title: Longevity of posterior resin composite restorations in permanent teeth in Public Dental Health Service: a prospective 8 years follow up.
abstract: OBJECTIVE
  To investigate in a prospective follow up the longevity of posterior resin composites (RC) placed in permanent teeth of children and adolescents attending Public Dental Health Service.
  
  
  METHODS
  All posterior RC placed, in the PDHS clinics in the cities of Copenhagen and Frederiksberg in Denmark between November 1998 and December 2002, in permanent teeth of children and adolescents up to 18 years, were evaluated in an up to 8 years follow up. The endpoint of each restoration was defined, when repair or replacement was performed. Survival analyses were performed between subgroups with Kaplan-Meier analysis. The individual contribution of different cofactors to predict the outcome was performed with Cox regression analysis.
  
  
  RESULTS
  Totally 2881 children with a mean age of 13.7 years (5-18) received 4355 RC restorations placed by 115 dentists. Eighty percent were placed in molars and 49% were Class I. Two percent of restorations with base material and 1% of the restorations without base material showed postoperative sensitivity (n.s.). Replacements were made in 406 and repairs in 125 restorations. Kaplan-Meier analysis showed a cumulative survival at 8 years of 84.3%, resulting in an annual failure rate of 2%. Lower patient age, more than one restoration per patient, placement of a base material and placement of RC: in molars, in cavities with high number of surfaces, in lower jaw teeth, showed all significant higher failure rates. Five variables had significant importance for the end point, replacement/repair of the resin composite restorations: age of patient, age of operator, jaw, tooth type and cavity size.
  
  
  CONCLUSIONS
  Posterior RC restorations placed in children and adolescents in Public Dental Health clinics showed an acceptable durability with annual failure rates comparable with those of randomized controlled RC studies in adults.
authors.affiliation: Institute of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Nörre Allé 20, DK-2200 Copenhagen, 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; D002675:Child, Preschool; D003188:Composite Resins; D003718:Denmark; D003752:Dental Health Services; D019232:Dental Restoration Failure / Q000706:statistics & numerical data; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods / Q000706:statistics & numerical data*; D003807:Dentin Sensitivity / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D016016:Proportional Hazards Models; D011446:Prospective Studies; D013997:Time Factors
chemical_list: D003188:Composite Resins