Aqueous Zinc-Fluoride Oral Care Composition Without Precipitation
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Solution Overview
Problem
Existing zinc and fluoride compositions are not stable in aqueous solutions and tend to precipitate, and silver-based treatments cause tooth staining, limiting their effectiveness in preventing and treating dental caries.
Innovation Solution
Aqueous dental compositions stabilized with zinc carboxylates and amine-containing ligands, combined with fluoride ions, are formulated to maintain solubility and stability, with a pH of at least 8, to treat and prevent caries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc fluoride or zinc complexes are used in aqueous solutions, then antimicrobial and remineralizing properties are provided, but the compositions precipitate and become unstable
Solution Approach 1:
The patent uses carboxylate ligands (such as gluconate, citrate, or malate) as intermediary molecules that coordinate with zinc ions to form stable, water-soluble complexes. These ligands act as mediators between the zinc fluoride source and the aqueous solution, preventing precipitation while maintaining the antimicrobial and remineralizing properties. The carboxylate groups bind to zinc ions, creating stable chelate complexes that remain dissolved in water.
Solution Approach 2:
The patent changes the chemical parameters of the zinc compound by using zinc salts of weak acids (carboxylic acids) instead of zinc fluoride directly. This parameter change in the anion type (from fluoride to carboxylate) fundamentally alters the solubility and stability characteristics, allowing the zinc to remain in solution while still providing the desired dental benefits when fluoride is released.
2Reliability
If silver diamine fluoride is used to treat caries, then antibacterial properties are provided, but silver phosphate forms and stains teeth black
Solution Approach 1:
The patent extracts the staining component (silver) from the treatment composition while retaining the antibacterial and remineralizing functions. By replacing silver with zinc and using carboxylate ligands, the composition eliminates the light-sensitive silver phosphate formation that causes black stains, while maintaining therapeutic efficacy through zinc's antibacterial properties and fluoride's remineralizing action.
Solution Approach 2:
The patent replaces the expensive and problematic silver-based system with a more affordable zinc-based system that does not have the light sensitivity issue. Zinc complexes provide comparable or superior stability and do not require the same level of protection from light exposure, making them a more practical and cost-effective alternative.
3Quantity of substance
If high concentration of fluoride is provided (at least 4 wt %), then remineralizing properties are enhanced, but the composition becomes less stable and more prone to precipitation
Solution Approach 1:
The carboxylate ligands serve as intermediaries that stabilize high concentrations of fluoride in the aqueous solution. By coordinating with zinc ions, the ligands create a molecular structure that can accommodate high fluoride content without precipitation, effectively mediating between the high fluoride concentration requirement and the stability requirement.
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 compositions effectively prevent and treat dental caries by maintaining solubility, providing antimicrobial and remineralizing properties without staining, as demonstrated by increased micro-hardness and fluoride uptake in tooth enamel.
Implementation Method 1
a zinc complex stabilized with amine-containing ligands in an aqueous solution
Implementation Method 2
fluoride salts are known to remineralize tooth surfaces
Implementation Method 3
Zinc salts are also known to have antibacterial properties
Data Source
AI summary
A dental composition is described that includes a homogenous solution having a stabilized zinc complex with amine-containing ligands and a source of fluoride anions. Also described are methods for treating or preventing caries activity at a tooth surface employing the dental composition, and kits re the same.