title: A study to investigate the bond strengths of orthodontic brackets bonded to prosthetic acrylic teeth.
abstract: BACKGROUND
  In this study, we compared the shear bond strengths of five different adhesive techniques for attaching metal orthodontic brackets onto acrylic pontics.
  
  
  METHODS
  Two hundred upper left lateral incisor acrylic teeth with bonded brackets were divided into five groups - composite alone (control), composite following sandblasting, composite held with a mechanical undercut, cyanoacrylate adhesive and Panavia(®). The initial bond strength was tested using the Instron Universal Testing Machine. The fatigue bond strength was tested by subjecting each bracket to 5000 repetitive low-load cycles at 50% of the mean shear bond strength using the Dartec machine at 2 Hz.
  
  
  RESULTS
  Cyanoacrylate adhesive statistically exhibited the highest mean bond strength (19·82 MPa). This was followed by the mechanical undercut group (17·69 MPa) and the sandblasted group (17·18 MPa). There was no statistically significant difference when considering the effect of fatiguing (p = 0·238) as well as the interaction between the adhesive technique and the effect of fatiguing on the bond strength (p = 0·440).
  
  
  CONCLUSIONS
  The initial and fatigue bond strengths of the cyanoacrylate adhesive, sandblasted and undercut groups were significantly higher than the control and Panavia(®) groups when tested under laboratory conditions.
authors.forename: Hooi Imm
authors.initials: HI
authors.lastname: Soon
authors.forename: Daljit S
authors.initials: DS
authors.lastname: Gill
authors.forename: Steven P
authors.initials: SP
authors.lastname: Jones
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D055117:Curing Lights, Dental / Q000145:classification; D003487:Cyanoacrylates / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D016910:Orthodontic Brackets; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003487:Cyanoacrylates; D003764:Dental Materials; D008689:Methacrylates; C091744:Panavia TC; D000537:Aluminum Oxide
keywords: Acrylic pontics,; bond strength,; orthodontic bracket