title: Bonding quality of contemporary dental cements to sandblasted esthetic crown copings.
abstract: OBJECTIVE
  To evaluate the shear bond strength of current luting cements to sandblasted crown-coping substrates.
  
  
  METHODS
  Specimens of nickel-chromium, pressable glass ceramic, and zirconia crown-coping substrates were sandblasted in three groups (n = 30 each) with 50 (group 1), 110 (group 2), and 250 μm (group 3) alumina particles at a pressure of 250 kPa. Cylinders of glass ionomer, universal resin, and self-adhesive resin cements were then built up on the sandblasted substrate surfaces of each group (n = 10). All bonded specimens were stressed to evaluate the cement-substrate shear bond strength. Both the mode and incidence of bond failure were also considered.
  
  
  RESULTS
  No difference was noticed between all test groups in terms of cement-substrate bond strength. In comparison to self-adhesive type, the universal resin cement provided lower bond strengths to both metal and glass-ceramic substrates in group 1. The self-adhesive resin cement provided the highest bond strengths to the zirconia substrates in groups 2 and 3. The adhesive type of bond failure was common in the metal and zirconia substrates in all groups.
  
  
  CONCLUSIONS
  Cement-substrate bonding quality is not affected by the size of sandblasting particles. Resin cements bond better to different coping substrates. Self-adhesive resin cement is the best choice to bond zirconia-based substrates.
authors.affiliation: Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia. bedie001@yahoo.com
authors.forename: Khalid M
authors.initials: KM
authors.lastname: Abdelaziz
authors.forename: Nasser M
authors.initials: NM
authors.lastname: Al-Qahtani
authors.forename: Abdulrahman S
authors.initials: AS
authors.lastname: Al-Shehri
authors.forename: Adel M
authors.initials: AM
authors.lastname: Abdelmoneam
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods*; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D019544:Equipment Failure Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength
chemical_list: D003722:Dental Alloys; D005899:Glass Ionomer Cements; D019279:Resin Cements; D003776:Dental Porcelain; D000537:Aluminum Oxide