Thickened Silver Diamine Fluoride Composition for Dental Application
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Solution Overview
Problem
Silver diamine fluoride (SDF) has low viscosity, making it difficult for dentists to control its application on teeth, leading to potential spills and undesirable pigmentation, and existing solutions do not effectively address the need for improved viscosity and application control.
Innovation Solution
A composition combining silver diamine fluoride with a thickening agent, such as carboxymethyl cellulose, to create a thixotropic solution with controlled viscosity, allowing for precise application and reducing the risk of spills and pigmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver diamine fluoride is applied as a liquid with low viscosity, then the antimicrobial properties and caries prevention effectiveness are maintained, but the application control is difficult leading to spills and unwanted pigmentation on surrounding areas
Solution Approach 1:
The patent changes the physical parameter of viscosity by incorporating thickening agents (carboxymethyl cellulose, hydroxyethyl cellulose, or xanthan gum) into the silver diamine fluoride formulation. This transforms the liquid SDF into a gel-like consistency that maintains the same chemical composition and antimicrobial properties while enabling precise application control and preventing unwanted spread to surrounding tissues.
2Ease of operation
If the viscosity of silver diamine fluoride is increased to improve application control, then spills and unwanted pigmentation are reduced, but the material may become too thick for proper penetration and distribution on the tooth surface
Solution Approach 1:
The patent employs thixotropic agents that create a dynamic viscosity characteristic - the gel remains thick at rest for controlled application but becomes less viscous under shear stress (during brushing or chewing), allowing proper distribution and penetration. This dynamic property ensures both application control and uniform material distribution on the tooth surface.
3Ease of manufacture
If conventional liquid silver diamine fluoride is used, then the formulation is simple and easy to prepare, but the low viscosity causes the material to run off the intended location and contact gums, mucosal surfaces, tongue, lips, and face
Solution Approach 1:
The patent creates a composite formulation by combining silver diamine fluoride with hydrocolloidal thickening agents (carboxymethyl cellulose, hydroxyethyl cellulose, or xanthan gum). This composite gel structure maintains the therapeutic properties of SDF while adding viscosity control, preventing the material from running off and contacting surrounding soft tissues that could be irritated.
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 thixotropic SDF composition enables controlled application, effectively preventing dental caries and reducing thermal and mechanical hypersensitivity, while maintaining the antimicrobial properties of SDF without adverse effects.
Implementation Method 1
silver diamine fluoride which is thixotropic and has a viscosity of 0.02 to 500 Pa s
Implementation Method 2
a thickening agent, such as a cellulose derived component that provides increased viscosity
Data Source
AI summary
A composition for oral application comprising silver diamine fluoride that is thixotropic and has a viscosity of 0.02 to 500 Pa·s as measured by a TA AR-G2 rheometer with a 40 mm cone and plate, carried out at a temperature of about 23 #C, and a shear rate of from 0.1/second to 100/second. The thixotropic properties allow for improved application by a dentist.