title: Loss of sealant retention and subsequent caries development.
abstract: OBJECTIVE
  To assess the transition process of sealant retention and to determine the effect of sealant loss on subsequent caries. RISK DESIGN: A follow-up study from the day sealants was applied by dental nurses, every six months over a period of 30 months.
  
  
  METHODS
  Mobile dental clinics at primary schools in Songkhla, Thailand.
  
  
  METHODS
  206 first grade primary school children, with 383 first permanent molars.
  
  
  METHODS
  Intermediate outcomes were: three categories of sealant retention: full retention, partial retention and missing sealant. The final outcome was whether occlusal caries was present or not.
  
  
  RESULTS
  The percentages of occlusal surfaces of first permanent molars which were at risk (caries free) at time points 6, 12, 18, 24 and 30 months which became carious during the subsequent six months were 2.4, 8.00, 7.4, 5.4 and 6.1 respectively. Caries incidence was highest in the first year after sealing. Odds ratio of conversion from non-caries to caries between partial retention and missing sealant was 3.07 and between full retention and missing sealant, 0.27.
  
  
  CONCLUSIONS
  Under high caries risk and low retention rate settings, partial retention posed a high risk of caries, suggesting an urgent need to improve sealant performance.
authors.affiliation: Prince of Songkla University, Faculty of Dentistry, Department of Preventive Dentistry, Songkhla, Thailand. sukanya.ti@psu.ac.th
authors.forename: S
authors.initials: S
authors.lastname: Tianviwat
authors.forename: V
authors.initials: V
authors.lastname: Chongsuvivatwong
authors.forename: B
authors.initials: B
authors.lastname: Sirisakulveroj
mesh_terms: D002648:Child; D003731:Dental Caries / Q000453:epidemiology* / Q000517:prevention & control; D003740:Dental Clinics; D003750:Dental Fissures / Q000628:therapy; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008137:Longitudinal Studies; D008390:Markov Chains; D008952:Mobile Health Units; D008963:Molar; D010895:Pit and Fissure Sealants; D015397:Program Evaluation; D012307:Risk Factors; D012571:School Dentistry; D013785:Thailand / Q000453:epidemiology
chemical_list: D010895:Pit and Fissure Sealants