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Composite Alginate-Hyaluronan Sponges for the Delivery of Tranexamic Acid in Postextractive Alveolar Wounds.
Journal of Pharmaceutical Sciences 2018 Februrary
The management of wounds in patients on anticoagulant therapy who require oral surgical procedures is problematic and often results in a nonsatisfactory healing process. Here, we report a method to prepare an advanced dressing able to avoid uncontrolled bleeding by occluding the postextractive alveolar wounds, and simultaneously, capable of a fast release of tranexamic acid (TA). Composite alginate/hyaluronan (ALG/HA) sponge dressings loaded with TA were prepared by a straightforward internal gelation method followed by a freeze-drying step. Both blank and drug-loaded sponges were soft, flexible, and elegant in appearance and nonbrittle in nature. Scanning electron microscopy analysis confirmed the porous nature of these dressings. The integration of HA influenced the microstructure, reducing the porosity, modifying the water uptake kinetic, and increasing the resistance to compression. TA release from ALG/HA sponges showed a controlled release up to 3 h, and it was faster in the presence of HA. Finally, an in vitro clotting test performed on human whole blood confirmed that the TA-loaded sponges significantly reduce the blood clotting index by 30% compared with ALG/HA20 sponges. These results suggest that, if placed in a socket cavity, these dressings could give a relevant help to the blood hemostasis after dental extractions, especially in patients with coagulation disorders.
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