PMID: 6963769Jan 1, 1982Paper

Hypodontia in twins

Swedish Dental Journal. Supplement
M Markovic

Abstract

Plaster study models and intraoral and extraoral radiographs of 165 twin pairs (99 mono and 66 dizygotic) were used to investigate: 1. the frequency of hypodontia of permanent teeth in twins, 2. the concordance-discordance rate of hypodontia in monozygotic and dizygotic twins, 3. the empirical risk of hypodontia occurring in twins. Out of 165 sets of twins, 14 (9 mono and 5 dizygotic) or 8.5% (5.5% monozygotic and 3.0% dizygotic) had hypodontia. This was within the frequency range of the general population (from 2.3% to 9.6%). Second maxillary incisors were the teeth most frequently absent or hypoplastic (peg-shaped). This was found in 5 monozygotic and 3 dizygotic sets of twins. It was followed by agenesis of the lower second premolars (in 5 pairs). Hypodontia of the remaining teeth was a rare finding. One member of a monozygotic pair showed agenesis of the left maxillary canine and the other agenesis of the right (a mirror-image similarity). The simultaneous appearance of missing teeth (hypodontia) and supernumerary teeth was found in two pairs of twins (1 monozygotic and 1 dizygotic). Monozygotic twins showed a significantly higher concordance rate for hypodontia than did the dizygotic. Out of 9 monozygotic pairs, 8 (88.9%) ...Continue Reading

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