rate, deft rate and def index of the Seouchon-Kun children were revealed 59.17%, 20.97% and 2.40 respectively. The fluoride content in the outer layer of enamel was 391 ppm. 3. The def person rate, deft rate and def index of the Asan-Kun children were showed lower value than the Seouchon-Kun children. The fluoride content of the outer layer of enamel of the Asna-Kun children were showed higher value than the Seouchon-Kun children.
STUDIES ON THE ROOT RESORPTION OF THE MANDIBULAR DECIDUOUS TEETH BY ORTHOPANTOMOGRAPHY
Rhee, Keung-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 19~29
Surveying the root resorption of the mandibular deciduous teeth in 967 children, (Male 493 Female 474) from 3 to 12 years old by orthopantomography, the author obtained the following results. 1) Female in the root resorption of the deciduous teeth was earlier than male. 2) The stages of initial resorption of the deciduous teeth were as follow. central incisor 4 years lateral incisor 4 years 2 months cuspid 6 years first decid uous molar 6 years second deciduous molar 6 years 5 months 3) The exfoliational stages (
) of the deciduous teeth were as follow. central incisor 6 years 8 months lateral incisor 7 years 2 months cuspid 9 years 10 months first deciduous molar 10 years 3 months second deciduous molar 11 years.
AN EXPERIMENTAL STUDY OF MASTICATORY EFFICIENCY ON SPACEMAINTAINER WEARERS
Lee, Keung-Ho ; Hwang, Eui-Kang ; Park, In-Ja ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 31~34
The author studied for the masticatory efficiency on the subject of 20 fixed spacemaitainer wearers and 20 removable spacemaintainer weares compared with the control group in children. The following results were obtained on 10 Mesh Screen. 1. The masticatory efficiency was 28.8% in removable spacemaintainer wearers. 2. On the subject of fixed spacemaitainer wearers, the masticatory efficiency was 27.4%. 3. The masticatory efficiency was 48.3% in control group.
STUDIES OF ERUPTION DEGREE ON PERMANENT SECOND MOLARS
Hwang, Eui-Kang ; Park, In-Ja ; Lee, Keung-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 35~39
505 girls were studied on the eruption of second molar clinically. 1. Eruption rate was 9.04% earlier in mandible than in maxilla. 2. Average age of eruption was 12.53 years old in maxilla and 11.73 in mandible. 3. There is no significant right and left arch, 4. Generally, period of eruption in Korean was slightly retarded as compared to that of foreigners.
THE ANNUAL COMPARISON OF DENTAL CARIES PREVALENCES OF "K" PRIMARY SCHOOL CHILDREN.
Kim, Myung-Soo ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 41~47
The dental caries survey of "K" primary school children was performed twice for one year interval and evaluated the transitional trend of dental caries prevalences. The number of children surveyed at the first year, 1973, was 819 boys and 653 girls; and the second year, 1974, was 815 boys and 661 girls aged 6 to 12. Under this survey, the following results were detected: 1. The average df person rate in deciduous teeth was increased by 7.52% in boy, 5.59% in girl and 6.65% of both. 2. The average df Index in deciduous teeth was increased by 0.13 in boy, 0.04 in girl and 0.1 of both. The average dt Index was decreased by 0.59 in boy, 0.64 in girl and 0.61 of both. The average ft Index was increased by 0.73 in boy, 0.68 in girl and 0.71 of both. 3. There showed no significant differences in DMF person rate between 1973 and 1974. 4. The DMFT Index of the permanent teeth was decreased by 0.19 in boy, and increased by 0.22 in girl. There showed no significant differences in both sexes between 1973 and 1974. The average DT Index was decreased by 0.43 in boy, 0.03 in girl and 0.31 of both. The average FT Index was increased by 0.23 in boy; 0.35 in girl and 0.29 of both. The average MT Index showed no significant differences in both sexes between 1973 and 1974.
AN ELECTROMYOGRAPHIC STUDY OF THE MASSETER MUSCLES IN CHILDREN WITH SPACE MAINTAINER
Ahn, Kyu-So ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 49~55
Electromyographic studies were performed on the action of the masseter muscles. Among the children aged from 6 to 8 years, ten children with normal occlusion and another ten with space maintainer were selected. The children were divided into 3 groups. They were: 1) A group: Children who removed space maintainer 2) B group: Children who inserted space maintainer 3) C group: Children with normal occlusion. The electromyogram was recorded with 4 channel polygraph. (Grass model VII) Electrodes which were cup-typed gold disks, 9 millimeters in the diameter, were located on the superficial layer of masseter muscles. The electromyogram was recorded in the physiologic rest position, molar occlusion, chewing movement, protraction, left lateral movement, and right lateral movement. The conclusions were as follows. 1. In the physiologic rest position, lateral movement, the electrical potentials of the masseter muscles were not changed clearly in each groups. 2. In molar occlusion, chewing movement, The electrical potentials of the masseter muscles of the B group were almost 10% higher than those of A group, and were almost 60-70% in comparision with C group. 3. In protraction, the electrical potentials of the masseter muscles of the B group were almost 40% higher than those of A group, and were almost equal to C group. 4. The electrical activities of the masseter muscles in the mandibular movements were in the following order: (1) Molar occlusion (2) Chewing movement (3) Protraction (4) Lateral movement.
EPIDEMIOLOGICAL STUDY ON DENTAL CARIES IN TWINS.
Jung, Tae-Ryun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 1, issue 1, 1974, Pages 57~61
The Study reported here was designed to analyze the prevalence of Dental Caries in the primary teeth of monozygote twins, and to ascertain and compare the intrapair differences with the intrapair differences in control pairs. The prevalence of dental caries in the primary teeth of 40 pairs of presumably monozygote twins, based on phenotypic analysis, was studied. The age range was from 3 to12 years. The control group consisted of pairs that included a twin chosen at random and an unrelated child of the same sex and age, so that for each pair of twins there was a corresponding control pair. The clinical examination was carried out by an operator using an oral mirror and sharp explorers, and with good lighting. 40 pairs of twins were examined with a total of 4,950 primary tooth surfaces (990 primary teeth) and 40 control pairs with a total of 4,935 primary tooth surfaces (987 primary teeth). Five surfaces were considered for each tooth. After the def individual index was determined, the ratio between this index and the number of examined surfaces was established in each case, the cer (Caries experience rate) index. The def and cer averages were determined for the subjects and the controls. All intrapair differences in twin and control groups were compared following the paired sampling method. The following conclusions were made: 1. Intrapair differences in the control group were significantly greater than in twins, when defs, ds, es, fs, and cer were compared. 2. The genotype appeared to be a determining factor in dental caries susceptibility or resistance, although the environment played an important role as well. 3. Intrapair differences in American children were significantly greater than in Korean when defs, es, fs, and cer were compared, but ds was equal.