title: A prospective 8-year follow-up of posterior resin composite restorations in permanent teeth of children and adolescents in Public Dental Health Service: reasons for replacement.
abstract: OBJECTIVE
  The aim of the study was to investigate reasons for replacement and repair of posterior resin composite (RC) restorations placed in permanent teeth of children and adolescents attending Public Dental Health Service in Denmark.
  
  
  METHODS
  All posterior RC placed consecutively by 115 dentists over a period of 4 years were evaluated at baseline and up to 8 years later. The endpoint of each restoration was defined when repair or replacement was performed. The influence of patient, dentist and material factors on reasons for repair or replacement was investigated.
  
  
  RESULTS
  A total of 4,355 restorations were placed. Replacements comprised 406 and repairs 125 restorations. The cumulative survival rate at 8 years was 84 %. Failed restorations were most frequently seen due to secondary caries (57 %), post-operative sensitivity (POS) (10 %) and RC fracture (6 %). POS was observed in 1.5 % of the evaluations and reported more often in girls and from teeth restored with a base material. Older dentists showed lower proportion of replaced restorations due to secondary caries than younger dentists.
  
  
  CONCLUSIONS
  Posterior RC restorations in children and adolescents performed in general practice showed a good durability with annual failure rates of 2 %. The main reason for failure was secondary caries followed by post-operative sensitivity and resin composite fracture. A high proportion of replaced/repaired RC restorations were caused by primary caries in a non-filled surface.
  
  
  CONCLUSIONS
  Secondary caries was the main reason for failure of RC in children and young adults. More teeth with post-operative sensitivity and a shorter longevity of restorations were observed when a base material was used.
authors.affiliation: Section of Cariology & Endodontics and Paediatric Dentistry & Clinical Genetcs, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Nörre Alle 20, 2200, Copenhagen N, Denmark, ul@sund.ku.dk.
authors.forename: Ulla
authors.initials: U
authors.lastname: Pallesen
authors.forename: Jan W V
authors.initials: JW
authors.lastname: van Dijken
authors.forename: Jette
authors.initials: J
authors.lastname: Halken
authors.forename: Anna-Lena
authors.initials: AL
authors.lastname: Hallonsten
authors.forename: Ruth
authors.initials: R
authors.lastname: Höigaard
mesh_terms: D000293:Adolescent; D002648:Child; D003188:Composite Resins; D003718:Denmark; D003752:Dental Health Services; D003793:Dental Restoration, Permanent; D006801:Humans; D011446:Prospective Studies; D011636:Public Health Dentistry
chemical_list: D003188:Composite Resins