title: Wear and repair of stainless steel crowns.
abstract: OBJECTIVE
  The purpose of this study was to determine the wear of stainless steel crowns (SSCs) in children, and compare the extent of microleakage in SSCs that had been repaired using either a cermet glass-ionomer cement (GIC) or a packable composite resin (CR).
  
  
  METHODS
  For the first aim, the occlusal surface thickness of 31 harvested SSCs (21 primary first and 10 second molars) and 18 unused SSCs was measured, and then examined under scanning electron microscopy. For the second aim, standardised holes were prepared on the occlusal surfaces of 20 SSCs, and then repaired using either a cermet GIC or packable CR. After their repair, the extent of microleakage was determined using 0.5% basic fuchsin and stereomicroscopy.
  
  
  RESULTS
  The thickness of all the harvested SCCs was 5.3 μm less than that of the unused SCCs (p<0.02), and there were no significant differences between the thickness and occlusal wear rates of harvested SSCs from the first and second primary molars. Although neither of the two repair materials completely prevented microleakage, the number of specimens in which microleakage occurred after repair with a cermet GIC was significantly lower than the number of specimens in which a packable CR was used (p<0.05).
  
  
  CONCLUSIONS
  We concluded that the occlusal surfaces of SSCs for first and second primary molars display wear. Although perforated SSCs can be repaired using either a cermet GIC or a packable CR, less microleakage occurs in SSCs that were repaired with a cermet GIC than those with a packable CR.
authors: Faculty of Dentistry, Atatürk University, Erzurum, Turkey. yyilmaz25@gmail.com
authors: Y
authors: Y
authors: Yilmaz
authors: N Belduz
authors: NB
authors: Kara
authors: A
authors: A
authors: Yilmaz
authors: H
authors: H
authors: Sahin
mesh_terms: D016722:Cermet Cements / Q000627:therapeutic use; D002648:Child; D002675:Child, Preschool; D003188:Composite Resins / Q000627:therapeutic use; D003442:Crowns; D001840:Dental Bonding; D019140:Dental Care for Children / Q000295:instrumentation*; D003763:Dental Leakage / Q000517:prevention & control; D017269:Dental Prosthesis Repair / Q000379:methods*; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D013193:Stainless Steel; D016019:Survival Analysis; D014094:Tooth, Deciduous
chemical_list: D016722:Cermet Cements; D003188:Composite Resins; D013193:Stainless Steel