title: Fracture Strength After Fatigue Loading of Lithium Disilicate Pressed Zirconia Crowns.
abstract: OBJECTIVE
  The aim of this study was to evaluate the fracture resistance of fatigued lithium disilicate pressed zirconia crowns versus other ceramic crowns.
  
  
  METHODS
  Lithium disilicate pressed zirconia, fluorapatite pressed zirconia, monolithic lithium disilicate, and monolithic zirconia crowns were fabricated. Cyclic and static loadings were applied to the mesiobuccal cusp tip after thermocycling and fracture strengths were recorded.
  
  
  RESULTS
  Fatigued lithium disilicate pressed zirconia crowns were found to have a fracture resistance of 9,117.81 ± 727.04 N, compared with 9,240.61 ± 887.21 N for monolithic zirconia crowns, 3,030.18 ± 1,505.83 N for fluorapatite pressed zirconia crowns, and 4,173.94 ± 877.46 N for monolithic lithium disilicate crowns (P = .001).
  
  
  CONCLUSIONS
  This in vitro study shows that fatigued lithium disilicate pressed zirconia and monolithic zirconia crowns have better fracture resistance than fluorapatite pressed zirconia and monolithic lithium disilicate crowns.
authors.forename: So-Yeun
authors.initials: SY
authors.lastname: Kim
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Choi
authors.forename: Sung-Won
authors.initials: SW
authors.lastname: Ju
authors.forename: Jin-Soo
authors.initials: JS
authors.lastname: Ahn
authors.forename: Mi-Jung
authors.initials: MJ
authors.lastname: Yoon
authors.forename: Jung-Bo
authors.initials: JB
authors.lastname: Huh
mesh_terms: D003442:Crowns; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D050723:Fractures, Bone / Q000503:physiopathology* / Q000628:therapy*; D006801:Humans; D010865:Pilot Projects; D014070:Tooth / Q000601:surgery*; D018677:Tooth Injuries / Q000601:surgery*; D015040:Zirconium
chemical_list: C493120:lithia disilicate; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide