title: Evaluation of varied repair protocols applied to aged composite resin.
abstract: OBJECTIVE
  This paper aims to examine varied surface treatments combined with adhesive bonding to ascertain the highest bond strength of the composite resin repair.
  
  
  METHODS
  A total of 100 specimens was made using an increment technique. The prepared specimens were aged for 20 days in 37 degrees +/- 20 degrees C water and then kept for 24 h at room temperature. The samples were separated into 5 groups of 20, and each group then received a different surface treatment (control group, phosphoric acid, diamond bur, air abrasion, silane primer combined with a diamond bur treatment). The effect of each surface treatment on the bond strength was determined by a shear bond test.
  
  
  RESULTS
  Specimens that received surface treatment with a diamond bur exhibited higher shear bond strengths than any of the other repaired groups (p < 0.05). Those treated with air abrasion had the second highest shear bond strengths, but without a statistically significant difference when compared to the control group (p > 0.05). Specimens treated with phosphoric acid showed virtually no difference compared to the specimens of the control group (p > 0.05).
  
  
  CONCLUSIONS
  Statistical analysis revealed that surface treatment with a diamond bur results in higher shear bond strength than other tested methods.
authors.affiliation: Dept. of Restorative Dentistry, University of Manitoba, Winnipeg, Canada. T_Bonstein@umanitoba.ca
authors.forename: Tammy
authors.initials: T
authors.lastname: Bonstein
authors.forename: Davis
authors.initials: D
authors.lastname: Garlapo
authors.forename: John
authors.initials: J
authors.lastname: Donarummo
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Bush
mesh_terms: D020906:Air Abrasion, Dental; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D017269:Dental Prosthesis Repair; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D018130:Diamond; D016014:Linear Models; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D013499:Surface Properties; D016019:Survival Analysis; D013997:Time Factors
chemical_list: D003188:Composite Resins; C420130:Excite cement; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; D012821:Silanes; C452226:tetric flow composite resin; D018130:Diamond; C030242:phosphoric acid