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Volume 41 (1991)
- Issue 5 Pages 596-
- Issue 3 Pages 242-
- Issue 2 Pages 152-
- Issue 1 Pages 2-
Volume 41, Issue 2
Displaying 1-10 of 10 articles from this issue
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Morphologic Measurement Using Two-Dimensional AnalysisHiroshi SEGAWA, Masaki KIKUCHI, Chyuzo MIYAZAWA, Tokio SHIMIZU1991 Volume 41 Issue 2 Pages 152-157
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESS -
Hiromu KUNISAKI1991 Volume 41 Issue 2 Pages 158-174
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this study was to assess the determinants of the image of dental treatments for people. Subjects were 344 persons with or without experience of dental treatment, including 174 males and 170 females. They were administered Cornell Medical Index (CMI) and a questionnaire which had 31 semantic differential scales of the image of dental treatment, and a few items asking the degree of fear of dental treatment and the like. To extract basic dimension of the image of dental treatment, factor analysis of the 31 scales on the image of dental treatment was performed. Varimax rotation of the original principal factor solution indicated that the image is composed of the following three factors: an emotion factor, a dentistry evaluation factor, and a potency factor. A kind of multiple regression analysis called Hayashi's quantification type 1 was applied to the following variables:
(1) each of the scores of the extracted factors as predictor variable, and
(2) 18 scales of CMI and a few items of the questionnaire such as school, career, gender, and others. The major results of the regression analysis were as follows:
(1) the determinants of the variation in the first factor are fear of dental treatment, occupation, and school career,
(2) those of the second factor are occupation and school career,
(3) those of the third factor are age and graduation, and
(4) neither the types of CMI nor the extracted factors of CMI are related to the image of dental treatment.View full abstractDownload PDF (1982K) -
I. Dental Health Activity Survey Using Salivary Blood Tests and CPITNToru ICHIHASHI, Noriko KUMAGAI, Masaki KOSHIMIZU, Teruo MATSUMURA, Aki ...1991 Volume 41 Issue 2 Pages 175-183
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this study was to clarify the effectiveness of dental health activities in the workplace and of a screening method employing salivary blood tests and the CPITN as indexes in relation to periodontal disease.
At the initial diagnosis in a certain workplace, when salivary blood tests and CPITN were used as indexes, 83 subjects were divided into 2 groups: individuals requiring attention (high-risk group) and individuals requiring no attention (low-risk group). Changes occurring in these individuals for the next 12months were observed. Of the total, it was possible to perform intermittent examinations on 40 individuals for the full 12 months. The results were as follows.
1) Salivary blood tests and average CPITN values proved reliable criteria in measuring the effectiveness of dental health activities.
2) In screening, individuals whose salivary blood tests showed hemoglobin volumes of more than 1mg/100ml (saliva) and average CPITN values of more than 2 were classified as high-risk. Concentrated guidance produced improvements in both salivary blood content and average CPITN values in these instances.
3) Dental hygienic practices reduced the volume of salivary blood, suggesting the possibility of keeping hemoglobin volumes below the level of 1mg/100ml (saliva) after a period of 12 months.
4) Relations between salivary blood volumes and CPITN scores were observed to change regularly according to conditions in the oral environment.
5) It was found that relations between salivary blood volumes and CPITN scores can be applied in judging group periodontal disease conditions.View full abstractDownload PDF (1340K) -
II. Relationship between Dental Health and Dental Behavioral AttitudeToru ICHIHASHI, Noriko KUMAGAI, Masaki KOSHIMIZU, Teruo MATSUMURA, Aki ...1991 Volume 41 Issue 2 Pages 184-191
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this study was to clarify the salutary effects of a dental health activity in the workplace on periodontal disease. To achieve this end, comparisons were made between conditions in subjects during a continuous one-year dental health activity and then during a period when no specific activity was being conducted.
