Česká Stomatologie a Praktické Zubní Lékařství (Mar 2014)
Tooth Agenesis and Associated Tooth Developmental Anomalies
Abstract
Aim of study: Tooth agenesis means absence or incomplete development of tooth. It is the most common developmental dental anomaly in man. The prevalence of agenesis in permanent dentition (excluding third molars) in common population oscillates between 2.6% and 11.3%. It is frequently associated with other dental developmental anomalies. Reasons of this are complex interactions of gens. The same genetic defect may give rise to different phenotypes, including tooth agenesis, microdontia, peg-shaped lateral incisor, palatally displaced canines, taurodontism and delayed formation and eruption of other teeth. This paper aims to investigate the epidemiology of tooth absence (excluding third molars) and associated dental anomalies in the Olomouc Region. Material and methods: Study was conducted at Institute of Dentistry and Oral Sciences, Faculty of Medicine and Dentistry, Palacký University Olomouc from 1. 10. 2010 to 1. 2. 2013. For this study, patients aged between eight to 19 years were selected. Clinical and radiographic examinations were performed. Results: Tooth agenesis was found in 41 of 434 individuals, 18 boys, 23 girls (prevalence 9.45%), excluding third molars. 95% of these 41 patients had at least one of the other dental developmental anomalies. Persistence of deciduous molars (prevalence 56.25%), peg-shaped lateral incisor (prevalence 14.29%), infraocclusion of deciduous molars (prevalence 12.50%) and taurodontism (prevalence 12.20%) were the most often other dental developmental anomalies. Conclusion: The results were compared with the results of similar domestic and foreign studies. There are no statistically significant differences between the results of these studies in the levels of prevalence of agenesis of teeth except third molars. Statistical comparison of other developmental anomalies was not possible because of differences in the methods of the research.
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