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Volume 37 (1987)
- Issue 5 Pages 620-
- Issue 3 Pages 220-
- Issue 2 Pages 106-
- Issue 1 Pages 2-
Volume 37, Issue 5
Displaying 1-14 of 14 articles from this issue
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Nobuhiro HANADA, Hideo MIYAZAKI, Keiko GOTO, Akira SOGAME, Toshiyuki S ...1987 Volume 37 Issue 5 Pages 620-624
Published: 1987
Released on J-STAGE: October 27, 2010
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Hideo MIYAZAKI, Miyuki ITOH-ANDOH, Toshiaki SAITO, Akira SOGAME, Keiko ...1987 Volume 37 Issue 5 Pages 625-629
Published: 1987
Released on J-STAGE: October 27, 2010
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Yoshiaki TOMOBE, Junko ENDO, Daisuke HINODE, Reiko MAEHARA, Atsushi NA ...1987 Volume 37 Issue 5 Pages 630-636
Published: 1987
Released on J-STAGE: October 27, 2010
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Setsuo HAMADA, Tohru KAWASAKI1987 Volume 37 Issue 5 Pages 637-644
Published: 1987
Released on J-STAGE: October 27, 2010
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Hideo MIYAZAKI, Miyuki ITOH-ANDOH, Yoshihisa YAMASHITA, Toshiaki SAITO ...1987 Volume 37 Issue 5 Pages 645-649
Published: 1987
Released on J-STAGE: October 27, 2010
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Kazusada YOSHITAKE, Tadashige MORI, Gaku YAMAMOTO, Takao ABE, Masahiro ...1987 Volume 37 Issue 5 Pages 650-658
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSOral and dental diseases among 1, 315 employees of a financial institution in Shiga Prefecture were examined by dentists. Each number of F-teeth, D-teeth, M-teeth and DMF-teeth was counted. The influences of such factors as sex, age, periodontal disease, calculus, malocclusion, and tooth brushing were determined quantitatively by the quantification analysis I.
The average number of teeth of each type per person was as follows: F-teeth 6.45 for males and 8.57 for females, D-teeth 3.29 and 2.41, M-teeth 1.37 and 1.49, and DMF-teeth (DMFT) 11.47 and 12.48, respectively. The number of F-teeth was greatly influeced by the place of employment, sex, and age. Yokaichi and Imazu-Kinomoto showed an increase in the number of F-teeth. The average number of F-teeth per person decreased above 40 years of age in males, and above 50 years of age in females.
The greatest influence on the number of D-teeth was the place of employment. Imazu-Kinomoto showed an increase in the number of D-teeth, and Minakuchi and Yokaichi showed a decrease. Age had the strongest influence on the number of M-teeth. Both the extent of increasing the number of M-teeth, and the average number of M-teeth per person bacame larger with age. Above 50 years of age, the average number of M-teeth per person remarkably increased. The average number of DMF-teeth per person was also greatly influenced by age. The DMFT plotted by age showed a J-curve for males and a reversed L-curve for females.
Periodontal disease, calculus, and malocclusion had scarcely influenced on the number of F-, D-, M-, and DMF-teeth. However, the influence of the tooth brushing on the number of D-teeth and M-teeth showed a linear correlation.View full abstractDownload PDF (1686K) -
(I) Fluoride DistributionKazuo KATO1987 Volume 37 Issue 5 Pages 659-668
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThis study was undertaken to reveal the changes in the fluoride distribution in the developing enamel of rat upper incisors with varying fluoride administration. The work was carried out on four groups of Wistar rats, which received water containing 0, 25, 50 and 100 ppm fluoride, respectively, for 10 weeks. Six sites were selected in the developing enamel, corresponding to the stages of (A) matrix formation, (B) early maturation, (C) late maturation, (D) pigmented enamel in contact with alveolar bone, (E) enamel attached to gingivae and (F) erupted enamel. Five different enamel specimens were removed from each site except site A. The fluoride distribution in each specimen was analyzed from the enamel surface to the EDJ.
