JOURNAL OF DENTAL HEALTH
Online ISSN : 2189-7379
Print ISSN : 0023-2831
ISSN-L : 0023-2831
Volume 40, Issue 1
Displaying 1-14 of 14 articles from this issue
  • Tomoji IGAWA
    1990 Volume 40 Issue 1 Pages 2-23
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    A 5-day fluoride (F) balance experiment in which an experimental diet was prepared from a combination of everyday food products was conducted in 11 adult females in order to investigate F metabolism in the body, mainly with respect to obtaining basic data related to the application of F to caries prevention. Fecal and urinary samples were collected in a metabolic laboratory facility from the first day of the experiment until day 5. Analytical assays of F, such as Ca, P, and trace elements (Zn, Cu, Se, and Fe) were carried out and the balances of the respective substances investigated. The following conclusions were obtained.
    1) The mean daily F intake value for the experimental diet was found to be 359μg, with the range being 304-439μg. F balance was investigated using fecal and urinary F excretions. It was found that approximately 87.8% of the F was absorbed by the body, of which about 50.2% was excreted via the urine, resulting in a retention rate of about 43.9%. Investigation of daily fluctuations in urinary F excretion revealed no significant differences in the mean values. A positive, significant correlation was found between F intake and F absorption, and a negative, significant correlation was observed between urinary F excretion and F retention.
    2) When the relationship between F and Ca was investigated, it was found that positive, significant correlations existed between F intake and Ca intake, F intake and urinary Ca excretion, fecal F excretion and urinary Ca excretion, and F absorption and Ca intake. A significant negative correlation was found between F absorption and urinary Ca excretion.
    When the relationship between F and P was examined, significant positive correlations were found between F intake and P intake, F intake and urinary P excretion, fecal F excretion and fecal P excretion, and F absorption and P intake. A significant negative correlation was found between fecal F excretion and P retention.
    3) Investigation of the relationships between F balance and the balances of Zn, Cu, Se and Fe revealed significant correlations for all 4 elements. This was judged to result from the correlation between F intake and absorption and the intakes of the 4 elements. Significant positive correlations were found between fecal F excretion and the fecal excretions of Cu, Se, and Fe.
    4) From the above, it was possible to obtain basic information related to the retention of F in foods when F is used for the prevention of caries. A strong relationship was found between F metabolism and the metabolism of Ca and P. The results of the study suggested a certain degree of relationship between F metabolism and Zn, Cu, Se, and Fe metabolism, so it is thought that further research is required in order to clarify these findings.
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  • Keiichi SAITO, Katsuhiko TAURA, Yoshihiro SHIMADA
    1990 Volume 40 Issue 1 Pages 24-36
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The aim of this study was to evaluate the progression rate of attrition in deciduous teeth by age. The attrition in each deciduous tooth was examined in 257 nursery school children aged 1 to 6 years in Sendai using criteria graded in 6 or 7 degrees for incisors, canines and molars.
    These subjects were divided into 11 age groups at six-month intervals, and the data of attrition were statistically analysed. The findings were as follows.
    1) There were no differences in the progression rate of attrition between right and left teeth or between boys and girls in almost all age groups, and the mean attrition score of each tooth type advanced with increasing age.
    2) When the attrition scores of lower and upper teeth in each tooth types were compared, lower central incisors, upper lateral incisors, upper canines and lower second molars showed a higher rate of attrition than teeth in the opposite jaw.
    3) A higher rate of attrition was detected in the central incisors and in the first molars than in the lateral incisors and the second molars.
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  • Hisanori FUKUSHIMA, Yukari TOYOSHIMA, Jun-ichi INOUE, Hidenori MOROI, ...
    1990 Volume 40 Issue 1 Pages 37-45
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    In vitrocariogenicity of transgalactosylated oligosaccharide (TOS) was examined using oral streptococci. The results were as follows:
    1. Purified TOS (TOS-P) was not utilized for growth and production of lactic acid by oral streptococci. The utilization value of TOS-P was lower than that of neosugar-P.
    2. Association of TOS-P and TOS-50 with adherence in oral streptococci was not recognized.
    3. Insoluble and soluble glucans from TOS-P and TOS-50 were not produced by GTase derived fromS. mutansATCC 25175 andS. sobrinusATCC 33478.
    These results indicate that TOS is useful as a non-cariogenic sugar.
