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Volume 29 (1979 - 198･･･
- Issue 4 Pages 346-
- Issue 3 Pages 276-
- Issue 2 Pages 90-
- Issue 1 Pages 1-
Volume 29, Issue 4
Displaying 1-8 of 8 articles from this issue
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Satoaki SHIBATA, Kiyoshi NAGATA, Ryo NAKAMURA, Akira TSUNEMITSU, Akira ...1980 Volume 29 Issue 4 Pages 346-353
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThe binding of basic and proline-rich glycoprotein from human parotid saliva to S. mitis ATCC 9811 was specifically inhibited by D-galactose and sugars containing D-galactose residue at a non-reducing terminal, such as lactose and N-acetyllactosamine. By both the heating and trypsin treatment on cell surface, the binding ability was remarkably reduced.View full abstractDownload PDF (1216K) -
Yasuko KOBAYASHI, Masami OZEKI, Toshiharu YAGI, Tatsuoki HOSOI, Mitsur ...1980 Volume 29 Issue 4 Pages 354-360
Published: 1980
Released on J-STAGE: July 27, 2010
JOURNAL FREE ACCESSAs reported previously, the enamel surface of non-carious extracted human teeth were treated with 8% lanthanum nitrate solution (La solution), so that Ca2+ was displaced by La3+ in the enamel surface, and then the surface was coated with La3+.
The purpose of this study was to investigate the process of reaction and to discover its products.
After the synthetic hydroxyapatite (HAP) was treated with 0.01-8% La solution (pH 3.2-3.5) for 1-7 days, at regular intervals, the intake of La into HAP was analyzed by X-ray diffractometry.
The products of the lanthanum compounds were observed in HAP which was treated with 0.5-8% La solution, but this reaction did not appear in La solution of less than 0.1%.
This reaction was the displacement of Ca with La in HAP, which formed the lanthanum phosphate compounds LaPO4 and La4 (P2O7) 3.
The quantity of La in HAP reached about 20-26% and the amount of Ca was decreased, but the movement of P was small.
The higher the density of the La solution was, the more Ca was dissolved and the lower the density was, the more P was dissolved.
Lanthanum phosphate compounds were produced in the enamel surface of extracted human teeth which were treated with 8% La solution. The compounds included LaPO4, La4 (P2O7) 3, LaP5O14, LaHP2O7·3H2O, and LaP3O9·3H2O.View full abstractDownload PDF (927K) -
Ryoyu SHIMANO1980 Volume 29 Issue 4 Pages 361-377
Published: 1980
Released on J-STAGE: July 27, 2010
JOURNAL FREE ACCESSLanthanum inhibits dental caries in experimental animals. The question of how lanthanum is absorbed by the enamel surface still leaves much to be studied.
The items of this study were as follows:
1) the relation between the concentration and the time of action of lanthanum when it is absorbed by the enamel surface;
2) the concentration of lanthanum in experimental caries control and its distribution in internal organs when it is prescribed;
3) quantitative analysis of the three elements La, Ca, and P by electron probe X-ray microanalyser and X-ray fluoressent spectrometer;
4) various lanthanum phosphates in enamel surface seen by X-ray diffractometory.
An exchange reaction of Ca and La in enamel surface occurred when an extracted human tooth was dipped in lanthanum solution and the surface become coated with lanthanum phosphate (LaPO4).
After 3 days of immersion of a tooth in 2-8% of lanthanum solution, about 65% of the Ca was replaced and an equilibrium was reached. But in lanthanum solution of less than 1% replacement was slow, and in solution of 0.001% no reaction was detected.
The lanthanum compounds in the enamel surface were aciduric.
When lanthanum solution was given to a hamster, caries decreased clearly and 0.1%-0.01% of lanthanum solution (La: 312-31.2μg/ml) was most effective in preventing dental caries.
In an acute toxicity test, La was accumulated in all the internal organs when solution of more than 1.5% were used.
From this study I conclude that lanthanum fortifies the acid resistance of the teeth, that it is only slightly toxic, and that it is only slightly accumlated in internal organs.View full abstractDownload PDF (12379K) -
Katsuyoshi SHIROTO1980 Volume 29 Issue 4 Pages 378-387
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThis study was undertaken to find the relationship between the morphological characteristics of fissures and the prevalence and the extent of initial caries and to deduce the site of caries attack in the fissures of premolars extracted from orthodontic patients. The teeth were 124 premolars which appeared clinically sound, extracted from 61 children aged 8 to 15 years, and having electrical resistance values of above 600KΩ. Vertical bucco-lingual serial ground sections were prepared from each tooth and 835 sections were obtained.
The sections were observed by light and polarizing microscopy and by microradiography, and the size of fissures was measured using a profile projector.
The following results were obtained.
1. In the frequency of morphological characteristics, IK-type of fissures were 55, I-type 40, U-type 19, V-type 14, and other types 13 (Table 3).
2. In the prevalence of carious lesions, carious teeth were 54 out of 124 (43.5%), and carious fissures were 56 out of 141 (39.7%) (Table 5).