The following results were obtained;
1) The fluoride concentration was invariably highest at the surface and decreased sharply towards the interior of the enamel at every site in both control and experimental groups. The rat incisor enamel had a clear fluoride-gradient from surface to interior.
2) The fluoride concentration increased with fluoride intake throughout the tissue and at each stage of development.
3) The fluoride-gradient curves resembled each other at the different sites of tooth development. However, the fluoride concentration of the enamel interior was significantly higher at site B than it was at the other four sites.View full abstractDownload PDF (2048K) -
(II) Dissolution Rate of Enamel in AcidKazuo KATO1987 Volume 37 Issue 5 Pages 669-676
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThis study was undertaken to determine the changes in the dissolution rate of enamel in acid at different developmental stages of rat incisor enamel. Four groups of Wistar rats received water with 0, 25, 50, and 100ppm fluoride, respectively, for 10 weeks. Six windows were prepared on the enamel surface of the maxillary incisors, corresponding to the developmental stages of (A) matrix formation, (B) early maturation, (C) late maturation, (D) pigmented enamel against alveolar bone, (E) enamel attached to gingivae, and (F) erupted enamel. The acid dissolution rates were determined at each site using a slightly modified version of the procedure described by Nakagaki (J. Dent. Hlth 28; 498-518, 1979).
The results are summarized as follows.
1) The rate of enamel dissolution in every group was the highest in the matrix formation stage and decreased as the enamel developed.
2) The acid dissolution rate of enamel dropped sharply in a stepwise fashion between sites A and B and then again between sites C and D.
3) The dissolution rate at sites B and C in the maturation stage decreased significantly with increasing intake of fluoride.
4) The dissolution rate at sites D and E, where enamel was pigmented, increased significantly with fluoride intake. The iron pigmentation and porosity in this region of fluorosed enamel might be responsible for the change in the dissolution rate of the pigmented enamel.View full abstractDownload PDF (3441K) -
I. Tooth-brushing habits and periodontal condition evaluated by CPITNKoji KONISHI, Kenji KUSUNOKI, Yoshifumi IWAMOTO, Tatsuo WATANABE, Ryo ...1987 Volume 37 Issue 5 Pages 677-687
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe present investigation was designed to develop effective dental health practices in adults at their place of work. Their periodontal condition was examined by CPITN, and the relationships between it and their brushing habits, frequency of dental examination, and subjective symptoms of their gingiva were determined in both male and female subjects. The results are as follows:
1. Females needed less dental treatment of their periodontal tissues than males; the difference was statistically significant in the age groups of 30-40 and 45-65.
2. In all age groups, females brushed their teeth more times daily than males: females brushed an average of over three times daily, and few of them brushed less than once daily. The difference between females and males was statistically significant. The frequency of daily brushing by all of the adults in the present survey was higher than that found by the Ministry of Health and Welfare dental disease survey conducted in 1981.
3. In all age groups the periodontal condition was better in subjects who brushed three times a day than in those who brushed only once daily. These results suggest the importance of good tooth-brushing habits for a good periodontal condition.
4. Employees in businesses that provided frequent dental examinations had healtheir periodontal tissues than those in businesses that provided only one dental examination. This tendency was the same even when the data were categorized by sex or region.
5. There was a relationship between the condition of periodontal tissues and subjective symptoms of gingiva obtained from questionaires. The periodontal tissue of participants who described subjective gingival symptoms was in worse condition than that of those who never felt any gingival abnormality, and the difference in periodontal condition between the two groups was significant.
These findings suggest that dental health practices conducted regularly are important for adults.View full abstractDownload PDF (1851K) -
Youichi IIJIMA, Yoshinori TAKAESU, Daisuke INABA, Masato MIYAZAWA, Mit ...1987 Volume 37 Issue 5 Pages 688-696
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSAn epidemiological survey on the prevalence of dental fluorosis and measurement of fluoride concentration in drinking water has been performed in natural fluoride areas, in Kitatsugaru since 1974. The region of Kitatsugaru is located at 40°45', north latitude; the annual mean temperature is 9.6°C and annual mean maximum temperature is 14.1°C. Dental fluorosis is caused by excessive intake of fluorides during calcification of teeth. Therefore, the relationship between the occurrence of dental fluorosis and fluoride concentration in the drinking water, which the subjects had been drinking since birth, was evaluated. 248 elementary school children in 3 areas, from age 6 to 9, were examined. The severity of fluorosis was examined by an experienced examiner and recorded according to the WHO classification (1971).
Thirty-seven deep wells in natural fluoride areas of Kitatsugaru were divided into 7 groups, according to their fluoride concentrations (Mean±S. D.): Group I, 0.34±0.04 ppm; Group II, 0.64±0.13 ppm; Group III, 0.95±0.19 ppm; Group IV, 1.72±0.20 ppm; Group V, 2.50±0.52 ppm; Group VI, 1.01±0.95 ppm; and Group VII, 1.15±0.61 ppm. Coefficients of variation (C. V.) of fluoride concentration from Group I to V were stable within about 20%, but unstableness of C.V. was found in Group VI and VII.
The moderate [MO] and severe [S] types of dental fluorosis were not found in natural fluoride areas, in Kitatsugaru. A mild type [M] of dental fluorosis was first observed in Group III and increased from 4.6 to 25.0% to the maximum level of Group V, with the increasing fluoride concentration of the water. Community fluorosis indices of each fluoride concentration group were as follows: Group III, 0.33-negative zone; Groups IV and V, 0.86 and 0.88-higher than borderline zone, respectively; Group VI, 0.25-negative zone; and Group VII, 0.50-borderline zone.
The percentage of school children having nonfluoride enamel opacities was less than 5% in natural fluorides areas in Kitatsugaru. On the basis of the severity of dental fluorosis and CFI, the optimum fluoride concentration in drinking water in this area appears to be 0.9 ppm.View full abstractDownload PDF (1888K) -
Akihito TSUTSUI, Kin-ichi HORII, Seigo KOBAYASHI, Tatsuo HIMENO1987 Volume 37 Issue 5 Pages 697-703
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSA community dental health program was conducted in Maki Village (population was about 5, 000), Niigata Prefecture, for 10 years from 1974.
This community dental health program consists of two parts: (1) fluoride mouth rinsing in nursery, elementary and junior high school and (2) detection and immediate treatment of initial caries extending the treatment from the children in low grades to those in high grades.
In 1975, the Association of Dental Health for Children was organized for promoting this program in Maki Village.
A comparison of caries prevalence was carried out among school children at baseline (1974), 5 years after (1979) and 10 years after (1984) in Maki Village, and the caries prevalence of school children in Maki Village (1984) was compared with that in Village S (1984). The school children in Village S had not used fluoride mouth rinsing.
The results were as follows.
1) In Maki Village, mean DMF teeth per children of the elementary and junior high school children was 3.67 (SE=0.11) in 1974, 1.93 (0.10) in 1979, and 0.93 (0.06) in 1984. Caries reduction rate was 75 % for 10 years, and this was highly significant statistically.
The percentage of school children without carious teeth increased from 13 % in 1974 to 56% in 1984, and the percentage of school children with some decayed teeth was only 6% in 1984.
2) The caries prevalence of the school children in Maki Village was lower than that in Village S. The difference of the percentage of children with DMF teeth and of mean DMF teeth was 35% and 69%, respectively.
The good dental health in Maki Village was the result of the 10-year community dental health program of school-based fluoride mouth rinsing, and detection and immediate treatment of caries.
