title: Fracture resistance of 3 types of primary esthetic stainless steel crowns.
abstract: OBJECTIVE
  Demand is increasing for esthetic restorations in pediatric dentistry. When full coverage is indicated, one option is to use esthetic stainless steel crowns (SSCs). However, this type of crown is prone to fracture. The purpose of this study was to evaluate the fracture resistance of 3 types of esthetic SSCs.
  
  
  METHODS
  Esthetic SSCs for first primary mandibular molars were cemented to idealized epoxy dies with glass ionomer cement. The die-crown units were fractured on a universal testing machine. The force was delivered by a stainless steel ball fixture, set in a uniaxial lever to replicate a cusp contact, with a crosshead speed of 1 mm/min. The differences among the 3 types of crown, in terms of force required to fracture, were compared statistically by 1-way analysis of variance. Pairwise comparisons were performed with Fisher's protected least significant difference test, at an overall significance level of 5%.
  
  
  RESULTS
  The force required to fracture, expressed as average ± standard error, did not differ significantly among the 3 brands of esthetic SSCs: 1730 N ± 50 N, 1826 N ± 62 N and 1671 N ± 68 N, respectively (p = 0.19), well below the maximum bite force of pediatric patients determined in a previous study.
  
  
  CONCLUSIONS
  Esthetic SSCs should be able to resist occlusal forces over short clinical periods. However, long-term occlusal loading and fatigue failures should be taken into account when evaluating the success of this type of crown.
authors: sbeattie@iupui.edu
authors: Sean
authors: S
authors: Beattie
authors: Burak
authors: B
authors: Taskonak
authors: James
authors: J
authors: Jones
authors: Judith
authors: J
authors: Chin
authors: Brian
authors: B
authors: Sanders
authors: Angela
authors: A
authors: Tomlin
authors: James
authors: J
authors: Weddell
mesh_terms: D001732:Bite Force; D002484:Cementation / Q000379:methods; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D004955:Esthetics, Dental; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008963:Molar / Q000473:pathology; D013193:Stainless Steel / Q000737:chemistry*; D013314:Stress, Mechanical; D014094:Tooth, Deciduous / Q000473:pathology
chemical_list: D003722:Dental Alloys; D005899:Glass Ionomer Cements; D013193:Stainless Steel