title: A multipractice clinical evaluation of an ORMOCER restorative--2-year results.
abstract: OBJECTIVE
  This ongoing prospective study evaluates the clinical performance of an ORMOCER restorative material (Definite; Degussa) in combination with a self-conditioning adhesive (Etch & Prime 3.0; Degussa).
  
  
  METHODS
  Three hundred fifty-six restorations (48 Class I, 150 Class II, 63 Class III, 32 Class IV, and 63 Class V) in 117 patients (17 to 65 years) were placed by 5 operators at 5 centers. Fillings were placed with cotton roll isolation using clear matrix bands for Classes III and IV and metal matrix bands for Class II restorations. Follow-ups took place after 6, 12, and 24 months whereby modified Ryge criteria were recorded. With 33 randomly selected Class I and II restorations, measurements of occlusal wear (3-dimensional laser scanner) and marginal analyses (scanning electron microscope) were done using replicas.
  
  
  RESULTS
  At 24 months, 307 restorations were available for evaluation. The cumulative number of losses in the 5 cavity classes (I, II, III, IV, and V) and the percentages of scores for the clinical parameters in the 4 categories (Alfa, Beta, Charlie, and Delta) of the retained restorations were loss (1/ 6/ -/ 2/ 7), marginal integrity (93.1/ 6.9/-/-), marginal discoloration (73.5/ 25.5/ 1/ -), anatomic form (82.8/17.2/-/-), and fracture (93.1/ 6.9/-/ -). Marginal analysis showed 48.7% "continuous margin" initially and 13.2% at 24 months (difference statistically significant, a = 0.05). Occlusal wear at 24 months was 12.3 Microm for premolars and 21.4 Microm for molars.
  
  
  CONCLUSIONS
  The overall clinical performance of the ORMOCER restorative over 24 months was acceptable with concerns related to marginal quality and to retention of Class V restorations.
authors.affiliation: Department of Restorative Dentistry, Periodontology and Pediatric Dentistry, University of Greifswald, Germany. rosin@uni-greifswald.de <rosin@uni-greifswald.de>
authors.forename: Michael
authors.initials: M
authors.lastname: Rosin
authors.forename: Christian
authors.initials: C
authors.lastname: Schwahn
authors.forename: Bernd
authors.initials: B
authors.lastname: Kordass
authors.forename: Corinna
authors.initials: C
authors.lastname: Konschake
authors.forename: Uwe
authors.initials: U
authors.lastname: Greese
authors.forename: Dirk
authors.initials: D
authors.lastname: Teichmann
authors.forename: Axel
authors.initials: A
authors.lastname: Hartmann
authors.forename: Georg
authors.initials: G
authors.lastname: Meyer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002516:Ceramics / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D017268:Dental Prosthesis Retention / Q000706:statistics & numerical data*; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear / Q000706:statistics & numerical data*; D006801:Humans; D007834:Lasers; D008875:Middle Aged; D063225:Organically Modified Ceramics; D011446:Prospective Studies; D012821:Silanes / Q000737:chemistry*; D018709:Statistics, Nonparametric
chemical_list: D003764:Dental Materials; D063225:Organically Modified Ceramics; D012821:Silanes