title: Contemporary adhesives: marginal adaptation and microtensile bond strength of class II composite restorations.
abstract: OBJECTIVE
  To evaluate the marginal adaptation (in terms of % continuous margin) and microtensile bond strength (microTBS) of the enamel and dentin of direct class II composite restorations.
  
  
  METHODS
  32 standardized class II cavities were prepared with the gingival margin of one box occlusal to the cementum-enamel junction (CEJ) and one gingival floor extended beyond the CEJ. The teeth (n= 8) were restored using one of four adhesive systems [Adper Scotchbond Multi Purpose (SMPP), Adper Scotchbond 1 XT (S1XT), Clearfil SE Bond (CSEB), or Clearfil Tri-S Bond (CTSB)] with incrementally placed composite restorations before being stored in water (24 hours), thermocycled (2,000 cycles, 5 to 55 degrees C) and mechanically loaded (50,000 cycles, 50 N). Marginal adaptation was evaluated by SEM. Additionally, the teeth were sectioned and trimmed to obtain specimens for microTBS testing.
  
  
  RESULTS
  All adhesive systems exhibited "continuous margins" in enamel over 95.4%, whereas "continuous margins" in dentin ranged from 60.2 to 84.8%. CSEB and CTSB yielded significantly more "continuous margins" between the adhesive restoration and dentin than SMPP or S1XT (P< 0.05). The mean microTBSs (MPa) for enamel were 40.5 (SMPP), 37.3 (S1XT), 30.8 (CSEB) and 23.2 (CTSB), and for dentin, they were 37.7 (SMPP), 33.0 (S1XT), 37.3 (CSEB) and 29.0 (CTSB).
authors.affiliation: Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan. renatakahashi@hotmail.com
authors.forename: Rena
authors.initials: R
authors.lastname: Takahashi
authors.forename: Toru
authors.initials: T
authors.lastname: Nikaido
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
authors.forename: Reinhard
authors.initials: R
authors.lastname: Hickel
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Kunzelmann
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D003188:Composite Resins; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D012044:Regression Analysis; D019279:Resin Cements; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D019279:Resin Cements