After initial diagnosis of 83 subjects in a certain workplace, appeals in connection with dental hygiene were frequently made over a period of 12 months. Thereafter, no special appeals were made for another 12 months. It proved possible to conduct intermittent investigations of 40 of the subjects for 12months and of 24 subjects for 24 months.
During these 2 periods, items apparently contributing to improvements in periodontal disease were selected from among the following: oral environment, dental health behavior, and dental hygiene guidance. These items were submitted to analysis according to Hayashi's multidimensional quantification methods. The results were as follows.
1) Improvements in salivary blood and average CPITN values were observed in both the young and old age groups. Improvement was especially great during the period of frequent hygienic appeals.
2) With the young group, during the period of frequent dental hygiene appeals, improvements in average CPITN values were closely related to intensive guidance provided to individuals in the highrisk group, numbers of brushing sessions per day, and receipt of dental treatment. During the period in which no special dental hygiene appeals were made, improvement in average CPITN values depended largely on keeping the oral environment in good condition.
3) With the older group, during the period of frequent dental hygiene appeals, improvements in average CPITN values were closely related to receipt of dental treatment. Reasons for improvement in average CPITN values during the period in which no special dental hygiene appeals were made remained uncertain. Without supervision, conditions deteriorated even in individuals in which improvement had been made.View full abstractDownload PDF (1182K) -
Setsuko KUBOTA, Koji KAWASAKI, Youichi IIJIMA, Okiuji TAKAGI1991 Volume 41 Issue 2 Pages 192-205
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this survey was to analyze the factors affecting dental caries prevalence in 1.5-year-old children. The subjects were 1625 children who received a 1.5-year-old dental examination at the North Public Health Center in Nagasaki City from June 1988 to February 1989. Correlation between dental caries prevalence and items related to nursing, feeding, eating between meals, tooth brushing and others were analyzed. The results were as follows.
Caries susceptibility was higher in the first than in the second of the following groups.
1) The group still breast feeding vs. the group not breast feeding.
2) The group nursing in bed vs. the group not nursing in bed.
3) The group eating snacks three times or more per day vs. the group eating snacks twice or lessper day.
4) The group frequently eating sweets vs. the group seldom eating them.
5) The group frequently drinking a sportsdrink vs. the group seldom drinking juices.
6) The group somtimes eating sweets before dinner vs. the group seldom eating them before dinner.
Four factors ((1) Presently nursing, (2) Feeding in bed, (3) Eating snacks three times or more per day, (4) Drinking a sportsdrink frequently) were highly associated with dental caries prevalence. A combination of factor (3) and another was especially associated with dental caries prevalence.View full abstractDownload PDF (1902K) -
II 90Sr Level in a Sample Group of 10 Third MolarsMoriyo HINOIDE, Kazuhiko INOUE, Susumu IMAI, Makoto YAMAMOTO1991 Volume 41 Issue 2 Pages 206-213
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESS1. Japanese third molars were divided into sample groups based on the donor's year of birth, and 90Sr level in each sample group of 10 teeth was determined to compare it with the previously reported data obtained from sample groups of 28 teeth.
2. Trace and detection-limit amounts of 90Sr were detected in the teeth from donors born in 1929-1931. The 90Sr level increased in the teeth from donors born in 1935, and reached a peak value of 66.9-72.8mBq/g Ca in the teeth from donors born in 1953. It decreased afer 1954 and reached 25.5mBq/g Ca in the teeth from donors born in 1970.
3. Compared with previous data using 28 teeth as a sample group, good accordance was observed in period showing detection-limit level of 90Sr, tendency of increase thereafter, peak period, radioactivity at peak period, tendency of decrease after 1953 and radioactivity after peak period.
