title: Er,Cr:YSGG Laser as a Novel Method for Rebonding Failed Ceramic Brackets.
abstract: OBJECTIVE
  Since there is no standard method for rebonding loose ceramic brackets, the aim of this study was to evaluate the possibility of using Er,Cr:YSGG laser to eliminate the remaining composite materials from the base of ceramic brackets and to compare the bond strength of rebonded brackets with the new ones.
  
  
  METHODS
  Sixty-two extracted human premolars were mounted in acrylic cylinders. Thirty-one ceramic brackets were bonded, and shear bond strength was tested using Hounsfield testing machine. The remnants of the bonding material were removed from the bases of brackets using Er,Cr:YSGG laser. These brackets were rebonded to 31 fresh teeth and again shear bond strength was measured. Pattern of debonding was assessed in both cases under a stereomicroscope and graded according to ARI index. Data were analyzed with independent t-test and Fisher's exact test.
  
  
  RESULTS
  Mean shear bond strength of the bond and rebond groups was 12.29 ± 5.46 and 10.58 ± 5.16 MPa, respectively. There were no significant differences between the two groups (p = 0.21). Pattern of bond failure was not statistically different between the two groups.
  
  
  CONCLUSIONS
  Er,Cr:YSGG laser was effective in removing the remnants of bonding material from the base of ceramic brackets without any interference with the ceramic base itself, demonstrating that it might be a suitable method for rebonding ceramic brackets.
authors: 1 Orthodontics Department, Faculty of Dentistry, Tabriz University of Medical Sciences , Ilam, Iran .
authors: Aydin
authors: A
authors: Sohrabi
authors: 2 Orthodontics Department, Faculty of Dentistry, Ilam University of Medical Science , Ahwaz, Iran .
authors: Sanaz
authors: S
authors: Jafari
authors: 3 Operative Dentistry Department, Faculty of Dentistry, Tabriz University of Medical Sciences , Tabriz, Iran .
authors: Soodabeh
authors: S
authors: Kimyai
authors: 3 Operative Dentistry Department, Faculty of Dentistry, Tabriz University of Medical Sciences , Tabriz, Iran .
authors: Sahand
authors: S
authors: Rikhtehgaran
mesh_terms: D001641:Bicuspid; D002516:Ceramics; D001840:Dental Bonding / Q000379:methods*; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State; D016910:Orthodontic Brackets