Dentine Tubule Occlusion by Novel Bioactive Glass-Based Toothpastes

Area of Science:

• Biomaterials science
• Dental materials research
• Nanotechnology in dentistry

Background:

• Dentine hypersensitivity (DH) is a common condition with various treatment options.
• Bioactive glasses are emerging as a potential therapeutic agent in toothpaste formulations for DH management.

Purpose of the Study:

• To compare the efficacy of different bioactive glass formulations in managing dentine hypersensitivity using an in vitro model.
• To evaluate the potential of bioactive glasses in occluding dentine tubules.

Main Methods:

• Synthesis and formulation of five different bioactive glass toothpastes, including 45S5 and amorphous chloride glass.
• Preparation of human dentine discs, removal of smear layer with citric acid, and application of toothpaste formulations.
• Assessment of dentine samples using scanning electron microscopy (SEM) after immersion in artificial saliva or acid challenge.

Main Results:

• SEM analysis revealed good surface coverage of bioactive glasses after artificial saliva immersion.
• Acid challenge removed hydroxyapatite layers on most samples, but amorphous chloride glass demonstrated significant tubular occlusion.
• Evidence of dentine tubule occlusion was observed across several bioactive glass formulations.

Conclusions:

• Bioactive glass inclusion in toothpaste formulations shows potential for effective treatment of dentine hypersensitivity.
• Amorphous chloride glass formulation exhibited notable resistance to acid challenges, suggesting superior protective qualities.
• Further research into bioactive glass formulations could lead to improved therapies for DH.