The continuation of this program was supported by the Association of Dental Health for Children.View full abstractDownload PDF (2999K) -
Changes Caused by Ca-EDTA Administration and Lead Concentrations in Parotid Saliva of Lead-Exposed WorkersMasanori HASHIMOTO, Ikutaro INAMORI, Yoshio MIZUNO, Masao NISHIMURA1987 Volume 37 Issue 5 Pages 704-712
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIt has been noted by some investigators that lead is present in human parotid saliva, but there are no data on lead concentrations in parotid saliva of lead-exposed workers.
This report describes the changes caused by Ca-EDTA administration and lead concentrations in parotid saliva of lead-exposed workers.
The results were as follows:
1) The distribution of lead concentrations in parotid saliva of lead-exposed workers was approximately logarithmic-normal.
2) The geometric mean of lead concentrations in parotid saliva of lead-exposed workers was 0.617 μg/dl.
3) Significant correlation was observed between the lead in plasma and parotid saliva (r=0.628) and the lead in blood and parotid saliva. The mean ratio of the lead concentrations in simultaneously obtained parotid saliva to plasma was 0.792.
4) Lead concentrations in parotid saliva reached a maximum at 1 to 3 hours after Ca-EDTA administration and the rate of increase was 70-80%.
5) Lead in parotid saliva had a molecular weight of approximately 15, 000, and it seems possible that lead binds to salivary proteins.View full abstractDownload PDF (1830K) -
Masato MIYAZAWA, Youichi IIJIMA1987 Volume 37 Issue 5 Pages 713-720
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe aim of this study was to evaluate the distribution of tooth color by using the color difference (CIE1976L*a*b*) between standard material (white board) and subjects. We analyzed the color of sound upper central incisors by using a colorimeter (BM-5, TOKYO OPTICAL CO., LTD JAPAN).
Eighty-one young adults (aged 22-30 years, 81 teeth) and 103 children (aged 7-15 years, 103 teeth) were examined (Total 184 subjects).
Sixteen cases of discolored teeth and 30 cases of enamel opacity (white spot, dental fluorosis) were included.
The results were as follows.
1. The distribution of color differences in the total cases of normal teeth color groups in adults and children showed a normal distribution curve in goodness of fit tests of normality (p<0.05).
2. The mean of color differences in all subjects was 23.9 in enamel opacity, 34.9 in normal teeth, and 48.9 in discolored teeth. Differences among all means were statistically significant (p<0.05) according to the Newman-Keuls test. A similar statistical significance was obtained in children (p<0.05), and in adults significant differences were found between discolored teeth and normal teeth, discolored teeth and enamel opacity.
3. When comparing the mean of color differences of the normal tooth distribution to either the distribution of the typical discolored tooth or typical enamel opacity, the standard deviation made it possible to compare the distance between the 3 groups.
The results of this study suggest the possibility of screening in differentiating tooth color using this method.View full abstractDownload PDF (3095K) -
Koichi SHIONO, Tadashi OGURA, Tetsuya KAMEGAI, Naohiko INOUE1987 Volume 37 Issue 5 Pages 721-728
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSA school dental examination not only clarifies the dental health condition of an entire population in a school, but can provide a good opportunity to give dental health education to young children as well, if its results are fully used as health guidelines for individual children. In a conventional school dental examination, however only the existence and degree of dental caries are, determined, and the necessity of dental treatment children are automatically informed of the according to the results. It cannot be said under such circumstances that school dental examinations are effectively utilized to provide dental health education to children in their for mative years.
One reason for this is that early detection and early treatment of dental caries are so strongly emphasized that all dental caries are subjected to treatment, even through caries involvement is very slight. Another reason is that it is still unclear to what extent mild dental caries in young children progresses, or remains in the same state.
With this in mind, we determined changes in the state of slight caries in permanent teeth over one year through school dental examinations for the purpose of evaluating the criteria of instructions used for effective health guidelines and education. As a result, it was revealed that 53.6% of dental caries as mild as C1 were retained without progression for a year. This suggested that there is a possibility of risk of advising unnecessary treatment in many cases whenever all dental caries are automatically included in the cases requiring treatment.View full abstractDownload PDF (1245K)
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