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Serial and cross-sectional cephalograms were read and the treatment files reviewed, for 521 children of a representative sample, the Burlington Growth Centre sample, to determine the frequency of congenitally missing third molars. All the children had at least two cephalograms taken between the ages of 3 and 21 years, and one of these was taken around 16 years. Of the 521 children studied, 22.3 % had congenitally missing third molars. There was no sex-specificity with respect to congenitally missing third molars or to the number of missing third molars in the maxilla and the mandible. Generally, more teeth were absent when third molars were congenitally missing. A relationship was found to exist between congenitally missing teeth and congenitally missing third molars in females. Thus, when third molars were absent, there was a sex-specificity for other congenitally missing teeth. The probability of specific teeth being missing was higher for those individuals with missing third molars than in the 1,191 10- to 12-year-old children of the overall Burlington Growth Centre sample. [ABSTRACT FROM AUTHOR]

The article previews the Council for Exceptional Children's 49th Annual Convention in Miami Beach, Florida on April 18-24, 1971. It includes information on the highly professional series of section meetings during the convention, participants of the affair who come from the U.S., Canada and other countries.

The article talks about the television program of creative art activities for children, which is sponsored by the Buffalo Evening News station WBEN-TV. The series of children's programs are broadcasted every Wednesdays at 5:00 P.M. Through the television, children throughout western New York, northeastern Pennsylvania, and southern Ontario, Canada, are invited to participate with the moderator of the "Fun to Learn About Art" program. Four children are designated as studio participants. A college professor who specializes in art teacher education serves as the program moderator.

The article focuses on the formation of the Council for Exceptional Children (CEC) Committee on Canadian Affairs, with the resultant increase in communication between provinces, a greater feeling of unity has been fostered among the CEC chapters in Canada. The committee has been actively involved in the preliminary planning for the Regional Conference. The main current expenditure of the Committee on Canadian Affairs is the supplying of Special Education to each Canadian member.

The article previews the 51st Annual International Convention of the Council for Exceptional Children that will be held on April 22-27, 1973 in Dallas, Texas. It includes information on registration processes for the attendees, special meetings to be conducted throughout the convention week, and the participants of the convention coming from different countries such the U.S. and Canada.

The article reports developments on the membership of the Council for Exceptional Children (CEC). At the end of April 1959, the Council is gaining additional 1,300 members over the same period in 1958. CEC has now a total of 12,874 members. The increase in the membership of the CEC is due to the new chapters of the Council throughout the U.S. and Canada.