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Environ Health Prev Med. 2018 Oct 31;23(1):55. doi: 10.1186/s12199-018-0748-6.

Prevalence of molar incisor hypomineralization and regional differences throughout Japan.

Author information

1
Division of Pediatric Dentistry, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Tobetsu, Ishikari, Hokkaido, 061-0293, Japan. msaitoh@hoku-iryo-u.ac.jp.
2
Committee of Clinical Research Promotion, Japanese Society of Pediatric Dentistry, Tokyo, 170-0003, Japan. msaitoh@hoku-iryo-u.ac.jp.
3
Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, 951-8514, Japan.
4
Committee of Clinical Research Promotion, Japanese Society of Pediatric Dentistry, Tokyo, 170-0003, Japan.
5
Division of Pediatric Dentistry, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Tobetsu, Ishikari, Hokkaido, 061-0293, Japan.
6
Division of Pediatric Dentistry, Department of Oral Health and Development Sciences, Tohoku University Graduate School of Dentistry, Sendai, 980-8575, Japan.
7
Department of Epidemiology and Health Policy, University of Toyama Graduate School of Medicine and Pharmaceutical Sciences, Toyama, 930-0194, Japan.
8
Department of Dentistry for Growth and Development of Oral Function Pediatric Dentistry, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, 238-8580, Japan.

Abstract

BACKGROUND:

Molar incisor hypomineralization (MIH) frequently occurs in children worldwide. However, MIH prevalence throughout Japan has not yet been investigated. The purpose of this study was to clarify MIH prevalence rates and to consider potential regional differences throughout Japan.

METHODS:

A total of 4496 children aged 7-9 years throughout Japan were evaluated in this study. MIH prevalence rates among children were evaluated in eight regions throughout Japan. A child's residence was defined as the mother's residence during pregnancy. The localization of demarcated opacities and enamel breakdown was recorded on a standard code form using a guided record chart. Logistic regression analysis was used to evaluate whether MIH prevalence rates differed among age groups, sex, and regions.

RESULTS:

The overall prevalence of MIH in Japan was 19.8%. The prevalence of MIH was 14.0% in the Hokkaido region, 11.7% in the Tohoku region, 18.5% in the Kanto Shin-Etsu region, 19.3% in the Tokai Hokuriku region, 22.3% in the Kinki region, 19.8% in the Chugoku region, 28.1% in the Shikoku region, and 25.3% in the Kyushu region. These regional differences were statistically significant. Moreover, MIH prevalence rates decreased with age. No significant sex differences in MIH prevalence rates were demonstrated.

CONCLUSIONS:

To our knowledge, this is the first MIH study carried out in several regions throughout Japan. Regional differences existed in MIH prevalence rates; particularly, MIH occurred more frequently in children residing in southwestern areas than those in northeastern areas of Japan.

KEYWORDS:

Molar incisor hypomineralization; Prevalence rates; Regional differences

PMID:
30382812
PMCID:
PMC6211451
DOI:
10.1186/s12199-018-0748-6
[Indexed for MEDLINE]
Free PMC Article

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