Gemination in primary central incisor

Synodontism involving both primary and permanent teeth in a mixed dentition case

“…One such challenging case has been reported by Filho et al where fusion between normal and supernumerary tooth was treated with root canal treatment, apical endodontic surgery, extraction of supernumerary tooth, and bone graft. [2][3][4][5][6][7][8][9] Fusion is often confused with a similar developmental anomaly; gemination. Gemination is a result of an incomplete division of a single tooth bud.…”

“…[1] Neena et al quoted a classification of double teeth by Aguiló et al, wherein anomaly teeth are divided into 4 morphological types using clinical and radiographic appearance. [3] • Type I single bifid larger than normal crown with a notch on the incisal edge, bifid pulp chamber, and normal sized root and pulp canal with widening in the cervical portion. • Type II large crown and a large root: A larger than normal crown usually with a groove or notch, a single large pulp chamber.…”

“…• Type IV fused crowns, double roots, two (or more) clearly distinct but joined roots with two separate canals. [3,10]…”

“…Other etiological factors suggested are thalidomide embryopathy, hypervitaminosis, fetal alcohol exposure, and syndromes such as trisomy 21, orodigitofacial syndrome, and Pierre-Robin syndrome. [1][2][3] Canines and lateral incisors are the most frequently involved teeth in cases of fusion and are more common in deciduous than in the permanent dentition. [2,4] Fusion has a prevalence of 0.1-2.5% in primary dentition and 0.1-0.2% in permanent dentition and has an equal predilection for males and females and favors Japanese population compared to the Caucasian population.…”

Pulpectomy in a Primary Tooth with Gemination: A Case Report

“…The other names for gemination aredouble teeth, double formations, joined teeth, fused teeth or dental twinning [4]. Prevalence in the Indian population of gemination is reportedly 0.28% [5]. It is more prevalent in the primary dentition than in the permanent dentition.…”