Double teeth--fusion or gemination?

Double teeth or joined teeth have been described under several different terms and the terminology is often confusing. There are several ways in which union of teeth can occur and the terms that are commonly used to describe the condition are fusion and gemination. Although primary double teeth themselves may be regarded as harmless anomalies, its presence can cause some abnormalities to occur in the permanent dentition. Therefore, early diagnosis of the anomaly is of considerable importance.