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  • Yuuki OZAWA, Yoshihiro SHIMADA
    1990 Volume 40 Issue 1 Pages 46-52
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    This study was performed to find the relationship between pressure and adhesive force during probing in pits or fissures, clinical diagnosis, histopathological diagnosis, and tooth breakdown. The pits and fissures of 39 extracted premolar and molar teeth were probed with the pressure of about 800g and were clinically diagnosed. At the same time, the pressure of inserting the explorer into the pit or fissure and the adhesive force of pulling the explorer were measured by the previously reported system. Then a vertical ground section through the pit or fissure was prepared from each tooth. The section was observed by light and polarizing microscopy and by microradiography.
    The coincidence between the clinical and histopathological diagnoses was not good in initial caries but good in advanced caries. There was some tooth breakdown caused by the explorer in all the cases diagnosed as clinically carious and in more than one third of the cases diagnosed as clinically sound. There was histopathological caries in all the cases accompanied by tooth breakdown and in many cases not accompanied by this. The mean adhesive force at probing was greater with the advance of clinical caries and the adhesive force of 100g was between the mean adhesive forces of the groups of clinically sound teeth, and C1. There was histopathological caries in all of the 13 cases observed with an adhesive force of over 100g, and in the 8 cases in which the caries advanced into the dentin. There was tooth breakdown in all cases observed with an adhesive force over 100g.
    These results suggest that it is necessary to investigate the appropriate pressure for probing because the pressure of 800g during probing in this study may produce a traumatic tooth breakdown favoring lesion progression.
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  • Masaki IWAKURA, Yoshiro SHIBUYA, Yoko YASUNO, Yoshihiro SHIMADA
    1990 Volume 40 Issue 1 Pages 53-59
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    We made a preliminary prevalence study of characteristic gingival hyperplasia induced by nifedipine, a Ca2+ antagonist, which is used for hypertension or angina pectoris.
    93 subjects were out- or in- patients with hypertension or cardiopathy in one private hospital in Sendai city.
    Persons who received other gingival hyperplasia inducing drugs, or persons who had received nifedipine in the past and were not receiving it now were excluded. The 46 remaining persons were enrolled as the nifedipine therapy group, and 16 persons had no history of nifedipine therapy were enrolled as the control group.
    In the nifedipine therapy group, 5 persons (10.9%) were designated as characteristic gingival hyperplasia+, and 10 persons (21.7%) were designated as ±. In the control group, no one was designated as characteristic gingival hyperplasia + and one person (6.3%) was designated as ±. In statistical analysis, the nifedipine therapy group had more incidence of characteristic gingival hyperplasia than the control group (p=0.034) (Table 2). Comparing the characteristic gingival hyperplasia+group and the-group in the nifedipine therapy group, the mean PI value was higher in the + group (p<0.05). But in CI and DI, no statistical difference was found between the two groups (Table 4).
    The average medication period of the characteristic gingival hyperplasia + group was 11.8 months (range 4-29), but there was no difference when compared with the characteristic gingival hyperplasia -group. The accumulated dose in the gingival hyperplasia - group was higher than in the gingival hyperplasia + group (Table 5).
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  • Katsuhiko TAURA, Yoshihiro SHIMADA
    1990 Volume 40 Issue 1 Pages 60-65
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
  • Tsuyoshi YAKUSHIJI, Midori KATSUKI, Akari YOSHIMITSU-NARITA, Setsuko S ...
    1990 Volume 40 Issue 1 Pages 66-73
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
  • Masayuki UENO
    1990 Volume 40 Issue 1 Pages 74-88
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    This study was designed to examine the caries incidence of tetracycline administered rats.
    The experiment was divided into three series. In the first series, the rats were daily injected subcutaneously with tetracycline hydrochloride (50mg/kg body weight) from 10 days of age to weaning at 21 days of age. Rats injected with saline solution served as controls, and caries incidence was compared. In the second series, the caries inhibitory effects of fluorides (NaF in drinking water or topical application of APF) on tetracycline administered rats were assessed. In the third series, the acid resistance and the Vickers microhardness of enamel were measured in lower first molars.
    The results obtained were as follows:
    1) Compared with the control group, dental caries was significantly increased in tetracycline administered rats.
    2) Dental caries in tetracycline administered rats was drastically reduced when fluorides were applied.
    3) The acid resistance in tetracycline-affected enamel was decreased, but it was increased when fluorides were applied.
    Microhardness of tetracycline-affected enamel was decreased, but a rehardening was shown when APF was topically applied.
    On the basis of these results, I conclude that the caries resistance is decreased in tetracycline administered rats by reduction in acid resistance and hardness of tetracycline-induced hypoplastic enamel, but it is increased when fluorides are applied.
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  • Nobuhiro HANADA, Yoshihisa YAMASHITA, Yukie SHIBATA, Tadamichi TAKEHAR ...
