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Volume 30 (1980 - 198･･･
- Issue 5 Pages 406-
- Issue 4 Pages 312-
- Issue 2 Pages 72-
- Issue 1 Pages 2-
Volume 30, Issue 5
Displaying 1-4 of 4 articles from this issue
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Shigeru YAMADA, Yoshiaki GO, Hitoshi TAJIMA, Kazuo HORIUCHI, Sayoko MA ...1981 Volume 30 Issue 5 Pages 406-414
Published: 1981
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSIn the present study, an erythrosine-containing plaque coloration agent manufactured by company X was applied to a total of 40 3rd grade elementary school pupils and the detection of their plaque was attempted by 4 different methods.
In the two methods in which effect of erythrosine was maintained for one minute, the amount of residual erythrosine in the oral cavity was about 40%, whereas in the cases in which its effect was maintained for 20 seconds the residual amount was found to be anywhere from 34 to 37%.
Of the four different methods used, the 4th method in which subjects were instructed to chew the coloration agent 3 times for the purpose of diffusion in the mouth and ejected it after 20 seconds gave a statistically smaller value than the other three methods.
Although the method of 20 seconds was in some cases found to be inferior to that of one minute with respect to the degree of coloration, it was of sufficient value to evaluate the manner of plaque attachment in the elementary school children.
When the time of use of erythrosine was under 20 seconds, the state of plaque coloration was inadequate of the purpose of evaluation and, therefore, it was concluded that the 4th method was the most satisfactory one for the purpose.
The majority of methods to determine the plaque deposition by erythrosine or other agents are thought to have a sufficient degree of safety, but it is necessary that proper attention should be paid to their application, so that the residual amount of chemicals in the oral cavity is reduced to a minimum.View full abstractDownload PDF (4306K) -
Yoichi MIYAKE, Akira KOBAYASHI, Hiroshi YAMADA, Hideki FUKADA1981 Volume 30 Issue 5 Pages 415-422
Published: 1981
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThis paper describes a fundamental method for measuring the color of the gingiva with a multilayer color film. The Color Discrimination Index (CDI) which is defined from the photometric results using color film is introduced to express the color of the gingiva.
The CDI is independently determined from the color temperature of light sources or the variations, shown both theoretically and experimentally, of exposure value for photographs.
It is also shown that the CDI can be successfully applied to analyzing the gingival color with a digital image processing technique.View full abstractDownload PDF (3220K) -
Seiji NAGASAWA, Etsuo KISHIMOTO, Yoshio NARA, Narumi HATADA, Emiko MOR ...1981 Volume 30 Issue 5 Pages 423-431
Published: 1981
Released on J-STAGE: March 02, 2010
JOURNAL FREE ACCESSThirteen hundred and nineteen children aged 3 years living in Higashi-ku of Fukuoka City were examined for dental caries. To their mothers were given questionnaires concerning feeding methods, between-meal eating habits, using period of feeding bottles, use of feeding bottles at bedtime, kinds of between-meal snacks, drinking of acidophilus beverages, and so on. The percentage of the children with carious teeth was 75.5 and the mean deft was 4.5, and these were both samaller than the percentage of children with caious teeth and the mean deft of the whole nation, respectively. The percent of children with carious teeth was significantly larger in the following groups: breast-fed children, children using feeding bottles for more than 24 months, children using feeding bottles often at bedtime, children eating between meals irregularly, and children drinking acidophilus beverages every day or 2-3 times per week. The groups that took between-meal snacks irregularly had the largest percentage of children with carious teeth (83.5%) and the largest mean deft (5.5) throughout this study. Regarding the use of feeding bottles at bedtime, and between-meal eating habits including drinking of acidophilus beverages, breast-fed children did not have so strong a tendency toward dental caries as mixedand bottle-fed children. This study indicated that some circumstances such as breast feeding, long-term use of feeding bottles, frequent use of feeding bottles at bedtime, and irregular eating between-meal snacks might be harmful to the dental health of 3-year-old children.View full abstractDownload PDF (1848K) -
Akinori TAKAHASHI, Hirohisa ARAKAWA, Yasutoshi ASAI, Yoshikazu IIZUKA1981 Volume 30 Issue 5 Pages 432-442
Published: 1981
Released on J-STAGE: July 27, 2010
JOURNAL FREE ACCESSThe purpose of this study was to determine the level of fluoride uptake by the enamel from conventional MFP dentifrice and to make a survey on some compatible polishing agents with MFP.
Fluoride uptake by enamel from the MFP dentifrice “®Kodomo” was studied using bovine mandibular anterior teeth.
Forty grams of MFP dentifrice was suspended in the same weight of water, then a total of ten bovine teeth were immersed in it for two hours at 37°C. After the treatment, the suspension of dentifrice was removed and briefly washed away with water.
The surface of each treated tooth was etched with acid contained in non-woven paper (8mm in diameter) for the determination of fluoride acquired in each surface layer.
The results showed that fluoride was acquired from the MFP dentifrice to the depth of 6 microns in the bovine enamel surfaces.
The amount of fluoride at each depth-2, 3, 4, 5, and 6 microns was 1, 200, 900, 600, 500, and 300 parts per million, respectively.
The effect of polishing agents on the fluoride in bovine enamels from MFP solution was investigated using same procedure as above. Non-calcium polishing agents such as IMP (Insoluble Metaphosphate) and silica did not prevent the aquisition of fluoride from MFP solution. However, significantly less fluoride was aquired by bovine enamels from the solution contained MFP and calcium carbonte or DCP-D (Dicalcium phosphate dihydrate) than those treated with MFP solution.
The results suggest that MFP is very compatible with non-calcium polishing agents such as IMP and silica.View full abstractDownload PDF (1685K)
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