title: Prevalence of developmental dental hard-tissue anomalies and association with caries and oral hygiene status of children in Southwestern, Nigeria.
abstract: BACKGROUND
  Developmental dental hard tissue anomalies are often associated with oral health problems. This study determined the clinical prevalence of developmental dental hard tissue anomalies in the permanent dentition of children resident in southwestern Nigeria and its association with dental caries and poor oral hygiene status.
  
  
  METHODS
  This was a cross-sectional study recruiting 1565 school children, 12 to 15 year old attending schools in Ibadan, Oyo State and Ile-Ife, Osun State. All eligible study participants had oral examinations conducted to determine presence of developmental hard dental tissue anomalies, caries and oral hygiene status. The prevalence of developmental dental hard tissue anomalies was determined. Logistic Poisson regression was used to determine the association of between developmental dental hard tissue anomalies, caries and oral hygiene status.
  
  
  RESULTS
  Only 65 (4.2 %) children had clinically diagnosed developmental dental hard tissue anomalies. The most prevalent anomaly was enamel hypoplasia (2.2 %). More females (p = 0.003) and more children with middle socioeconomic class (p = 0.001) had enamel hypoplasia. The probability of having poor oral hygiene was significantly increased for children with developmental dental anomalies (APR: 0.07; 95 % CI: 0.03 - 0.12; p = 0.002). The probability of having caries was insignificantly increased for children with developmental dental hard tissue anomalies (APR: 0.005; 95 % CI: -0.03 - 0.04; p = 0.08).
  
  
  CONCLUSIONS
  The most prevalence clinically detectable developmental dental hard tissue anomalies for the study population was enamel hypoplasia. The presence of developmental dental hard tissue anomalies significantly increased the chances of having poor oral hygiene but not caries. Further studies are required to understand if poor oral hygiene is associated with dental caries in children with developmental dental hard tissue anomalies.
authors.affiliation: Department of Child Oral Health, College of Medicine, University of Ibadan, Oyo State, Nigeria. olubukolap@gmail.com.|Department of Child Oral Health, Faculty of Dentistry, College of Medicine, University of Ibadan, Oyo State, Nigeria. olubukolap@gmail.com.
authors.forename: Bamidele O
authors.initials: BO
authors.lastname: Popoola
authors.affiliation: Department of Child Dental Health, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Nigeria.
authors.forename: Nneka
authors.initials: N
authors.lastname: Onyejaka
authors.affiliation: Department of Child Dental Health, Obafemi Awolowo University, Ile-Ife, Nigeria.
authors.forename: Morenike O
authors.initials: MO
authors.lastname: Folayan
mesh_terms: D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D004245:DMF Index; D003731:Dental Caries / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D009549:Nigeria / Q000453:epidemiology; D009910:Oral Hygiene; D015995:Prevalence
keywords: Anomalies; Dental caries; Dental hard-tissue; Developmental; Oral hygiene