title: The reparability of contemporary composite resins.
abstract: OBJECTIVE
  The objective was to investigate the way that various surface treatments could influence the bond strength of the repair of methacrylate (MC) and silorane (SIL) composites.
  
  
  METHODS
  A total of 160 MC and SIL cylindrical specimens were polymerized and aged in artificial saliva solution for 7 days. Depending on the following surface treatment (diamond bur or air abrasion), and the conditioning procedure (orthophosphoric acid or sodium hypochlorite), 16 groups were formed and repaired either with MC, either with SIL composite. Repaired specimens were subjected to an additional aging procedure in artificial saliva for 7 days, followed by thermo-cycling and then stressed in shear at a rate of 0.5 mm/min until failure. Failure patterns were analyzed using stereomicroscope and scanning electron microscopy.
  
  
  RESULTS
  MC composite showed statistically significant higher bond strength both as a base or repair material than SIL (P < 0.001). Statistically significant differences were not observed, when grinding and conditioning procedures was compared. Pretest failures were observed when aged MC-based composite was repaired with SIL-based.
  
  
  CONCLUSIONS
  Type of composite seems to be the main factor influencing the bond strength of the repair. MC-based composite showed better repairability than SIL composite. Optimum repair conditions should include knowledge of the composite's composition.
authors.affiliation: Department of Operative Dentistry, Dental School of Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Maria
authors.initials: M
authors.lastname: Spyrou
authors.affiliation: Department of Operative Dentistry, Dental School of Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Eugenia
authors.initials: E
authors.lastname: Koliniotou-Koumpia
authors.affiliation: Department of Operative Dentistry, Dental School of Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Pantelis
authors.initials: P
authors.lastname: Kouros
authors.affiliation: Department of Operative Dentistry, Dental School of Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Koulaouzidou
authors.affiliation: Department of Operative Dentistry, Dental School of Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Pavlos
authors.initials: P
authors.lastname: Dionysopoulos
keywords: Bond strength; methacrylate composite; repair; silorane composite; surface treatment