Dental Curable Composition Refractive Index Contrast
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Solution Overview
Problem
Current dental restorative materials face challenges in achieving strong self-adhesion to tooth tissues without pre-treatment, maintaining high physical properties, and providing good aesthetics, particularly in terms of color tone adaptability and transparency.
Innovation Solution
A dental curable composition comprising two types of inorganic particles with specific refractive indices and average grain sizes, combined with a polymerizable monomer and polymerization catalyst, which allows for self-adhesion to enamel and dentin, simplifying the restorative procedure and enhancing color tone adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin-based filling/restoring material is used, then aesthetic restoration and high physical properties are achieved, but self-adhesion to tooth tissues is poor requiring complex pre-treatment
Solution Approach 1:
The patent combines the resin-based material matrix with inorganic particles that possess both aesthetic properties (transparency, color tone) and adhesive functionality (acidic groups). This merging allows the material to simultaneously achieve high physical properties from the resin matrix and self-adhesion to tooth tissues through the acidic groups on inorganic particle surfaces, eliminating the need for separate adhesive systems.
Solution Approach 2:
The invention creates a composite material system consisting of a polymerizable monomer matrix containing inorganic particles with specific properties (acidic groups, controlled refractive index). This composite structure enables the material to exhibit both the mechanical strength and aesthetics of resin-based materials and the adhesion capability of glass ionomer cements, resolving the contradiction between physical properties and self-adhesion.
2Ease of operation
If glass ionomer cement is used, then self-adhesion to tooth substance is achieved, but physical properties and aesthetics are low
Solution Approach 1:
The patent develops a composite material that integrates the advantages of both resin-based materials and glass ionomer cements. The polymerizable monomer matrix provides high physical properties and aesthetics similar to resin-based materials, while the inorganic particles with acidic groups on their surfaces provide self-adhesion to tooth substance, matching the adhesive capability of glass ionomer cements.
Solution Approach 2:
The invention modifies the chemical composition and surface properties of inorganic particles by incorporating acidic groups and controlling refractive index parameters. These parameter changes enable the material to achieve both self-adhesion (through acidic group interaction with tooth substance) and high physical properties (through optimized refractive index matching and polymerizable matrix), overcoming the limitations of conventional glass ionomer cements.
3Adaptability or versatility
If multiple inorganic particles with different refractive indexes are used, then color tone adaptability is improved, but material complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific refractive index ranges to different inorganic particles (first particles: 1.45-1.55, second particles: 1.60-1.70) to create distinct optical functions. This localized optimization of refractive index properties in different particle populations enables precise control over color tone adaptability and transparency while maintaining manageable material composition through defined particle categories.
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 self-adhesion to biological hard tissues, reduces procedural time and errors, and offers moderate color tone adaptability, ensuring aesthetic restoration with improved mechanical strength and transparency.
Implementation Method 1
the refractive index na of the inorganic particle (A) and the refractive index nb of the inorganic particle (B) meet the relationship of na>nb... the color tone and the transparency of the resin-based filling/restoring material are controlled by adjusting the amount of an additive such as a pigment... using an opalescent filler
Implementation Method 2
the cavity is filled with the resin-based filling/restoring material and the resin-based filling/restoring material is cured by one step of visible light irradiation
Implementation Method 3
a polymerizable monomer (C)... a polymerizable monomer having an acidic group is used... the material is self-adhesive to the tooth substance
Data Source
AI summary
A single-paste, self-adhesive dental curable composition that has strong self-adhesion to biological hard tissues (such as enamel and dentin of teeth) and good color tone adaptability suitable for use for aesthetic restoration is provided. A dental curable composition contains: an inorganic particle (A) with an average grain size in the range of 0.1 to 50 µm; an inorganic particle (B) with an average grain size in the range of 0.1 to 50 µm; a polymerizable monomer (C); and a polymerization catalyst (D). The refractive index na of the inorganic particle (A) and the refractive index nb of the inorganic particle (B) meet the relationship of na > nb. A cured resin material (E), which is obtained by curing a polymerizable composition containing the polymerizable monomer (C) and the polymerization catalyst (D), has a refractive index ne that meets the relationship (1): 0≤na-ne<0.01≤ne-nb≤0.05