Nanohybrid hydrogels designed for transbuccal anesthesia

Area of Science:

• Pharmaceutical Sciences
• Biomaterials Engineering
• Nanotechnology

Background:

• Dental local anesthesia is often associated with patient fear and pain, leading to treatment interruptions.
• Existing topical anesthetic formulations lack sufficient efficacy in managing needle-insertion pain and phobia.

Purpose of the Study:

• To develop and characterize a nanostructured lipid-biopolymer hydrogel for sustained transbuccal delivery of lidocaine-prilocaine (LDC-PLC).
• To evaluate the stability, safety, and efficacy of the novel hydrogel formulation for pre-anesthesia in dentistry.

Main Methods:

• Prepared nanostructured lipid carriers (NLC) loaded with LDC-PLC and formulated a hybrid hydrogel with xanthan (XAN).
• Assessed hydrogel properties including rheology, stability (6 months accelerated conditions), and drug content.
• Evaluated in vitro drug release kinetics, structural characteristics (FTIR, DSC, SEM), cell viability, and in vivo antinociceptive effects.

Main Results:

• The XAN-NLC hydrogel exhibited suitable rheological properties for topical application and demonstrated good stability.
• In vitro studies showed sustained LDC-PLC release over 24 hours with synergistic interactions between components.
• In vivo tests revealed that the XAN-NLC/LDC-PLC hydrogel significantly enhanced anesthetic duration and potency compared to controls.

Conclusions:

• The developed nanohybrid hydrogel system offers a promising approach for effective transbuccal pre-anesthesia.
• The formulation demonstrates superior anesthetic properties and is ready for further clinical investigation.