title: Effect of luting cements on the compressive strength of Turkom-Cera all-ceramic copings.
abstract: OBJECTIVE
  The objective of this study is to investigate the effect of different luting agents on the fracture strength of Turkom-Cera all-ceramic copings.
  
  
  METHODS
  Standardized metal dies were duplicated from a prepared maxillary first premolar tooth using non-precious metal alloy (Wiron 99). Thirty Turkom-Cera copings of 0.6 mm thickness were then fabricated. Three types of luting agents were used: zinc phosphate cement (Elite), glass-ionomer cement (Fuji I), and a dual-cured composite resin cement (Panavia F). Ten copings were cemented with each type. All copings were cemented to their respective dies according to manufacturer's instructions and received a static load of 5 kg for ten minutes. After 24 hours of storage in distilled water at 37 degrees C, the copings were vertically loaded until fracture using an Instron Universal Testing Machine at a crosshead speed of 1 mm/minute. The mode of fracture was then determined.
  
  
  RESULTS
  Statistical analysis carried out using analysis of variance (ANOVA) revealed significant differences in the compressive strength between the three groups (P<0.001). The mean fracture strength (in Newtons) of Turkom-Cera copings cemented with Elite, Fuji I, and Panavia F were 1537.4 N, 1294.4 N, and 2183.6 N, respectively.
  
  
  CONCLUSIONS
  Luting agents have an influence on the fracture resistance of Turkom-Cera copings.
authors.affiliation: Department of Conservative Dentistry of the Faculty of Dentistry at the University of Malaya in Kuala Lumpur, Malaysia. makramani@yahoo.com
authors.forename: Bandar M A
authors.initials: BM
authors.lastname: Al-Makramani
authors.forename: Abdul A A
authors.initials: AA
authors.lastname: Razak
authors.forename: Mohamed I
authors.initials: MI
authors.lastname: Abu-Hassan
mesh_terms: D000537:Aluminum Oxide; D000704:Analysis of Variance; D001641:Bicuspid; D002484:Cementation; D016009:Chi-Square Distribution; D019245:Compressive Strength; D003442:Crowns; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D012821:Silanes; D018709:Statistics, Nonparametric; D015036:Zinc Phosphate Cement
chemical_list: C086610:GC Elite Type I; D005899:Glass Ionomer Cements; C438843:Panavia-Fluoro; D019279:Resin Cements; D012821:Silanes; D003776:Dental Porcelain; C084541:Fuji glass-ionomer lining cement; D015036:Zinc Phosphate Cement; D000537:Aluminum Oxide