1년간 6세남아치열궁형태변화현상에 관한 연구

노인기,문혁수,백대일,김종배 대한구강보건학회 2000 大韓口腔保健學會誌 Vol.24 No.2

The purpose of this study was to obtain the data on the growth changes of dental arches of males, aged from 6 to 7 years, to make the dental arch growth prediction model. The eight measurements which were describing the dental arch morphology were obtained from the dental arch stone models of the 149 students in 1995 and of the same students in 1996. The dental arch forms were classified by the cluster analysis on the basis of the eight measurements. The growth changes of the dental arch during one year were compared among these classified arch forms. The obtained results were as follows : 1. The dental arches were classified into nine kinds of forms such as a long arrow short string middle arch with anteriorly located deciduous canine, a long arrow short string middle arch with posteriorly located deciduous canine, a longest arrow long string longest arch, a short arrow shortest string shortest arch, a middle arrow shortest string short arch, a shortest arrow middle string shortest arch, a long arrow longest string long arch, a middle arrow middle string middle arch and a middle arrow long string middle-arch. 2. The change of the length from the contact point of the upper right and left central incisors to the midpoint of the upper intercanine width was more lengthened than the rest seven measurements in all kind of arch forms. 3. There were significant differences in the growth change of the upper intercanine width among 9 arch forms. And, there were significant differences in the change of the length from the contact point of the upper right and left central incisors to the midpoint of the upper intercanine width among 9 arch forms. There were significant differences in the growth change of the length from the contact point of the lower right and left central incisors to the midpoint of the lower intercanine width among 9 arch forms, too. 4. The growth change of the upper intercanine width was similar to that of the lower intercanine width in all kinds of arch forms. 5. The growth change of the upper inter-first-molar width is similar to that of the lower inter-first-molar width in 8 arch forms except a long arrow longest string long arch form. 6. The growth change of the length from the contact point of the upper right and left central incisors to the midpoint of the upper intercanine width was similar to that of the length from the contact point of the lower right and left central incisors to the midpoint of the lower intercanine width in six arch forms except a longest arrow long string longest arch, a middle arrow shortest string short arch and a middle arrow long string middle arch. 7. The change of the length from the contact point of the upper right and left central incisors to the midpoint of the upper inter-first-molar width was similar to that of the length from the contact point of the lower right and left central incisors to the midpoint of the lower inter-first-molar width in four arch forms except a longest arrow long string longest arch, a short arrow shortest string shortest arch, a middle arrow shortest string short arch, a shortest arrow middle string shortest arch and a middle arrow middle string middle arch.

1년간육세남아치열궁형태변화현상에 관한 연구

노인기,문혁수,백대일,김종배 대한구강보건학회 1997 大韓口腔保健學會誌 Vol.21 No.5

아동치열궁주요구성거리의 6세이후 5년간변화에 관한 연구

노인기,문혁수,백대일,김종배 대한구강보건학회 2002 大韓口腔保健學會誌 Vol.26 No.4

This study was done to obtain data relating to the growth and development of dental arches in Korean primary school children during the five years after six year; of age, which were necessary to design the models for estimating the growth and developmental patterns of dental arches in Korean students. Since the eight lengths representing dental arch width and depth were measured on the stone dental arch models of 565 six year-old students residing in Yeoncheon-Gun county, Kyungki-Do province in 1995, they were longitudinally measured each year until the year 2000. The eight lengths representing dental arch width and depth were respectively measured on the stone dental arch models of 547 seven year-old students in 1996, 521 eight year-old students in 1997, 488 nine year-old students in 1998, 464 ten year-old students in 1999 and 442 eleven year-old students in 2000. Besides, 82 cephalometric distances and 54 cephalometric angles representing craniofacial depth and height were measured on the lateral cephalograms of 565 seven year-old students in 1996. According to the profile classification criteria reported by Lee and Moon^19), the profiles of 565 six year-old students were classified into seven profile groups, which were the upper neutral positioned lower retrognathic long profile group, the upper prognathic lower prognathic very long profile group, the upper retrognathic lower retrognathic middle profile group, the upper prognathic lower neutral positioned short profile group, the upper neutral positioned lower neutral positioned very short profile group, the upper neutral positioned lower neutral positioned very long profile group and the upper neutral positioned lower neutral positioned middle profile group. During the five years after six years of age since 1995, the changed eight lengths of dental arch width and depth representing the growth and development of dental arches were compared and discussed respectively in the seven profile groups. The obtained results were as follows ; 1. Upper inter-deciduous canine widths were continued to increase each year for two years after six years of age in all the male and female seven profile groups. However, they were continued to increase each year after eight years of age in all the other male and female profile groups except the male upper neutral positioned lower retrognathic long profile group and the male upper prognathic lower neutral positioned short profile group. 2. Lower inter-deciduous canine widths were continued to increase each year after six years of age in all the male and female seven profile groups. 3. Upper intermolar widths were continued to increase each year for five years after six years of age in all the other male and female profile groups except the female upper prognathic lower prognathic very long profile group. 4. Lower intermolar widths were continued to increase each year for five years after six years of age in all the other male and female profile groups except the male upper neutral positioned lower neutral positioned very short profile group, the female upper neutral positioned lower neutral positioned very short profile group, the female upper prognathic lower neutral positioned short profile group and the female upper neutral positioned lower neutral positioned middle profile group. 5. Upper deciduous canine depths were rapidly increased each year for two years after six years of age in all the male and female profile groups. However, they were continued to increase each year after eight years of age in all the other male and female profile groups except the male upper prognathic lower neutral positioned short profile group, the female upper neutral positioned lower retrognathic long profile group and the female upper neutral positioned lower neutral positioned middle profile group. 6. Lower deciduous canine depths were continued to increase each year after six years of age in all the other male and female profile groups except the female upper retrognathic lower retrognathic middle profile group and the female upper neutral positioned lower neutral positioned very short profile group. 7. Upper molar depths were slowly increased each year for four years after six years of age in all the male and female profile groups. However, they were decreased after ten years of age in all the male and female profile groups. 8. Lower molar depths were increased for one year after six years of age in all the male and female profile groups. However, they were increased for one year after seven years of age in all the other male and female profile groups except the male upper retrognathic lower retrognathic middle profile group, the male upper neutral positioned lower neutral positioned very short profile group and the male upper neutral positioned lower neutral positioned very short profile group. And, they were increased for one year after eight years of age in all the other male and female profile groups except the female upper retrognathic lower retrognathic middle profile group. But they were continued to decrease each year after nine years of age in all the male and female profile groups.