4. These results clearly indicate that a small sample, that is, 10 teeth, is sufficient for the examination of annual change in the 90Sr level.View full abstractDownload PDF (955K) -
Tamie OHASHI, Tokuko KANI, Atsunori ISOZAKI, Akiko NISHIDA, Hirohisa S ...1991 Volume 41 Issue 2 Pages 214-223
Published: April 30, 1991
Released on J-STAGE: November 26, 2010
JOURNAL FREE ACCESSThe purpose of this study was to examine the effect of apatite for dentifrice use on remineralization of initial caries lesion. Artificial caries lesions were formed on specimens of intact human enamel with demineralizing solution (50% synthetic hydroxyapatite saturated lactate buffer, pH 4.5 according to Moreno et al (1974) ). A simply demineralized group was used as control. Enamel blocks were immersed and stirred in a water solution of sludgy apatite at 37°C for 55hrs., followed by 24hrs. washing with synthetic saliva prepared according to Brikeland (1973) (HA group), and another group was washed only with synthetic saliva (Saliva group). SEM observation, polarized light microscopy (PLM), contact micro-radiography (CMR), microbeam X-ray diffractometry and analytical electron microscopy (AEM) were performed.
SEM images of artificial caries lesion surfaces showed a large quantity of minute deposits on enamel surface of artificial caries lesions in the HA group. The surface was smooth as compared with the control group. This indicated clear remineralization of lesions rather than the deposit of apatite.
CMR showed a thin radiopaque surface layer and radiolucent body of the lesion in the control group. In the HA group, the surface radiopaque layer was thick and the radiolucent body was unclear. PLM showed that the mineralized layer occupied a major portion of the surface and a thinner decalcified layer was found in HA group.
Microbeam X-ray diffraction pattern revealed hydroxyapatite.
In the HA group, crystallinity of the lesion body was high as compared with the control group and the saliva group by microbeam X-ray diffractometry. It was also higher than sound enamel.
SEM images of cross section showed notable remineralization in the HA group. Ca/P mole ratio of lesions determined by AEM was as high as that of sound enamel in the HA group, but was low in the saliva group.
Artificial caries lesions were remineralized slightly by immersion in artificial saliva solution. But in the HA group, significant acceleration of remineralization was observed.
We confirmed that remineralization of surface remineralized layer and demineralized lesion body of artificial caries lesions was advanced by exposure to a water solution of sludgy apatite for dentifrice use.
These findings suggested that the initial artificial caries lesion could be remineralized by exposure to a water solution of sludgy apatite for dentifrice use.View full abstractDownload PDF (9343K) -
5. Relations between Community Characteristics and Dental Health in Iwate PrefectureFumie TAKAHASHI, Tsuyoshi KATAYAMA, Kohko OSADA, Nobuhiro HANADA, Yosh ...1991 Volume 41 Issue 2 Pages 224-230
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe geographic distribution of caries prevalence rate among 3-year-old children in Iwate prefecture was determined according to political divisions in computing the annual statistical data for 1987. High caries prevalent areas were concentrated in the mountainous regions or the northern part of Iwate prefecture. The relations between these geographic differences in caries prevalence and community characteristics were studied by factor analysis. Three common factors (Factors I, II and III) were selected from a total of 20 community, socio-economical, cultural, and health indices of 62 municipal areas and these were characterized as “industry”, “population” and “medical service, ” respectively. The structural analysis of each municipal community using factor scores corresponding to Factor I or II revealed that the 62 municipal areas in Iwate prefecture could be classified into “urban” and “rural” areas, and the low caries prevalence rate among 3-year-olds was a dominant characteristic of the urban communities. In contrast, rural communities had high caries prevalence, but the low caries prevalent areas were not always coincident with the urban areas.View full abstractDownload PDF (1066K) -
A Comparative Study of Caries Experience among Scottish, Nigerian and Japanese Children Aged 5 YearsMasami YONEMITSU1991 Volume 41 Issue 2 Pages 231-233
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (351K) -
Takahide UCHIYAMA, Yoshino HASHIMOTO, Fumie TAKAHASHI, Izuru OGATA, Yu ...1991 Volume 41 Issue 2 Pages 234-236
Published: April 30, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (464K)
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