An improved dental composite with potent antibacterial function

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Dental composites are widely used for restorations.
• Developing antibacterial dental materials is crucial to prevent secondary infections.
• Bisphenol A glycidyl methacrylate (BisGMA) is a common resin matrix in dental composites.

Purpose of the Study:

• To formulate and evaluate a new BisGMA-based antibacterial dental composite.
• To assess the impact of bromine and chlorine-containing derivatives on composite properties.
• To investigate the antibacterial efficacy and mechanical performance of the modified composites.

Main Methods:

• Formulation of BisGMA-based dental composites with halogen-containing derivatives.
• Evaluation of mechanical properties including compressive strength, compressive modulus, diametral tensile strength, and flexural strength.
• Assessment of antibacterial activity through bacterial viability tests.
• Measurement of physical properties such as water sorption and shrinkage.
• Determination of the degree of conversion.

Main Results:

• The modified composites exhibited significantly enhanced antibacterial function.
• Bromine-containing derivative-modified composite showed higher antibacterial activity than the chlorine-containing composite.
• Mechanical properties improved, with increases in compressive yield strength (30-53%), compressive modulus (15-30%), diametral tensile strength (15-33%), and flexural strength (6-20%).
• Bacterial viability decreased by 57-76%, water sorption by 23-37%, and shrinkage by 8-15%.
• Degree of conversion remained similar to the unmodified composite.

Conclusions:

• The developed BisGMA-based composite demonstrates potent antibacterial activity and improved mechanical properties.
• Halogen modification, particularly with bromine, enhances antibacterial efficacy.
• This experimental composite shows promise as an attractive dental restorative material.