Siloxane Compositions for Dental Adhesion Durability
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Solution Overview
Problem
Current dental and industrial adhesive materials face challenges in achieving optimal adhesion and durability due to limitations in the synergy between organic polymer matrices and fillers, particularly in the hydrolysis and polymerization processes, which affect the performance and service life of glass or ceramic filled polymeric composites.
Innovation Solution
Development of compositions comprising specific compounds with silane functionality and antimicrobial properties, which can replace or enhance existing silane and acrylate chemistries, incorporating quaternary ammonium silanes that improve adhesion and curing characteristics by forming strong interfacial bonds with fillers and resin phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If traditional silane and acrylate chemistries are used for bonding, then adhesion is achieved, but service life and durability are limited due to insufficient synergy between organic polymer matrix and fillers
Solution Approach 1:
The patent employs silane coupling agents as interfacial phases that create a composite structure between inorganic fillers (glass or ceramic) and organic polymer matrices. The silane forms a bridging layer that chemically bonds to both the filler surface and the polymer resin, creating a true composite material system rather than a simple mixture, thereby enhancing both durability and adhesion reliability
Solution Approach 2:
The silane coupling agent acts as an intermediary substance that mediates the interface between the inorganic filler and organic polymer. It contains both inorganic-compatible groups (for bonding to filler surfaces) and organic-compatible groups (for graft copolymerization with resin), serving as a molecular bridge that enables synergistic interaction between the two phases
2Strength
If silane coupling agents are used to form interfacial bonds, then adhesion between filler and resin is improved, but the chemistry becomes complex involving hydrolysis, self-condensation, and exchange reactions
Solution Approach 1:
The silane coupling agent is pre-applied to the filler surface before polymerization, allowing it to hydrolyze and self-condense form a stable siloxane network on the filler surface in advance. This preliminary action creates a ready-to-bond interface that simplifies the subsequent polymerization step, as the silane is already in its reactive silanol form positioned for optimal bonding
3Reliability
If multiphase composite materials are used with interfaces and interphases, then performance is enhanced through filler-resin synergy, but manufacturing and processing become more difficult
Solution Approach 1:
The patent controls the molecular weight and functionality of the silane coupling agent to optimize the balance between interfacial bond strength and processing ease. By adjusting parameters such as the number of reactive groups per silane molecule and the length of alkyl chains, the material achieves strong adhesion while maintaining workable viscosity and cure characteristics for practical application
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 new compositions demonstrate enhanced adhesion, improved curing efficiency, and antimicrobial properties, leading to improved performance and extended service life of dental and industrial composite materials, with potential applications in dental bonding agents, medical adhesives, and industrial coatings.
Implementation Method 1
upon hydrolysis of the alkoxy groups of the silane to form silanols and —Si—O—Si— bonds to filler surfaces
Implementation Method 2
hydrolytically initiated self-condensation reactions with or without solvents that culminate in polymeric silsesquioxane structures
Implementation Method 3
also with the resin phase by graft copolymerization via the functional group, usually a methacrylic or vinyl group
Implementation Method 4
Ra is independently a functional group comprising at least one curing group selected from the group consisting of acrylate, methacrylate
Data Source
AI summary
Compositions are disclosed that comprise at least one compound of formula IV:wherein the variable are as defined in the specification. The compositions are antimicrobial and optionally curable, and useful, inter alia, in dental, medical, and industrial applications for reinforcement and/or adhering two surfaces together.