Faculty Profiles - YOSHIHARA Akihiro

Papers - YOSHIHARA Akihiro

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Caries Prevalence and Missing Teeth among the Workers at the Prefectural Office of Niigata

YOSHIHARA Akihiro, KOBAYASHI Seigo, TAKATOKU Yukio, KAZIYAMA Toru, ANDO Yuichi, HORII Kin-ichi

JOURNAL OF DENTAL HEALTH 45 ( 5 ) 826 - 828 1995

Treatment and Posttreatment Effects of Fluoride Mouthrinsing after 17 Years

Seigo Kobayashi, Hiroshi Kishi, Akihiro Yoshihara, Kin‐ichi Horii, Akihito Tsutsui, Tatsuo Himeno, Alice M. Horowitz

Journal of Public Health Dentistry 55 ( 4 ) 229 - 233 1995

Language：English Publishing type：Research paper (scientific journal)

Objectives: This study assessed the treatment and posttreatment effects of a school‐based, fluoride mouthrinse regimen. Methods: Children in a nonfluoridated community in Japan participated in a daily rinse program using a 0.05 percent NaF solution in nursery and primary schools, and a weekly rinse with 0.2 percent NaF in junior high school. Students were examined at least annually for dental caries and dental treatment was provided in a public dental clinic through the ninth grade. Incipient carious lesions with no cavitation were not restored. Results: The percent of children in grades one through nine (6–14 years of age) with caries‐free permanent teeth increased from 13.4 percent in 1974 to 73.0 percent in 1991, while the mean DMFT decreased by 86 percent during this period. For 12‐year‐olds, mean DMFT scores declined to about one tooth per child after 1982. For adults 20 years of age, there was a 64 percent difference in DMFS between the treatment group who started the rinse regimen at 4 years of age and continued for 11 years, and the controls who lived in different districts and did not participate in a fluoride rinse regimen. Conclusions: Children who began rinsing at 4 or 5 years of age benefited the most from the program. The program was inexpensive, simple to implement and well accepted by families and teachers. The conservative treatment policy in the public clinic likely contributed to the benefits derived by participants. Copyright © 1995, Wiley Blackwell. All rights reserved

DOI： 10.1111/j.1752-7325.1995.tb02374.x

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The Prevalence of Dental Fluorosis and Non-fluoride Enamel Mottling in the Natural Fluoride Areas, Japan.

TSUTSUI Akihito, TAKIGUCHI Toru, SAITO Shin-ichi, TAMURA Takuya, YAGI Minoru, ANDO Yuuichi, KISHI Hiroshi, KOBAYASHI Hideto, YANO Masatoshi, YOSHIHARA Akihiro, WATANABE Yuzo, KOBAYASHI Seigo, SAKUMA Shihoko, NOGAMI Shigeki, KOIZUMI Nobuo, NAKAMURA Munetou, WATANABE Takeshi, HORII Kin-ichi, SAKAI Osamu

JOURNAL OF DENTAL HEALTH 44 ( 3 ) 329 - 341 1994

Language：Japanese Publisher：Japanese Society for Oral Health

The optimal fluoride concentration has not been determined because there were few epidemiological studies about dental fluorosis in Japan. The purpose of this study was to investigate the relationship between the prevalence of enamel mottling and fluoride concentration in drinking water in Japan. We began to look for naturally fluoridated areas in central Japan in 1978. As a result, we found 7 communities in 5 prefectures. There were 26 water supply systems in their communities, and their fluoride concentrations ranged from 0 to 1.4ppm. Subjects for analysis were 1, 081 children aged 10-11 who had lived in the communities from birth. Dean's Index was used for the classification of dental fluorosis, and non-fluoride enamel mottling was classified in the same way as Dean's Index, too. A significant positive correlation (r=0.485, p<0.05) was found between the prevalence of dental fluorosis (very mild or mild types) and fluoride concentration and a negative correlation (r=-0.429, p<0.05) was found between the prevalence of non-fluoride enamel mottling and fluoride concentration. There was no relationship (r=-0.129, ns) between the prevalence of all enamel mottling and fluoride concentration. We could not find moderate or severe types of dental fluorosis in these investigations and CFI ranged from 0.04 to 0.30. We concluded that there was no problem concerning dental fluorosis from 0 to 1.4ppm fluoride concentration in the drinking water in these communities. We believe that these findings make up for the insufficiency of the epidemiological study of dental fluorosis in Japan.

DOI： 10.5834/jdh.44.329

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Other Link： http://search.jamas.or.jp/link/ui/1995065921

A Reasonable Sealant Program for First Molars of Schoolchildren in a FMR Program.

YOSHIHARA Akihiro, KOBAYASHI Seigo, SAKUMA Sihoko, ANDO Yuichi, MINETA Kazuhiko, HORII Kin-ichi, TAKIGUCHI Toru

JOURNAL OF DENTAL HEALTH 44 ( 3 ) 260 - 266 1994

Language：Japanese Publisher：Japanese Society for Oral Health

In order to establish a more efficient program combining pit and fissure sealant with school-based fluoride mouthrinsing, we designed a program based on a screening method in which pits and fissures with higher caries sensitivity were selected using 4 indices and sealed. These 4 indices were sticky fissures diagnosed as CO, occlusal index, occlusal plaque index (O.P.I), and school grade. The purposes of this study are the evaluation of the usefulness of the program. The subjects, 1st to 3rd graders, were 465 children in elementary school Y and 175 children in elementary school W. The children lived in two neighboring villages which are similar in socioeconomic environment. They had participated in a school-based fluoride mouthrinsing program (FMR) since nursery school. The FMR consisted of rinsing daily with 0.05% NaF from 4 years of age at in nursery school and rinsing weekly with 0.2% NaF after entrance to elementary school. The screening method consisted of two steps. In the first step, sticky fissures in the occlusal surfaces, buccal pits, and lingual grooves of all 4 first permanent molars were diagnosed as CO. In the second step, the CO surfaces were evaluated based on occlusal index, O.P.I., and school grade. The surfaces evaluated as being in poor condition by these indices were distinguished as high risk CO (H-CO) from the other CO surfaces estimated as low risk CO (L-CO). In school Y light-polymerized opaque sealants were applied to H-CO surfaces and L-CO surfaces were left without any application until the next examination 6 months later. In school W both H-CO and L-CO surfaces were left without any application. The progression of caries from the previous level, i.e., sound, sealant applied, H-CO, or L-CO, was compared every 6 months. In school Y the percentage of surfaces progressing to above C1 after 6 months was 0.3% in sound, 12.5% in L-CO, and 0% in sealant-applied surfaces. The percentage of complete retention of sealant was 93.1%. The ratio of relative risk estimated was 50.0 in L-CO surfaces against sound surfaces. In school W the percentages of progressing surfaces were 1.6% in sound, 32.9% in H-CO, 17.6% in L-CO, and 30.1% in the total CO surfaces. The ratio of relative risk estimated was 18.8 in the total CO surfaces against sound surfaces and 1.9 in H-CO against L-CO. It was confirmed that CO surfaces, especialy H-CO surfaces selected by this screening method had more risk of dental caries. The relative risk of sound surfaces in progressing to dental caries was very low. Accordingly it was reasonable that the sealings were applied only to occlusal surfaces selected by the screening method without sealing all the occlusal surfaces. It was concluded that this program of selecting CO surfaces and applying sealant particularly to H-CO surfaces was appropriate for decreasing the cost of sealant application.

DOI： 10.5834/jdh.44.260

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Other Link： http://search.jamas.or.jp/link/ui/1995065937

An Epidemiological Study of Caries Prevalence, Daily Habits and Environment of Kindergarteners and Schoolchildren in Taiwan R.O.C.

WU Chicheng, TSUTSUI Akihito, WATANABE Takeshi, GUNJISHIMA Yuka, SOEJIMA Takashi, YAMASAKI Akihiro, FUJII Tojiro, TANAHARA Hidehito, MATSUNAGA Shouzo, TING Shengtsung, YEN Tungchieh, SAKAI Osamu, KOBAYASHI Seigo, SAKUMA Shihoko, ANDO Yuuichi, YOSHIHARA Akihiro, HORII Kin-ichi

JOURNAL OF DENTAL HEALTH 42 ( 3 ) 264 - 276 1992

Language：Japanese Publisher：Japanese Society for Oral Health

An epidemiological study of 2, 012 children by oral examination and questionnaire was undertaken to study the dental caries prevalence in one kindergarten and two elementary schools in an urban area and in one kindergarten and two elementary schools in a country area in 1989. The data showed that the dental health status was poor and that living habits and public medical service were unsatisfactory when compared with the results of other dental surveys in Taiwan R.O.C.. In the urban area caries prevalence in deciduous teeth in the kindergarten was 74.2%, and in permanent teeth in the two elementary schools it was 56.3% and 57.1%. In the country area caries prevalence in deciduous teeth in the kindergarten was 95.0% and in permanent teeth in the two elementary schools it was 68.0% and 56.4%, respectively. The dft index was 6.30 in the urban area and 9.00 in the country area, and the DMFT index was 1.87 and 1.58 in the urban area, and 2.02, 1.52 in the country area. The FT rate showed a low restorative treatment rate in both deciduous and permanent teeth. The ft rate was from 1.4% to 6.3% in kindergarteners and FT rate in elementary school children was from 10.5% to 35.6%. The results of the questionnaire regarding living habits, living environment and medical service were as follows: 1. Subjects who received topicl fluoride application or regular dental examination were few and there was a high percentage of experience of toothache and dental treatment. But because of the deficient public health system, the treatment of dental caries was mostly temporary treatment only, and therefore experience of both toothache and dental treatment were frequent. 2. The answers to the questionnaire showed that the parents know and acknowledge the use of fluoride. Our dental survey showed that dental caries is increasing in Taiwan and is near the level of Japan. There is no obvious difference in the public dental health situation or the living environment between the regions surveyed, and no definite direction could be observed between caries prevalence and living habits or living environment. The knowledge and acknowledgement of parents concerning fluoride will help to establish a community dental policy and contribute to the developement of school dental health.

DOI： 10.5834/jdh.42.264

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