title: Micro-tensile bond strength of sound and caries-affected primary tooth dentin measured with original designed jig.
abstract: To measure the micro-tensile bond strength (MTBS) on sound and caries-affected primary tooth dentin using an original designed jig that was developed for making symmetric and uniformly-sized specimens for the micro-tensile strength testing. The MTBS of dumbbell-shaped specimens and matchstick-shaped specimens were measured. Dumbbell-shaped specimens: The occlusal surfaces of 15 sound primary molars were ground with a water-cooled air turbine using a diamond bur. The adhesive systems and resin-based composites were Clearfil SE Bond and Clearfil AP-X (SE group) and Single Bond and Z250 (SB group). Matchstick-shaped specimens: Sixteen primary molars (5 sound and 11 carious) were used. The occlusal surfaces of sound teeth were ground with a water-cooled air turbine using a diamond bur. Infected dentin was determined by a caries detecting dye solution and removed with a round-shaped steel bur under water-cooling and with a hand instrument. SE was applied. Data was statistically analyzed using ANOVA and Fisher's PLSD at p < 0.05. The MTBSs (MPa) for the dumbbell-shaped specimens were 8.9 +/- 7.0 in the SE group and 10.3 +/- 5.8 in the SB group and that for the matchstick-shaped specimens were 9.0 +/- 6.3 in the sound-SE group and 9.2 +/- 5.8 in the carious-SE group. No significant difference was observed among them.
authors.affiliation: Division of Pediatric Dentistry, Course of Medical and Dental Sciences, Department of Developmental and Reconstructive Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. hosoya@net.nagasaki-u.ac.jp
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Hosoya
authors.forename: Eiji
authors.initials: E
authors.lastname: Kawada
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Ushigome
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oda
authors.forename: Franklin
authors.initials: F
authors.lastname: Garcia-Godoy
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003731:Dental Caries; D003737:Dental Cavity Preparation; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D019279:Resin Cements; D013718:Tensile Strength; D014094:Tooth, Deciduous
chemical_list: C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate