title: Effects of different cavity designs on fracture load of fiber-reinforced adhesive fixed dental prostheses in the anterior region.
abstract: OBJECTIVE
  To evaluate the fracture strength of inlay-retained, surface-retained, and cantilevered fiber-reinforced adhesively fixed dental prostheses (FRA-FDPs) in the anterior region.
  
  
  METHODS
  Thirty-two sound human right central incisors and canines were divided into four groups. Test groups were as follows: group 1, both teeth had deep cavity preparation; group 2, both teeth had shallow cavity preparation; group 3, only the canine teeth had deep cavity preparation; group 4, no preparation was made on the abutment teeth. Lateral pontics were restored with FRA-FDPs. All restorations were subjected to fracture loading from the lateral pontic. The restorations were tested in a universal testing machine (LRX Material Testing Machine) with a crosshead speed of 1 mm/min. One-way ANOVA was used for statistical analyses. Fracture modes were examined visually.
  
  
  RESULTS
  The highest (667.3 ± 90.4 N) and the lowest (409.3 ± 158.1 N) debonding values were found for groups 4 and 3, respectively.
  
  
  CONCLUSIONS
  Different preparation designs (inlay-retained, surface-retained) had no significant effect on fracture strength of FRA-FDPs in the anterior region. However, a cantilever design exhibited significantly lower fracture strength. Delamination of the veneering composite was observed as the primary failure type after fracture tests.
authors.affiliation: Department of Prosthodontics, Hacettepe University, Ankara, Turkey. g_emul@yahoo.com
authors.forename: Guliz
authors.initials: G
authors.lastname: Aktas
authors.forename: Emine Goncu
authors.initials: EG
authors.lastname: Basara
authors.forename: Erdal
authors.initials: E
authors.lastname: Sahin
authors.forename: Sadullah
authors.initials: S
authors.lastname: Uctasli
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
authors.forename: Lippor V
authors.initials: LV
authors.lastname: Lassila
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D003481:Cuspid; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003801:Dental Veneers; D003779:Denture Design; D003781:Denture Retention / Q000379:methods*; D016379:Denture, Partial, Fixed, Resin-Bonded; D005898:Glass; D006801:Humans; D007180:Incisor; D007284:Inlays; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; D019279:Resin Cements; C009753:fiberglass