Fusion, an uncommon anomaly of the hard dental tissues, is potentially the cause of clinical problems related to esthetics, tooth spacing, and other periodontal complications. This paper describes a multidisciplinary approach involving surgical, endodontic, restorative, and orthodontic attention for the successful, functional, and esthetic rehabilitation of a maxillary left lateral incisor fused with a supernumerary tooth in unilateral cleft lip adolescence in contralateral side. After clinical and radiographic examinations, a fusion between the left maxillary lateral incisor and a supernumerary tooth was diagnosed in the patient, and a small connection was detected between the pulp systems of the two root canals. The case reported in this paper presents the successful resolution of a fused maxillary lateral incisor with a supernumerary tooth, using endodontic, surgical, restorative, and orthodontic management. The decision made in extracting or retaining the fused tooth depends on the arch discrepancy and esthetic needs. Future studies, with long-term followup, will be helpful in evaluating the long-term efficacy of the different treatment options. 1. Introduction The excessive mesiodistal width of a clinical crown might indicate the presence of a double tooth. The term double tooth is often used to describe fusion or germination, both of which are primary developmental abnormalities of the teeth that may require treatment for esthetic, orthodontic, and functional reasons [1]. Fusion occurs due to the union of two or more, separately developing, tooth buds at dentinal level, presenting one single large tooth structure and an increase in tooth number of the affected dentition, especially when it takes place between normal and supernumerary teeth [2]. The etiology of fusion is uncertain, with trauma, diseases, or genetics having been suggested as possible causes [3]. Clinically, fused teeth appear as a broad crown with a vertical groove extending toward the gingival sulcus. The pulp chamber and the root canals can either be joined or separate [4]. Fusion is an uncommon anomaly of the hard dental tissues, potentially causing clinical problems related to esthetics, tooth spacing, and other periodontal difficulties. The incidence of fusion is approximately 0.1% in permanent dentition and 0.5% in primary dentition, for the Caucasian population [5]. This case report describes the successful, functional, and esthetic rehabilitation of a maxillary lateral incisor fused with a supernumerary tooth in unilateral cleft lip adolescence. The adopted multidisciplinary
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