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Contemporary adhesives: marginal adaptation and microtensile bond strength of class II composite restorations.
Am J Dent. 2012 Jun;25(3):181-8
Authors: Takahashi R, Nikaido T, Tagami J, Hickel R, Kunzelmann KH
Abstract
PURPOSE: 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).
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