title: Repairing a preveneered stainless steel crown with two different materials.
abstract: OBJECTIVE
  The objective of this study was to determine the in vitro shear bond strength of 2 different repair materials for anterior preveneered stainless steel crowns (SSCs) after bond failure in the prefabricated veneers.
  
  
  METHODS
  Sixteen preveneered anterior SSCs were used. Each of the preveneered crowns was cemented with a luting glass ionomer cement onto cast die. Each die was placed into a mechanical testing machine. A force was applied on the veneer at the incisal edge, with a crosshead speed of 0.05 inches/minute until the initial original facial facing material fractured or dislodged. Fracture or dislodgment failure of the initial original facial facings was evaluated and photographed. Specimens were divided into 2 equal repairing procedure groups. Group 1 was repaired using Tetric Flow, a flowable resin composite. Group 2 was repaired using Major Resin, a crown and bridge veneering resin. After the repairing procedure, crowns were stored in water at room temperature for 24 hours and then thermocycled. The crowns repaired were debonded in the test machine in the same manner as the initial facial facing fracture test. The debonding failure of the repaired crowns also was evaluated and photographed.
  
  
  RESULTS
  There was a statistically significant difference between the initial original veneer material and groups 1 and 2 (P < .000) and between groups 1 and 2 (P < .001).
  
  
  CONCLUSIONS
  In this in vitro study, it was determined that shear forces of the repair materials were lesser than bond forces of the original veneer material to the stainless steel metal base.
authors.affiliation: Department of Pedodontics, Atatürk University, Faculty of Dentistry, Erzurum, Turkey. yyilmaz25@atauni.edu.tr
authors.forename: Yucel
authors.initials: Y
authors.lastname: Yilmaz
authors.forename: Asude
authors.initials: A
authors.lastname: Yilmaz
mesh_terms: D003188:Composite Resins; D003442:Crowns; D001840:Dental Bonding; D017005:Dental Debonding; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis; D003801:Dental Veneers; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D013193:Stainless Steel
chemical_list: D003188:Composite Resins; D019279:Resin Cements; C452226:tetric flow composite resin; D013193:Stainless Steel