Crosslinked Antibacterial Polymer Particles for Durable Dental Fillers

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Solution Overview

Problem

Existing antibacterial agents in dental compositions suffer from insufficient antibacterial activity and durability.

Innovation Solution

Antibacterial polymer particles comprising a crosslinked copolymer with structural units derived from both monofunctional and polyfunctional monomers, ensuring a water absorption capacity of 3 g/g or more, which enhances both antibacterial activity and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a polymer is obtained by polymerizing polymerizable monomers including at least one antibacterial polymerizable monomer, then antibacterial activity is imparted to the filler surface, but the antibacterial activity and durability are insufficient

Engineering Contradiction:

Improveantibacterial activityVSAvoiddurability of antibacterial activity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention uses a composite polymer structure combining monofunctional monomers (providing antibacterial groups) with polyfunctional monomers (providing crosslinking capability). This composite approach creates a crosslinked copolymer that integrates both antibacterial functionality and structural stability, resolving the contradiction between achieving antibacterial activity and maintaining its durability over time

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the chemical structure parameters of the polymer by controlling the ratio and types of monomers used. By adjusting the composition to include specific proportions of monofunctional and polyfunctional monomers, and by controlling polymerization conditions, the invention optimizes both the antibacterial group content and crosslinking density to achieve high antibacterial activity and durability simultaneously

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If only polyfunctional monomer with antibacterial group is used, then crosslinked structure is formed, but antibacterial activity is reduced due to confinement of antibacterial group

Engineering Contradiction:

Improvecrosslinked structure stabilityVSAvoidantibacterial activity

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention segments the monomer functions into two distinct types: monofunctional monomers that provide antibacterial groups and polyfunctional monomers that provide crosslinking sites. This segmentation allows each monomer type to optimize its specific function without interference, enabling high antibacterial activity while maintaining crosslinked structure stability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention applies local quality by concentrating antibacterial groups from monofunctional monomers at specific locations within the crosslinked polymer network, while using polyfunctional monomers to create the crosslinking framework. This localized distribution ensures antibacterial groups are accessible and active while the overall structure remains stable

Inventive Principle:

Principle #3Local quality

3Reliability

If only monofunctional monomer with antibacterial group is used, then antibacterial activity is maintained, but durability of antibacterial activity is reduced due to non-crosslinked copolymer structure

Engineering Contradiction:

Improveantibacterial activityVSAvoiddurability of antibacterial activity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention merges the benefits of monofunctional monomers (antibacterial activity) with polyfunctional monomers (crosslinking capability) into a single copolymer structure. This combination allows the polymer to simultaneously maintain high antibacterial activity through monofunctional units while achieving durability through the crosslinked network formed by polyfunctional units

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The antibacterial polymer particles provide high antibacterial activity and durability, improving the performance of dental compositions by maintaining effective antibacterial properties over time.

Implementation Method 1

a water absorption capacity of the antibacterial polymer particles is 3 g/g or more

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS12497476B2Antibacterial polymer particles, composition, and article

Publication Date: 2025.12.16 GC CORP

AI summary

One aspect of the present invention includes, in antibacterial polymer particles, a crosslinked copolymer having a structural unit derived from a monofunctional monomer having an antibacterial group, and a structural unit derived from a polyfunctional monomer. A water absorption capacity of the antibacterial polymer particles is 3 g/g or more.