title: Comparison of resin push-out strength to root dentin of bovine- and human-teeth.
abstract: OBJECTIVE
  To compare the push-out strength of bovine- and human-root dentin and, thus, evaluate the suitability of bovine-root dentin to substitute human-root dentin for bond strength testing.
  
  
  METHODS
  Ten single-rooted human-teeth and ten bovine incisors were prepared using a #3 bur of a fiber post system (12 mm long). The posts were duplicated with resin cement (Duolink). The root canals were treated with All Bond 2 adhesive system and the resin posts were cemented using Duolink. The specimens were cut perpendicular to their long axis, yielding disc-specimens with 1.5 mm thickness, which were submitted to a push-out test (1 mm/min). Ten bond strength values per group (n = 10) were used for statistical analysis (Student t test, alpha =.05).
  
  
  RESULTS
  Statistically significant differences were found for the bond strength values between bovine- (4.1 +/- 1.3 MPa) and human-root dentin (8.6 +/- 5.7 MPa) (P =.0001).
  
  
  CONCLUSIONS
  The push-out strengths of bovine- and human-root dentin were statistically different.
authors.affiliation: Division of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria, Brazil.
authors.forename: Graziela
authors.initials: G
authors.lastname: Galhano
authors.forename: Renata Marques
authors.initials: RM
authors.lastname: de Melo
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000592:standards*; D018772:Dental Marginal Adaptation / Q000592:standards; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000379:methods*; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000592:standards*; D004195:Disease Models, Animal; D006801:Humans; D011176:Post and Core Technique; D012015:Reference Standards; D019279:Resin Cements / Q000592:standards*; D018915:Root Canal Preparation / Q000379:methods; D018709:Statistics, Nonparametric; D014092:Tooth Root / Q000648:ultrastructure
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements