Silver Complex Fluoride for Non-Staining Dental Caries Arrest
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Solution Overview
Problem
Existing silver diamine fluoride (SDF) solutions used for treating dental caries cause permanent staining of teeth and gums due to the formation of 'black' silver compounds, while water-soluble metal phosphine complexes have not been explored for their anticaries potential.
Innovation Solution
A silver complex fluoride (SCF) is developed, where a silver cation is complexed by water-soluble phosphine ligands and a fluoride anion, ensuring the compound is stable and non-staining, with the SCF being formulated as an active ingredient in a therapeutic agent for dental caries management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional silver diamine fluoride (SDF) solutions are used to treat dental caries, then carious lesions are arrested and antimicrobial activity is achieved, but permanent black staining of teeth and gums occurs
Solution Approach 1:
The patent introduces water-soluble phosphine ligands (such as PTA, PPh3, or tris) as intermediary molecules that complex with silver ions to form stable, non-staining silver complex fluoride compounds. These ligands act as mediators between the silver ion's antimicrobial function and the requirement for cosmetic acceptability, preventing the formation of black silver compounds while maintaining therapeutic efficacy
Solution Approach 2:
The patent changes the chemical parameters of the silver compound by forming coordination complexes with phosphine ligands. This transforms the silver ion from a free or diamine-complexed state (which forms black precipitates) to a phosphine-complexed state (which remains stable and non-staining), thereby altering the chemical properties to eliminate the harmful staining effect while preserving caries arrest capability
2Reliability
If water-soluble metal phosphine complexes are used, then antimicrobial and antitumor activity is achieved, but their application as anticaries agents has not been demonstrated
Solution Approach 1:
The patent extends the application scope of water-soluble phosphine complexed metal fluorides from their previously demonstrated antitumor and antimicrobial uses to include dental caries management. By formulating these complexes specifically for oral application and demonstrating their dual capability for remineralization and caries arrest, the invention makes this class of compounds universally applicable across multiple therapeutic areas including oncology, infectious disease, and dentistry
3Productivity
If concentrated SDF solutions are used to stop caries, then carious lesions are effectively arrested, but pronounced discoloration of teeth and gums results
Solution Approach 1:
The patent converts the potential harm of silver compound staining into a benefit by using the same silver ion's antimicrobial properties while eliminating its staining side effect. The phosphine ligands selectively prevent the formation of black silver compounds while allowing the silver ion to maintain its therapeutic action against cariogenic bacteria and demineralized enamel, thus transforming a harmful property into a benign one
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 SCF effectively arrests carious lesions, promotes remineralization of enamel/dentin, and exhibits antimicrobial activity without causing staining, making it a safer and more effective alternative to traditional SDF solutions.
Implementation Method 1
a silver cation complexed by a pair of water-soluble phosphine ligands, which can be the same or different, and a fluoride anion, where each of the phosphine ligands includes a phosphorous that bonds to the silver cation
Implementation Method 2
including two or more hydrogen bond acceptors to assure that the SCF is water soluble
Implementation Method 3
The caries lesion can be re-mineralized by forming a fluoride substituted hydroxyapatite from fluoride ions
Implementation Method 4
The silver ion exhibits strong antimicrobial activity against a broad spectrum of bacteria
Data Source
AI summary
An agent for an arrest of dental caries is a silver complex fluoride (SCF) of the structure: [Ag(1,3,5-triaza-7-phosphaadamantane)2]F, (Ag(PTA)2F). The agent effectively arrests dental caries and promotes remineralization of carious lesions. The agent results in minimal staining of teeth and tissue inflammation. The therapeutic agent can be applied selectively to a site of caries or other damaged tissue in the oral cavity.