title: Repair Bond Strength of Aged Silorane-based Composite Using Intermediate Adhesive Systems Based on Different Monomers.
abstract: OBJECTIVE
  To investigate the effect of pre-repair aging periods and intermediate adhesive systems based on different monomers on the repair bond strength of silorane-based resin composite.
  
  
  METHODS
  A total of 32 Filtek P90 (3M ESPE) substrate specimens (4 mm diameter and 4 mm height) were made. Substrate specimens were grouped according to the pre-repair time periods into four groups (n = 8/group): 15 to 30 min, 24 h, 1 month, and 3 months. All substrate specimens were ground flat using a diamond stone and were etched using Scotchbond phosphoric acid etchant (3M ESPE). The specimens of each pre-repair time period were equally distributed among the two repair groups, using either silorane-based (P90 System Adhesive) or acrylamide-based (AdheSE One F, Ivoclar Vivadent) intermediate adhesive systems. Specimens of P90 System adhesive received Filtek P90 as the repair resin composite, and Tetric N-Ceram (Ivoclar Vivadent) was used with AdheSE One F specimens. Additional specimens were made from the repair resin composite materials to study the cohesive strength. Specimens were sliced into sticks (0.6 ± 0.01 mm2) for microtensile bond strength testing (μTBS). Modes of failure were determined.
  
  
  RESULTS
  Two-way ANOVA with repeated measures revealed no significant effect for the pre-repair aging periods, intermediate adhesive systems based on different monomers, or their interaction on repair bond strength of silorane-based resin composite.
  
  
  CONCLUSIONS
  Up to 3 months of pre-aging the repaired silorane-based resin composite had no negative effect on its repair bond strength, even when an intermediate adhesive system based on a different monomer (acrylamide) was used.
authors.forename: Ayman M
authors.initials: AM
authors.lastname: El-Amin
authors.forename: Lamia E
authors.initials: LE
authors.lastname: Daifalla
authors.forename: Mohamed H
authors.initials: MH
authors.lastname: Zaazou
authors.forename: Hussein A F
authors.initials: HA
authors.lastname: Gomaa
authors.forename: Enas H
authors.initials: EH
authors.lastname: Mobarak
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D018130:Diamond / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D063065:Organophosphonates / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D062047:Silorane Resins / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; C489662:AdheSE cement; D003188:Composite Resins; D003738:Dental Cements; D063065:Organophosphonates; D012464:Saliva, Artificial; C454540:Scotchbond etchant; D062047:Silorane Resins; C121818:Tetric ceram; C544925:filtek P90; C555513:silorane composite resin; D018130:Diamond