title: Comparison of the bond strength of ceramics to Co-Cr alloys made by casting and selective laser melting.
abstract: OBJECTIVE
  Considering the importance of metal-ceramic bond, the present study aimed to compare the bond strength of ceramics to cobalt-chrome (Co-Cr) alloys made by casting and selective laser melting (SLM).
  
  
  METHODS
  In thisin-vitroexperimental study, two sample groups were prepared, with one group comprising of 10 Co-Cr metal frameworks fabricated by SLM method and the other of 10 Co-Cr metal frameworks fabricated by lost wax cast method with the dimensions of 0.5 × 3 × 25 mm (following ISO standard 9693). Porcelain with the thickness of 1.1 mm was applied on a 3 × 8-mm central rectangular area of each sample. Afterwards, bond strengths of the samples were assessed with a Universal Testing Machine. Statistical analysis was performed with Kolmogorov-Smirnov test and T-test.
  
  
  RESULTS
  Bond strength in the conventionally cast group equaled 74.94 ± 16.06 MPa, while in SLM group, it equaled 69.02 ± 5.77 MPa. The difference was not statistically significant (P≤ .05).
  
  
  CONCLUSIONS
  The results indicated that the bond strengths between ceramic and Co-Cr alloys made by casting and SLM methods were not statistically different.
authors.affiliation: Prosthodontics Department, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Shirin
authors.initials: S
authors.lastname: Lawaf
authors.affiliation: Prosthodontics Department, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Shahbaz
authors.initials: S
authors.lastname: Nasermostofi
authors.affiliation: Prosthodontics Department, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Mahtasadat
authors.initials: M
authors.lastname: Afradeh
authors.affiliation: Oral Medicine Department, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Arash
authors.identifier: 0000-0001-9219-1219
authors.initials: A
authors.lastname: Azizi
keywords: Bond strength; Co-Cr alloy; Metal-ceramic restorations; Selective laser melting