title: Three-year follow up assessment of Class II restorations in primary molars with a polyacid-modified composite resin and a hybrid composite.
abstract: OBJECTIVE
  To evaluate the 3-year success rate of Class II restorations in primary molars performed with Compoglass, a polyacid-modified resin-based composite (compomer) and TPH-Spectrum, a hybrid resin-based composite.
  
  
  METHODS
  In a dental practice, in each of 52 children at least two primary molars were restored. 96 primary molars were restored with TPH-Spectrum using the total-etching-technique and 94 with Compoglass without acid etching prior to application of the bonding adhesive. The restorations were assessed at baseline (1996) and after 1 and 2 yrs according to the Ryge criteria. After 3 yrs the restorations (46 Compoglass, 46 TPH-Spectrum) of 35 children were re-evaluated.
  
  
  RESULTS
  After 3 yrs the cumulative success rate according to the Kaplan-Meier-estimation was 79.5% for the Compoglass and 85.8% for the TPH-Spectrum restorations. No significant differences were observed between the two materials with respect to color matching, cavosurface discoloration, anatomic form, margin integrity and caries assessment. The present investigation revealed that TPH-Spectrum and Compoglass are suitable materials for restoring primary molars.
  
  
  CONCLUSIONS
  After an observation period of 3 years, both TPH-Spectrum and Compoglass demonstrated acceptable clinical results.
authors.affiliation: Department of Operative and Preventive Dentistry, Georg-August University, Göttingen, Germany. thomas.attin@med.uni-goettingen.de
authors.forename: T
authors.initials: T
authors.lastname: Attin
authors.forename: A
authors.initials: A
authors.lastname: Opatowski
authors.forename: C
authors.initials: C
authors.lastname: Meyer
authors.forename: B
authors.initials: B
authors.lastname: Zingg-Meyer
authors.forename: W
authors.initials: W
authors.lastname: Buchalla
authors.forename: J S
authors.initials: JS
authors.lastname: Mönting
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D003116:Color; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003731:Dental Caries / Q000628:therapy; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005260:Female; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008297:Male; D008963:Molar; D011670:Pulpectomy; D012008:Recurrence; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013499:Surface Properties; D016019:Survival Analysis; D014094:Tooth, Deciduous; D016896:Treatment Outcome
chemical_list: C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; C420128:Spectrum composite resin; C113300:TPH hybrid