Self-Etching Dental Material via Bisphosphonic Acid Monomers
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Solution Overview
Problem
Existing dental materials require multiple steps and pretreatments for effective adhesion to hard tooth structures like enamel, and they often fail to achieve strong adhesion to inorganic materials such as oxide ceramics and metals.
Innovation Solution
A dental material containing radically polymerizable monomers with specific structures, including N-substituted (meth)acrylamido-bisphosphonic acids, which can be used in one step without pretreatment, providing strong adhesion to enamel and other materials through self-etching properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple steps and pretreatments (etching agents, primers) are used to achieve adhesion to hard tooth structures, then adhesion strength can be improved, but the complexity of the procedure and time consumption increase
Solution Approach 1:
The patent combines multiple functional components (radically polymerizable monomers with phosphonic acid groups, acrylate/methacrylate monomers, and initiators) into a single dental material composition that performs both etching and bonding functions simultaneously, eliminating the need for separate etching and priming steps while maintaining strong adhesion to enamel and dentin
Solution Approach 2:
The dental material is designed with multi-functional monomers that can interact with both enamel (via phosphonic acid groups) and polymerize to form strong bonds, allowing a single material to replace multiple specialized materials (etching agent, primer, and adhesive) traditionally required in separate steps
2Ease of manufacture
If traditional dental materials are used without self-etching properties, then the material composition can be simpler, but separate primers and etching agents are required
Solution Approach 1:
The patent merges etching functionality (via phosphonic acid groups that chemically interact with calcium in tooth structure) and bonding functionality (via polymerizable acrylate/methacrylate groups) into a single composition, eliminating the need for sequential application of separate etching and priming materials
3Ease of manufacture
If N-substituted (meth)acrylamido-bisphosphonic acids with short spacer chains are used, then the molecular structure is simpler, but adhesion strength on enamel is reduced
Solution Approach 1:
The patent systematically varies the spacer chain length (A in formula I) between the N-substituted (meth)acrylamido group and the bisphosphonic acid group, discovering that specific chain lengths (particularly C6-C18 alkylene or C8-C18 alkylarylene) optimize both the molecular flexibility for bonding and the spatial arrangement for strong enamel adhesion
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 material achieves high adhesive strength on enamel and other inorganic materials without the need for separate primers or etching agents, enhancing the efficiency and simplicity of dental procedures.
Implementation Method 1
c. at least one initiator for the radical polymerization
Data Source
AI summary
The invention relates to a dental material which contains: a) radically polymerizable monomers according to formula (I) having: R1 = methyl or H; R2 = alkyl, aryl, or arylalkyl; R3 = H, alkyl or OR4; R4 = H or alkyl; A = C6-C18 alkylene or C8-C18 alkylarylene; b) radically polymerizable monomers containing at least one acrylate and/or methyl acrylate group; c) at least one initiator for the radical polymerization.