title: A new concept and finite-element study on dental bond strength tests.
abstract: Numerous bond strength tests have been performed on dental adhesion experiments. Yet, the validity of these bond strength tests is controversial due to the name (e.g., "shear" or "tensile") may not reflect to the true and complete stress situation, i.e., assumed uniform shear or uniaxial tensile conditions. Thus, the aim of this study was to simulate and compare the stress distribution of and between shear bond strength (SBS), tensile bond strength (TBS), mold-enclosed shear bond strength (ME-SBS) and de novo lever-induced mold-enclosed shear bond strength (LIME-SBS) tests.
  
  
  
  3-Dimensional finite element method (FEM) was used on the dental resin-bonded surfaces (i.e., titanium alloy, dentine and porcelain) interphased with adhesive layer (thickness 5μm) to simulate the mechanical tests. For ME-SBS, both polycarbonate and stainless steel molds were used. For LIME-SBS, stainless steel levers and molds with lengths of 3mm, 6mm, 12mm, 15mm and 18mm were used. The applied loads on these models were 50N, 100N and 200N.
  
  
  
  De novo LIME-SBS test was the most optimal configuration to evaluate "shear" bond strength of adhesive in regards to providing significantly high and uniform shear stress as well as eliminating tensile stress at the interface. The conventional SBS test created very high tensile stress at the load area, whereas the TBS created optimal tensile stress but shear stress indeed co-exist. The ME-SBS test could also eliminate some of the tensile stress. Similar stress distributions pattern appeared on the Ti-adhesive models, the dentine-adhesive models and porcelain-adhesive models.
  
  
  
  None of the bond strength tests could give purely "shear" or "tensile" bond strength, but LIME-SBS seems to be the best model to evaluate the bond strength under true "shear" mode.
authors: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region, P. R. China.
authors: Xiao-Zhuang
authors: XZ
authors: Jin
authors: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region, P. R. China; Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
authors: Ehsan
authors: E
authors: Homaei
authors: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region, P. R. China.
authors: Jukka Pekka
authors: JP
authors: Matinlinna
authors: Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region, P. R. China. Electronic address: jkhtsoi@hku.hk.
authors: James Kit Hon
authors: JKH
authors: Tsoi
mesh_terms: D001840:Dental Bonding; D003738:Dental Cements; D003764:Dental Materials; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003738:Dental Cements; D003764:Dental Materials; D019279:Resin Cements
keywords: Adhesive test; Bond strength; Finite element analysis; Lever-induced mold-enclosed shear bond strength; Shear bond strength; Tensile bond strength