Self-Etching Dental Primer Composition for Enamel and Dentin Adhesion
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Solution Overview
Problem
Current dental adhesive primer compositions face challenges in achieving strong and durable adhesion to both enamel and dentin, with insufficient adhesion to dentin and poor storage stability due to hydrolysis in acidic environments, leading to complex application processes and reduced durability.
Innovation Solution
A dental adhesive primer composition combining a phosphonic acid group-containing polymerizable monomer with a polyhydric carboxylic acid group-containing polymerizable monomer, along with a water-soluble organic solvent and a polymerization catalyst, which enhances adhesion to both enamel and dentin while maintaining stability under acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phosphoric acid etching material is used to treat tooth surfaces, then adhesion to enamel is improved through formation of roughened surface, but the operation steps become complicated requiring sufficient washing and drying
Solution Approach 1:
The patent combines the etching function and primer function into a single self-etching primer composition. The composition contains both acidic components (for etching enamel and dentin) and polymerizable monomer components (for primer action), eliminating the need for separate etching and priming steps while achieving roughened surface formation and adhesive bonding simultaneously
Solution Approach 2:
The self-etching primer performs the etching action preliminarily during its application phase. The acidic components in the composition etch the tooth surface as the primer is applied, preparing the surface for bonding without requiring a separate preliminary etching step, thus simplifying the overall operation
2Strength
If acid etching material is used to decalcify tooth surface, then roughened surface is formed for mechanical fitting, but spongy collagen fiber is exposed on dentin making sufficient penetration and adhesion difficult
Solution Approach 1:
The self-etching primer composition has different components that act locally on different tooth structures. The acidic components selectively etch enamel and dentin surfaces, while the polymerizable monomers penetrate and bond to the exposed collagen fibers in dentin. This local differentiation of function within a single composition allows simultaneous achievement of mechanical fitting on enamel and chemical bonding on dentin
Solution Approach 2:
The self-etching primer is a composite material containing both acidic etching agents and polymerizable monomers in specific proportions. This composite structure allows the composition to perform multiple functions: etching the mineralized surface and simultaneously penetrating and bonding to the organic collagen matrix, resolving the contradiction between mechanical fitting and chemical adhesion
3Strength
If conventional primer compositions are used to achieve adhesion to dentin, then some adhesion is obtained, but storage stability deteriorates due to hydrolysis in acidic environment
Solution Approach 1:
The patent modifies the chemical parameters of the primer composition by using specific polymerizable monomers with appropriate functional groups and molecular structures that are resistant to hydrolysis in acidic environments. The composition maintains optimal acidity for etching while selecting monomers that do not undergo hydrolytic degradation, thus improving storage stability without sacrificing adhesion performance
Solution Approach 2:
The self-etching primer is designed as a stable, long-lasting composition that does not require immediate use like disposable materials. The improved resistance to hydrolysis allows the primer to be stored for extended periods while maintaining its adhesive properties, eliminating the need for frequent replacement due to degradation
4Adaptability or versatility
If acid tooth surface treating materials are used to replace phosphoric acid, then different chemical approaches are provided, but sufficient adhesion to dentin is still difficult to obtain
Solution Approach 1:
The self-etching primer composition is designed to be universally effective on both enamel and dentin with a single formulation. It contains acidic components that can etch various tooth structures and polymerizable monomers that can bond to both inorganic enamel and organic dentin, providing multi-functional adhesion without requiring different materials for different tooth types
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 composition achieves strong and durable adhesion to both enamel and dentin, with improved storage stability and resistance to hydrolysis, allowing for a simplified one-pack packaging form and effective performance in severe intraoral environments.
Implementation Method 1
the phosphonic acid group is chemically bonded with a calcium component of the dental substance
Implementation Method 2
containing a photopolymerization catalyst or a chemical polymerization catalyst
Implementation Method 3
containing a photopolymerization catalyst or a chemical polymerization catalyst
Implementation Method 4
the acid applied on the tooth surface must be sufficiently removed by washing with water and the tooth surface dried
Implementation Method 5
the bonding material is applied to bond tooth substances with a composite resin
Data Source
AI summary
The present invention relates to a dental adhesive primer composition for use in dental fields employed to bond dental materials, such as restoration materials, dental crown materials, prosthetic materials, esthetic materials, orthodontic materials, preventive materials, core build-up materials and root canal materials, to ceramics, metals, resins, composite resins, glass ionomer cements, and hard biotissues (enamel or dentin of natural tooth). The present invention also relates to a dental adhesive primer composition including a dental adhesive composition which can be used not only in combination with another adhesive composition but also alone.