title: An epidemiological study of dental agenesis in a primary health area in Spain: estimated prevalence and associated factors.
abstract: OBJECTIVE
  To evaluate the prevalence of dental agenesis and its possible association with other developmental dental anomalies and systemic entities.
  
  
  METHODS
  Descriptive transversal study, for which 1518 clinical records, of patients visited by the Odontological Service of the Primary Health Centre of Cassà de la Selva (Girona-Spain) between December 2002 and February 2006 were reviewed. The data were recorded in relation to the oral and dental anomalies and the associated systemic entities, between the ones referred as concomitant in literature.
  
  
  RESULTS
  Values of 9.48% (7.25% excluding the third molars) for dental agenesis and 0.39% for oligodontia were obtained. The presence of dental agenesis concomitant with some other forms of oral and dental anomalies was observed. Attention must be drawn to the fact that a greater number of concomitant systemic entities were observed in those patients that presented a severe phenotypical pattern of dental agenesis.
  
  
  CONCLUSIONS
  The results of the present study do not differ from the ones reported in studies of similar characteristics among Occidental and Spanish populations. The relationship observed between certain systemic entities and developmental dental anomalies suggest a possible common genetic etiology.
authors.affiliation: Human Anatomy and Embryology Unit, Campus de Bellvitge, Barcelona University, 5305, Pavelló de Govern, 5a planta, Feixa Llarga, s/n, 08907 - L'Hospitalet del Llobregat, Barcelona, Spain. vtallon@ub.edu
authors.forename: Victòria
authors.initials: V
authors.lastname: Tallón-Walton
authors.forename: Pekka
authors.initials: P
authors.lastname: Nieminen
authors.forename: Sirpa
authors.initials: S
authors.lastname: Arte
authors.forename: Patricia
authors.initials: P
authors.lastname: Carvalho-Lobato
authors.forename: Josep Maria
authors.initials: JM
authors.lastname: Ustrell-Torrent
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Manzanares-Céspedes
mesh_terms: D000848:Anodontia / Q000453:epidemiology*; D002391:Catchment Area, Health; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D011320:Primary Health Care; D012307:Risk Factors; D013030:Spain / Q000453:epidemiology