Dental abnormalities and bone lesions of the maxilla and mandible are found in more than 70% of patients with familial adenomatous polyposis (FAP). Dental abnormalities include impacted teeth (other than third molars), supernumerary teeth, congenitally missing teeth, and fused roots of molars. Bone lesions consist of osteomas--isolated or in clusters--in the maxilla and mandible. In this study of 24 patients, 75% had demonstrable dental abnormalities, and 79% had osteomas of the maxilla and mandible. Because dental abnormalities and bone lesions are present early in life, these features may be helpful in diagnosing this syndrome.

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