title: Long-term tensile bond durability of two different 4-META containing resin cements to dentin.
abstract: OBJECTIVE
  This study was conducted to evaluate the tensile bond durability of two different types of 4-META containing resin cements over a period of 3 years.
  
  
  METHODS
  Ten bovine dentin specimens were tested for tensile bond strengths with each of the following materials: Super Bond C&B: unfilled methyl methacrylate (MMA)/polymethyl methacrylate (PMMA) resin cement, MASA Bond (experimental material): filled dimethacrylate resin cement at 1 day, 6 months, 1 and 3 years. The mean bond strengths were compared statistically by two-way ANOVA and Fisher's PLSD test (P<0.05). The mode of failure was classified by SEM observation. Results for the mode of fracture were analyzed using the Mann-Whitney U test.
  
  
  RESULTS
  Although there was no statistical difference in mean bond strength between Super Bond C&B and MASA Bond (P>0.05) during the experimental periods, the 1-day bond strengths were significantly greater than those at the other experimental periods except for 6 months (P<0.05). Regarding the fracture modes, at 6 months and 1 year, statistical differences were observed between Super Bond C&B and MASA Bond (P<0.05).
  
  
  CONCLUSIONS
  The bond strengths of both resin cements to dentin significantly decreased after 6 months, and the long-term failure patterns of the 4-META/TBB resin cements showed a marked change.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 5-45 Yushima 1-chome, Bunkyo-ku, Tokyo 113-8549, Japan. y.kitasako.odont@dent.tmd.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Kitasako
authors.forename: M F
authors.initials: MF
authors.lastname: Burrow
authors.forename: T
authors.initials: T
authors.lastname: Nikaido
authors.forename: J
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000636:Aminosalicylic Acids / Q000737:chemistry; D000704:Analysis of Variance; D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D002070:Butadienes / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D020366:Methylmethacrylate / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000636:Aminosalicylic Acids; D001896:Boron Compounds; D002070:Butadienes; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D011137:Polystyrenes; D019279:Resin Cements; C101915:styrene-butadiene-styrene triblock copolymer; C009523:tri-n-butylborane; D020366:Methylmethacrylate; C074497:N-methacryloyl-5-aminosalicylic acid; C034139:4-methacryloxyethyltrimellitic acid anhydride; D019904:Polymethyl Methacrylate; C049495:Super-bond