Published online August 1, 2005
PEDIATRICS Vol. 116 No. 2 August 2005, pp. e186-e190 (doi:10.1542/peds.2004-2628)
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ELECTRONIC ARTICLE

Association of Melanin Pigmentation in the Gingiva of Children With Parents Who Smoke

Takashi Hanioka, DDS, PhD*, Keiko Tanaka, DDS, PhD{ddagger}, Miki Ojima, DDS, PhD§ and Kazuo Yuuki, DDS||

* Department of Preventive and Public Health Dentistry, Fukuoka Dental College, Fukuoka, Japan
{ddagger} Department of Public Health, Fukuoka University School of Medicine, Fukuoka, Japan
§ Department of Preventive Dentistry, Graduate School of Dentistry, Osaka University, Osaka, Japan
|| Yuuki Dental Clinic (private practice), Yamagata, Japan

Objective. The association between gingival pigmentation and active smoking has been established. This investigation is the first to address the relationship between gingival pigmentation in children and passive smoking.

Methods. A case-control study was performed involving 59 nonsmoking children who were selected from patient records of a dental clinic in a rural town in Japan. The number of subjects was based on a power calculation. Two calibrated examiners independently observed labial gingiva via oral photographs.

Results. An interview determined that 61% of children had at least 1 smoking parent. Gingival pigmentation was observed in 71% to 78% of children. Interexaminer agreement was satisfactory ({kappa} = 0.73). Percentage of smoking parents was higher in children with gingival pigmentation (70–71%) than in those who lacked pigmentation (35%). Odds ratios of parental smoking adjusted by age and gender were 5.6 (95% confidence interval: 1.5–20.0) and 5.4 (1.4–21.2) for the 2 examiners.

Conclusion. These findings suggest that excessive pigmentation in the gingiva of children is associated with passive smoking. The visible pigmentation effect in gingiva of children could be useful in terms of parental education.

Key Words: parental smoking • melanin pigmentation • gingiva • child

Abbreviations: ETS, environmental tobacco smoke • OR, odds ratio • CI, confidence interval

Accepted Feb 10, 2005.




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