    1990 Volume 40 Issue 1 Pages 89-93
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
  • Shiomi IZU
    1990 Volume 40 Issue 1 Pages 94-103
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The effect of the incremental line of human cementum on the distribution of fluoride was examined by abrasive micro-sampling (Weatherell et al., 1985) and the histological observation. The cementum materials used were removed from subjects aged 42 to 61 years old. Two mesiodistal sections about 300μm thick were cut parallel to the longitudinal axis of the mesio-buccal roots. A sliced section of the unexposed cementum near the apex was observed after staining with hematoxylin to provide a detailed histological picture. Phosphorus distributions were also determined by X-ray micro-analysis of one of the remaining portions of the root. Layers of cementum were removed from the other specimen by abrasive microsampling. Fluoride and phosphorus concentrations were determined with a fluoride electrode (Hallsworth et al., 1976) and the colourimetric procedure of Chen et al. (1956).
    The results were as follows;
    1) The incremental line of cementum was observed in every cementum examined. Phosphorus concentration was relatively high at the incremental line.
    2) The fluoride concentration did not coincide with the incremental line at the external layers of the tissue. However, it decreased markedly towards the interior of the tissue.
    3) Fluoride concentration tended to be high at the incremental line, as was the phosphorus concentration, but showed a greater variation than that of phosphorus.
    4) It was concluded that the fluoride concentration was high on the incremental line probably due to cementum growth and its relatively high mineral content.
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  • Koji KAWASAKI, Youichi IIJIMA, Okiuji TAKAGI
    1990 Volume 40 Issue 1 Pages 104-111
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The changes of mineral content in surface enamel and artificially formed enamel fissures were investigated by pH cycling. Lesions were produced on sound enamel with artificially formed fissures by a 12-hour immersion in 0.1 M lactic acid buffer containing 120 ppm Ca, 55.8 ppm P, 1% CMC, adjusted to pH 4.5 at 37°C. The samples were divided into three groups. The control group received no further treatment. The other two groups were subjected to two different pH cycling systems: (1) a 20-hour immersion in remineralizing solution containing 120 ppm Ca, 55.8 ppm P, 150 mM NaCl, adjusted to pH 7.0 at 37°C plus a 4-hour immersion in the same latic acid buffer used before [F (-) grop) ; and (2) the same alternating of de-and remineralization as (1), but the remineralizing solution contained 3 ppm F (F (+)-) group].
    The results showed little change of mineral content in the fissure enamel. However, large mineral loss in the surface enamel was found by quantitative microradiographic evaluation. Microradiographic pictures of the remineralized enamel surface in the F (+) group showed lamination structure. The degree of inhibition of mineral loss were much higher in the F (+) group of the remineralized enamel surface than in the F (-) group. Furthermore, an increase of mineral content was observedin the shallow part of the enamel surface in the F (+) group.
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  • Mizuo KANI, Tokuko KANI, Atsunori ISOZAKI, Tatsuhiro TOKUMOTO, Tamie O ...
    1990 Volume 40 Issue 1 Pages 112-127
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The purpose of this study was to clarify the cariostatic effect when mouth rinsing with dilute fluoride solution was introduced into school dental health programs.
    The subjects were 300 children (160 boys and 140 girls), who used a 100ppm fluoride mouth rinse with for 6 years. These subjects were analysed by cohort observation. As controls, 943 schoolchildren (479 boys and 464 girls) in 1986 and 1987 who had no fluoride mouth rinsing were analysed by longitudinal observation and were compared with the fluoride group. A precise oral examination was carried out once a year. An evaluation of cariostatic effect was performed by DMFT index, DMF rate for each tooth type, and comparison between fluoride groups of DMF rate of upper and lower first molar for each school grade at time of eruption.
    The increment of DMFT index in the fluoride group was less than in the control group. It showed a statistically significant cariostatic effect in the higher grades for both boys and girls. The DMF rate for each tooth type of 1, 2, 4, 5, 6, 7, 5 and 7 was reduced in the fluoride group and showed a statistically significant difference for both boys and girls. The DMF rate of upper first molar erupted during the first or second school grade showed no difference, but there was cariostatic effect when the molar erupted during the third grade.
    As a result, we recognized that a high cariostatic effect was obtained by introducing mouth rinsing with a solution of 100ppm fluoride into school dental health programs. Observation of DMF rate for each tooth type classified by school grade at time of eruption was a useful method for evaluating the cariostatic effect of fluoride mouth rinsing.
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  • Mutsumi SHIBUYA, Yoshinobu MAKI, Yoshinori TAKAESU
    1990 Volume 40 Issue 1 Pages 128-130
    Published: January 30, 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
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  • 1990 Volume 40 Issue 1 Pages 159
    Published: 1990
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
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