Percorrer por autor "Tirot, Corentin Marie Jacques"
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- Extrafibrillar demineralization on the dentin bond strength of self-adhesive compositesPublication . Tirot, Corentin Marie Jacques; Delgado, António SalesObjectives: To determine whether the application of an extrafibrillar demineralization technique in sound dentin improves the bond strength of commercial self-adhesive flowable resin composites (SAFRCs), both immediately (at 24 h) and after 10 000 cycles of thermocycling. Materials and Methods: Sixty sound human molars were collected, disinfected, and stored in distilled water until use. Flat mid-coronal dentin surfaces were prepared and the teeth were randomly assigned to 12 experimental groups (n=5) according to the composite (Vertise Flow or Constic), conditioning protocol (glycol chitosan methacrylate, PAMAM, or phosphoric acid), and application time (30 s or 60 s). Composite build-ups were incrementally placed and light-cured. After 24 h in distilled water, specimens were sectioned into sticks and tested for μTBS either immediately or after 10,000 thermocycles (5 °C/55 °C). Failure modes were examined under a stereomicroscope. Data were analyzed by three-way ANOVA followed by post-hoc comparisons (³=0.05). Results: Extrafibrillar demineralization with glycol chitosan methacrylate or PAMAM did not increase μTBS compared with the phosphoric acid control. Vertise Flow consistently achieved higher values than Constic (p<0.001). All groups exhibited significant bond strength reduction after thermocycling (p<0.001). PAMAM produced negligible adhesion under all conditions. Conclusion: Within the limitations of this in vitro study, selective extrafibrillar demineralization does not enhance the bonding effectiveness of self-adhesive flowable resin composites. Bond performance was mainly influenced by material composition, with Vertise Flow performing significantly better than Constic. Although biologically attractive, the use of these selective agents appears insufficient to overcome the intrinsic limitations of current selfadhesive formulations.