3. Regardless of morphological characteristics, all sites of carious lesions showed the same tendency: 56 (100%) were found at the outer third of the fissure, 55 (98.2%) at the fissure entrance, 47 (83.9%) at the middle third of the fissure, 34 (60.7%) at the inner third of the fissure, and 14 (25%) at the bottom of the fissure (Fig. 2, Table 6). From these findings, it was assumed that the main site of caries attack was probably at the outer third of the fissures.View full abstractDownload PDF (5349K) -
Report 1: Results of Survey in 1971 and 1972 (Including a Survey on Snacks)Mitsuharu TAKEUCHI, Mao-Yen PU, Tokio SHIMIZU, Takeo OHSAWA, Yoshikazu ...1980 Volume 29 Issue 4 Pages 388-397
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSAs an index for the estimation of oral environmental condition in a population, the annual sugar consumption per head (p) has been used by Takeuchi and his group. They observed that the curve of Cx (number of teeth newly attacked by caries during the post-eruptive tooth age x-year per initial 100 teeth) in the cohort survey on one kind of tooth at the time when p was roughly constant represented the most fundamental pattern of dental caries incidence. Furthermore, ΣCx (cumulative number of carious teeth up to the post-eruptive tooth age x-year per initial 100 teeth) at the time when p has been constant at 10, 20, or 30kg, could be profitable to evaluate the condition of caries prevalence with reference to the different level of p.
The present survey aimed at obtaining caries indexes for low sugar consuming population in order to make such a graph, at the same time assisting a public dental health program in the Republic of China.
The survey was conducted in some mountain farming villages, about 500m above the sealevel, where high quality tea and bamboo are producted, in Loo-Ku Song, Nantou Hsien, at 60-70km south-south-east of Taichung, Taiwan.
Oral examinations were made once a year in September from 1971 through 1977. The project was composed of three kinds of surveys: I: cross-sectional surveys of the 1st-6th grade pupils of primary school and 1st-3rd year pupils of junior high school in 1971 and 1972: II: cohort survey of the children who entered primary school in 1971 and 1972, continuing untill 1977; and III: cross-sectional surveys of 1st-6th grade pupils of primary school and 1st-2nd year pupils of junior high school in 1976 and 1st-6th grade pupils of primary school and 1st-3rd year pupils of junior high school in 1977 (Fig. 6).
The judgement of dental caries was made by WHO criteria for dental caries. Practically insignificant level fluoride was found in the drinking water of district. A survey on snacks taken between meals was conducted in the first year and 7th year.
The results of the surveys which were done in 1971 and 1972 were as follows.
1) The total number of the examinees in 1971 and 1972 was 6, 080.
2) Caries frequency of these children was shown in Table 2.
3) Average DMF score of these children was shown in Table 3.
4) The sugar intake through snacks was tabulated in Table 5. The average annual sugar intake per child was estimated to be approximately 7kg.View full abstractDownload PDF (4654K) -
Report 2: Results of Cohort Survey from 1971 to 1977Mitsuharu TAKEUCHI, Mao-Yen PU, Jin-Chan HSU, Tokio SHIMIZU, Takeo OHS ...1980 Volume 29 Issue 4 Pages 398-410
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThe aims and methods used in this study were the same as in Report 1. This report concerns with the cohort survey on two groups of children who entered primary school in 1971 and 1972 which was continued untill 1977.
The results were as follows.
1) The number of examinees were 457 of 1 st grade pupils of primary school in 1971 and 463 of 1st grade pupils of primary school in 1972, 920 children in total. The number of those used in analysing data were 358 and 367, respectively.
2) ΣCx (cumulative number of carious teeth up to the post-eruptive tooth age x-year per initial 100 teeth), Cx (number of teeth newly attacked by caries during the post-eruptive tooth age x-year per initial 100 teeth) and Mx (caries incidence rate of teeth during the post-eruptive tooth age x-year) by kinds of teeth were shown in Table 2.View full abstractDownload PDF (1471K) -
Hiroshi TANI1980 Volume 29 Issue 4 Pages 411-435
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThe dental health of 8, 672 school children, aged 6 to 14 years, resident in Hokkaido, Tokyo, and Okinawa was surveyed in 1977-1978. The purpose of this study was the comparison of caries prevalence of different areas in Japan.
Dental caries prevalence in these areas is shown in Figs. 1, 2, and 3. The children resident in Tokyo showed the best condition of dental health, and the children resident in rural areas in Hokkaido showed the poorest condition. The children in Hokkaido had many more carious teeth among the anterior teeth than Tokyo and Okinawa children, and about 20% of the children in the 2nd grade of middle school had cervical carious lesions in the frontal teeth. From the study of these age groups in seven locations, it was concluded that labial carious lesions among the anterior teeth appeared when the caries prevalence rate of anterior teeth reached about 20% in children.
A questionnaire on the frequency per day or week of drinking soft drinks and the frequency of daily tooth brushing was given to the 6th grade of primary school and to middle school children in Hokkaido. The children who more frequently drank soft drinks had a tendency to more carious teeth. The correlation between the frequency of daily tooth brushing and the dental caries prevalence was not clear in this study.
The sugar contents and pH of ten soft drinks were analyzed. Sucrose content of soft drinks ranged from 8.3 to 14.1 grams per 100 ml and glucose content was 0.13 to 3.42. The pH was between 2.5 to 3.5.
In addition to the results of the questionnaire, the annual survey of nutrition in Japan has suggested that recently, Hokkaido people drink more soft drinks than other Japanese people. I conclude that the caries prevalence and carious lesions of the anterior teeth are increased in Hokkaido as compared with Tokyo and Okinawa mainly due to the frequent use of soft drinks.View full abstractDownload PDF (5363K) -
1980 Volume 29 Issue 4 Pages 463
Published: 1980
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSDownload PDF (143K)
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