title: [Effects of 3 desensitizers on bond strength of luting agents].
abstract: OBJECTIVE
  To explore the effect of Hybrid Coat, Prime & Bond NT, and anti-sensitivity toothpaste on the bond strength of glass ionomer cement (GIC), polycarboxylat cement (PCC), resin cement (RC), and to provide reference for clinical operations.
  
  
  METHODS
  A total of 96 isolated human premolar samples, which were prepared to expose dentine, were randomly divided into a GIC group, a PCC group, and an RC group. Each group was divided into 4 subgroups according different desensitizers: a control subgroup, a Hybrid Coat subgroup, a Prime & Bond NT subgroup, and an anti-sensitivity toothpaste subgroup (n=8 in each subgroup). After using Hybrid Coat, Prime & Bond NT, and anti-sensitivity toothpaste in the corresponding groups, the castings of cobalt-chromium alloy were bonded to dentine surfaces by GIC, PCC, and RC. All the dentinesurfaces were treated with selected desensitizers. Specimens were tested by a universal testing machine to obtain the shear bond strength of each specimen, and the data of the shear bond strength was analyzed by one-way analysis of variance.
  
  
  RESULTS
  The shear bond strength of GIC significantly was increased in the Hybrid Coat subgroups compared with that in the control subgroups, the Prime & Bond NT subgroups, and the antisensitivity toothpaste subgroups (P<0.05); the shear bond strength of PCC significantly reduced in the Prime & Bond NT subgroups compared with that in the control subgroups, and the antisensitivity toothpaste subgroups(P<0.05); the shear bond strength of RC was obviously enhanced in the anti-sensitivity toothpaste subgroups compared with that in a control subgroup, a Hybrid Coat subgroup, a Prime & Bond NT subgroup (P<0.05).
  
  
  CONCLUSIONS
  When GIC is adopted as adhesive agent, we shoud choose Hybrid Coat; if PCC is chosen, the Prime & Bond NT should be avoided; if RC is chosen to adhere crown, the antisensitivity toothpaste is applicable. Among the selected luting agents, GIC has the lowest shear bond strength while RC has the highest.
authors.affiliation: Stomatology Centre, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Xu
authors.forename: Zhenjie
authors.initials: Z
authors.lastname: Guan
mesh_terms: D001641:Bicuspid; D001840:Dental Bonding; D003738:Dental Cements; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids; D019279:Resin Cements; D033081:Shear Strength
chemical_list: D003738:Dental Cements; D005899:Glass Ionomer Cements; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements