title: The microtensile strength of bonding resins.
abstract: BACKGROUND
  The purpose of this study was to determine the effect of water on the tensile strength of three bonding resins (All Bond 2, Scotchbond Multi-Purpose Adhesive, Clearfil LB Bond) and a low viscosity resin composite (Protect Liner F) after 1, 7, 28, 84 and 168 days of storage.
  
  
  METHODS
  Cylinders of bonding resin 2.4 +/- 0.2 mm diameter and 9.5 mm long were made and stored at 37 degrees C for 24 hours. The specimens were milled into dumb-bell shapes and stored in either air or water at 37 degrees C. Five specimens of each material were stressed in tension after the specified storage times at a crosshead speed of 1 mm/min in a testing jig attached to a universal testing machine. The mean tensile strengths of bonding resins were calculated and analysed statistically using one-way analysis of variance, lower standard deviation and student t-tests.
  
  
  RESULTS
  Comparison of the air and water samples at all test periods showed the tensile strengths of specimens stored in water were significantly less than those stored in air (P < 0.001).
  
  
  CONCLUSIONS
  The effect of water on the tensile strength of bonding resins indicated a slight decrease in strength of each material over the 168 day test period, whereas the air samples showed little change over the test period.
authors.affiliation: School of Dental Science, University of Melbourne.
authors.forename: L C
authors.initials: LC
authors.lastname: Hogan
authors.forename: M F
authors.initials: MF
authors.lastname: Burrow
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding; D017220:Dentin-Bonding Agents; D004356:Drug Storage; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements; D013718:Tensile Strength; D013997:Time Factors; D014783:Viscosity; D014867:Water
chemical_list: C084544:Clearfil Linerbond System; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C409388:Protect Liner F; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D014867:Water; C100742:All-Bond 2