Fusion of Primary Mandibular Anterior Teeth Associated with Partial Anodontia of Primary and Permanent Dentition: A Case Report

Fusion represents the union of two normally separated tooth germs [1]. It is a dental twinning anomaly and also known as double teeth, conjoined teeth or twinned teeth. Clinically, the appearance of the involved teeth may be normal sized or large, depending upon the stage at which embryological union occurs during development. It is commonly confused with gemination, particularly if it involves a supernumerary tooth [2]. Fused teeth are more common in primary dentition as compared to permanent dentition [3]. The prevalence of fusion in the primary dentition for unilateral presentation is 0.1% to 1.5% [2]. However for Indian population it is 0.14%, as confirmed by Reddy and Munshi [4]. Males and females are equally affected. According to Hagman, genetics plays an important role when there is an increased incidence [5]. The presence of fused teeth can cause clinical problems related to appearance, spacing and periodontal conditions [6]. Fused primary teeth are correlated with the agenesis of permanent teeth, and the prevalence depends on the combination of fused primary teeth as reported by Tsujino et al [7].