Understanding the effects of primary double tooth (PDT) on permanent successors is important to ensure healthy
permanent occlusion and aesthetics. The aim of this study is to determine the prevalence and type of PDT, their effect on permanent
successors, and the accompanying dental anomalies/pathologies in a Turkish population.
The records of 63 PDTs in 54 healthy Caucasian children among 10,000 patients were investigated. PDTs were classified according to
The prevalence of PDT was 0.6. Of the 63 PDTs, 14.3 were type I, 11.1
were type II, 31.7 were type III, and 41.3 were type IV; one (1.6) was a triple tooth. Aplasia of the permanent
lateral incisor was observed most frequently in association with type I (56) PDT. All PDTs associated with a supernumerary
permanent tooth were type IV. Dental anomalies/pathologies such as odontoma, talon cusp were observed. Caries involvement was
observed most frequently in type IV (58.3) PDT. Statistics: The chi-squared test was used to determine whether successor
aplasia depended on PDT type, and contingency coefficients () were calculated to determine the degree of association between
aplasia and PDT type.
Clinicians should assess PDT clinically and radiographically to determine whether they are
associated with aplasia of permanent lateral incisors (type I) or supernumerary permanent teeth (type IV). Type IV of PDT should be
sealed with sealant or resin.
Vol.15 – n.3/2014
Harvard: A. Z. Zengin, P. Celenk, K. Gunduz, M. Canger (2014) "Primary double teeth and their effect on permanent successors", European Journal of Paediatric Dentistry, 15(3), pp309-312. doi:
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