Degradation of resin–dentine bond of different adhesive systems to primary and permanent dentine
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Abstract
Aim
To evaluate the water storage degradation of resin–dentine bonds of different adhesive systems to primary and permanent human dentine.
Methods
Flat occlusal human dentine surfaces of 15 primary molars and 15 permanent molars were randomly assigned according to adhesive systems: Adper Single Bond 2; Clearfil SE Bond and One Up Bond F Plus. After bonding procedures, the adhesives were applied according to the manufacturers’ instructions and composite resin blocks were built. Restored teeth were sectioned rendering rectangular sticks (RS) (0.4 mm2). The RS were submitted to microtensile bond strength (µTBS) test according to the water storage time: 24 h, 1-year, and 2-years. Mean µTBS values were analysed by three-way analysis of variance (mixed design) and Tukey post hoc test (α = 0.05). The failure mode was analysed at 400× magnification.
Results
All three factors isolated showed significant influences on µTBS, as did the cross-product interactions between material vs. storage time (p = 0.01) and substrate vs. storage time (p = 0.002). Bond strength means to primary dentine were lower than to permanent dentine (34.7 ± 10.1 and 45.8 ± 12.9 mPa, respectively) after 2-years of water storage. The one-step self-etch adhesive (One Up Bond F Plus) showed less stable bond strength after 2-years of water storage.
Conclusion
The resin–dentine bond of primary teeth was more prone to degradation over time compared to permanent dentine.
Keywords
Bond strength Dentine Permanent teeth Primary teethNotes
Compliance with ethical standards
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study protocol was previously approved by the Local Ethics Committee, Universidade Federal de Santa Maria, CAAE 367657 14.3.0000.5346
This study has no funding.
All authors declare that they have no conflict of interest.
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