Biomaterial Database

Prevalence of congenital dental anomalies of the deciduous dentition in Japanese children. 1997

T Yonezu, and Y Hayashi, and J Sasaki, and Y Machida

Department of Pediatric Dentistry, Tokyo Dental College, Chiba, Japan.

We examined the prevalence of anomalies in deciduous dentition in 2,733 Japanese three-year-old children. The results showed that fused teeth occurs in 4.10%, congenital missing teeth in 2.38%, enamel hypoplasia in 1.50%, peg-shaped teeth in 0.55%, palatal cusps in upper deciduous incisors in 0.37%, supernumerary teeth in 0.07%, and color anomalies in 0.07%. Sixty-nine boys and 43 girls had fused teeth, percentages of 4.88 and 3.26, respectively. This difference was significant. All the fused teeth were located in the anterior region and were more frequent in the mandibular than in the maxillary arch. In the mandibular arch, 50 cases involved the lateral incisor and canine; the central incisor and lateral incisor were fused in 48 instances. There were 30 boys (2.12%) and 35 girls (2.65%) with congenitally missing deciduous teeth. This difference was not significant. Unilateral missing teeth were more frequently observed than bilateral missing ones. The lower lateral deciduous incisor was the most frequently missing tooth. The prevalences of fused teeth and congenital missing teeth were significantly higher in this study than in studies of American and Scandinavian children. These two anomalies are tending to increase in frequency in Japan.

UI	MeSH Term	Description	Entries
D007223	Infant	A child between 1 and 23 months of age.	Infants
D007564	Japan	A country in eastern Asia, island chain between the North Pacific Ocean and the Sea of Japan, east of the Korean Peninsula. The capital is Tokyo.	Bonin Islands
D008297	Male		Males
D002675	Child, Preschool	A child between the ages of 2 and 5.	Children, Preschool,Preschool Child,Preschool Children
D005260	Female		Females
D005671	Fused Teeth	Two teeth united during development by the union of their tooth germs; the teeth may be joined by the enamel of their crowns, by their root dentin, or by both.	Double Tooth,Fused Mandibular Incisors,Incisors, Fused Mandibular,Teeth, Fused,Fused Mandibular Incisor,Incisor, Fused Mandibular,Mandibular Incisor, Fused,Mandibular Incisors, Fused,Tooth, Double
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000848	Anodontia	Congenital absence of the teeth. It may involve all (total anodontia) or only some of the teeth (partial anodontia, hypodontia), or six or more of the teeth (oligodontia) and both the deciduous and the permanent dentition, or only teeth of the permanent dentition.	Dental Agenesis, Familial,Familial Dental Agenesis,Familial Tooth Agenesis,Hypodontia,Oligodontia,Partial Anodontia,Total Anodontia,Hypodontia Oligodontia 1,Tooth Agenesis, Familial,Tooth Agenesis, Selective, 1,Agenesis, Familial Dental,Agenesis, Familial Tooth,Anodontia, Partial,Anodontia, Total,Familial Dental Ageneses,Familial Tooth Ageneses,Oligodontia 1, Hypodontia,Oligodontias,Partial Anodontias,Total Anodontias
D014071	Tooth Abnormalities	Congenital absence of or defects in structures of the teeth.	Odontome,Abnormalities, Teeth,Abnormalities, Tooth,Teeth Abnormalities,Abnormality, Teeth,Abnormality, Tooth,Odontomes,Teeth Abnormality,Tooth Abnormality
D014075	Tooth Discoloration	Any change in the hue, color, or translucency of a tooth due to any cause. Restorative filling materials, drugs (both topical and systemic), pulpal necrosis, or hemorrhage may be responsible. (Jablonski, Dictionary of Dentistry, 1992, p253)	Discoloration, Tooth,Discolorations, Tooth,Tooth Discolorations