코발트 염의 첨가가 고무와 황동이 피복된 강선간의 접착에 미치는 영향

김민호,서곤,전경수,오세철,노인기 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.1

코발트 염의 첨가량을 달리하여 배합된 고무의 물성과 이 고무와 황동이 피복된 강선간의 접착특성을 조사하였다. 코발트 염의 첨가가 배합고무의 물성에 미치는 영향은 크지 않았으나, 접착특성은 코발트 염의 첨가량과 열화처리에 따라 크게 달라졌다. 코발트 염의 함량이 적은 고무에서는 pullout force와 고무의 부착 정도로 나타내어지는 접착특성이 향상되었으나, 함량이 1.5phr 이상인 고무에서는 열화 후 접착특성이 크게 나빠졌다. 코발트 염의 과량 첨가에 따른 접착특성의 저하를 접착층의 성장과 관련지어 설명하였다. The effect of cobalt salt in rubber compound on the physical properties of the rubber compound and the adhesion properties between the rubber compound and brass-coated steel cord was studied. Although the change in the physical properties of the rubber compound with the addition of cobalt salt was small, the adhesion properties were changed significantly with the loading level of cobalt salt and aging treatments. Pullout force and rubber coverage of the steel cord were enhanced in the rubber compound with low loading of cobalt salt. When the loading level of cobalt salt was higher than 1.5 phr, the adhesion was severely deteriorated after aging treatments. The easy failure in the adhesion of the sample with high loading of cobalt salt was explained in terms of the growth of the interfacial layer.

한국사람치아발거원인비중에 관한 조사연구

김종배,문혁수,백대일,노인기 대한구강보건학회 1998 大韓口腔保健學會誌 Vol.22 No.3

The purpose of this study was to evaluate oral health strategies in 1980s and 1990s and prepare the basic data for establishing oral health strategies in 21st century. The authors had examined oral diseases in 1995 and calculated the number of teeth indicated for extraction. The number of examinees was 3,000 which were composed of 5, 12, 15, 35-44, 65-74 age groups. The number of teeth indicated for extraction of other age groups were calculated from above 5 age groups. And the authors had calculated the percentage of extraction required by causes in Korea. The results obtained were as follows: 1. The percentage of extraction required by dental caries was 75.2%, periodonal disease was 21.2%, prosthodontic reason was 1.1% and other causes was 2.6% in 1995. 2. The percentage of extraction required by dental caries was decreased, but, periodonal disease was increased. 3. Also in the early 21st century, for reducing the number of extracted tooth due to dental caries and periodonal disease, the government authorities and people must try to conquer dental caries and periodonal disease cooperatively as well as individually. 4. The number of teeth for extraction was 7,899,841. Among them, the number of teeth indicated for extraction because of dental caries was 5,937,047, periodontal disease was 1,671,685, prosthodontic reasons was 86,889 and other causes was 204,220. 5. In order to prevent dental caries and periodontal disease, the Ministry of Health and Social Affairs must to establish and carry out a national policy for oral health.

코발트 염의 첨가가 고무와 황동이 피복된 강선간의 접착에 미치는 영향

김민호,오세철,서곤,전경수,노인기 한국화학공학회 1990 NICE Vol.8 No.3