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Resumo

An epidemiologic survey on the occurence of hypo‐ and hyperdontia was carried out among the 28,000 grade school children of Jerusalem. While the first condition was more prevalent among girls, boys had more supernumery teeth. The rate of both anomalities was higher in children belonging to Oriental ethnic groups than in children of European origin, and in Israelis of second generation. The maxilla was more often involved than the mandible, and the tooth most often lacking was the maxillary lateral incisor. Most supernumerary teeth were of the type of the 'mesiodens'.

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