title: Shear bond strength of bis-acryl composite provisional material repaired with flowable composite.
abstract: BACKGROUND
  Time and expense are considerable when refabrication of a bis-acryl composite provisional prosthesis is required, so an effective method of repair is desirable. Attempts at self-repair have been ineffective, and no reports of repair specific to bis-acryl composites were found in the literature.
  
  
  OBJECTIVE
  To investigate the strength of a bis-acryl composite repair using flowable composite after two surface treatments and three storage conditions.
  
  
  METHODS
  Thirty specimens of bis-acryl composite were made and divided into six groups. Half of the specimens received air abrasion only, and half received air abrasion followed by application of an intermediate bonding resin. A flowable composite was then applied to all specimens. Following three different storage conditions, the flowable composite was debonded using a universal testing machine in tensile mode.
  
  
  RESULTS
  All specimens failed cohesively within the bis-acryl composite rather than at the repair interface. Surface treatment with air abrasion alone resulted in significantly higher shear bond strength values than when air abrasion and intermediate bonding resin were combined. Bond strength values were significantly higher in thermocycled specimens than in air-dried specimens.
  
  
  CONCLUSIONS
  Use of air abrasion followed by application of flowable composite proved to be a successful technique for bis-acryl composite repair.
  
  
  CONCLUSIONS
  Repair of bis-acryl composite provisional material with a flowable composite is effective, expedient, and inexpensive.
authors.affiliation: University of the Pacific School of Dentistry, San Francisco, California, USA. mhagge@sf.uop.edu
authors.forename: Mark S
authors.initials: MS
authors.lastname: Hagge
authors.forename: James S
authors.initials: JS
authors.lastname: Lindemuth
authors.forename: Ammon G
authors.initials: AG
authors.lastname: Jones
mesh_terms: D000388:Air; D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D006801:Humans; D016555:Matched-Pair Analysis; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013816:Thermodynamics; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; C451600:OptiBond Solo Plus; D019279:Resin Cements; C102735:Revolution (composite resin); C111840:flowable hybrid composite; D014867:Water; D000537:Aluminum Oxide