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A survey was made of the dental conditions of eighty Mongoloid patients who are living in a hospital for mental defectives. Of the eighty, forty-nine were under the age of 15 years. The majority of the patients suffered from severe destructive periodontal disease which appears to commence at an early age, to attack the incisor regions, and to bear little relation to local etiological factors.
Calculus formation is not common, and there is no correlation between the state of oral cleanliness and the periodontal disease present.
About half the patients have a Class III occlusion (that is, the lower incisors are anterior to the upper incisors when the jaws are closed).
A high percentage of these patients have one or more congenitally missing teeth, and a surprising number show a complete absence of dental caries.
The findings of Nash, as reported by Benda,1 and of Dow2 are supported by this survey.
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© 1961 Published by Elsevier Inc.