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a: Distribution of unilateral and bilateral agenesis in the maxilla. Black: bilateral agenesis, white: unilateral agenesis. Elements 12 and 22 are the most affected. b: Distribution of unilateral and bilateral agenesis in the mandible. Black: bilateral agenesis, white: unilateral agenesis. Elements 35 and 45 are the most affected. The number on the bars refers to the number of patients showing either bilateral or unilateral agenesis.
