title: Effect of different conditioning protocols on the adhesion of a glass ionomer cement to dentin.
abstract: OBJECTIVE
  The purpose of this study was to assess the effect of different surface treatments on the shear bond strength (SBS) of a resin modified glass ionomer cement (RMGIC) to dentin.
  
  
  METHODS
  Forty human third molar teeth were randomly divided into four groups (n=10). The occlusal enamel was removed to obtain a flat surface of dentin. Each group was treated as follows: Group 1: 10% polyacrylic acid (positive control); Group 2: 37% phosphoric acid followed by 5% sodium hypochlorite (NaOCl); Group 3: 1.1% APF gel; and Group 4: no conditioning (negative control). Fuji II LC glass ionomer was bonded to dentin using a cylindrical mold. Samples were thermocycled and debonded using a shear force with a crosshead speed of 0.5 mm/min. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey tests (a = 0.05).
  
  
  RESULTS
  The mean SBS in Groups 1 through 4 were 11.562+/-3.148, 8.060+/-1.781, 8.830+/-1.554, and 3.074+/-0.784 (MPa), respectively. There were significant differences in the SBS between Group 1 with other groups (P<0.05). There were no statistically significant differences between Groups 2 and 3, but the SBS of both of them were significantly higher than that of Group 4 (P<0.05).
  
  
  CONCLUSIONS
  Although the dentin SBS of Fuji II LC after conditioning with APF and phosphoric acid followed by NaOCl was greater than the unconditioned group (Group 4), polyacrylic acid yielded the best result.
  
  
  CONCLUSIONS
  Proper conditioning of dentin is effective in promoting close adaptation of RMGIC to dentin.
authors: Department of Restorative Dentistry, Mashhad Dental School and Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. hajizadehh@mums.ac.ir
authors: Hila
authors: H
authors: Hajizadeh
authors: Marjaneh
authors: M
authors: Ghavamnasiri
authors: Mohammad Sadegh
authors: MS
authors: Namazikhah
authors: Sara
authors: S
authors: Majidinia
authors: Mahshid
authors: M
authors: Bagheri
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D001840:Dental Bonding / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third; D010756:Phosphoric Acids / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*; D033081:Shear Strength; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000737:chemistry; D018709:Statistics, Nonparametric; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; D012117:Resins, Synthetic; C006903:carbopol 940; D012973:Sodium Hypochlorite; C030242:phosphoric acid