Dental Retraction Paste Using Guanidinyl Polymer and Carrageenan
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Solution Overview
Problem
Current dental retraction materials face challenges in effectively absorbing fluids, coagulating blood, and being easily removable from the gingival sulcus, with issues related to viscosity changes during storage and difficulty in application and removal.
Innovation Solution
A dental retraction composition comprising guanidinyl-containing polymer, carrageenan, and organic acid, which absorbs fluids, coagulates blood, and maintains stability, allowing for easy application and removal without the need for excessive water, reducing viscosity issues and enhancing storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If retraction paste is used to retract gingiva, then the paste can be easily applied, but the viscosity changes when fluids like water, saliva or blood are absorbed making it difficult to express into the sulcus
Solution Approach 1:
The patent uses a carboxymethyl cellulose derivative with specific degree of substitution (0.3-0.7) and degree of polymerization (100-500) to maintain stable viscosity. The controlled hydrophilicity parameter changes ensure the paste remains expressible into the sulcus while maintaining adequate viscosity during the procedure.
Solution Approach 2:
The patent creates a composite retraction paste combining carboxymethyl cellulose derivative with astringents (aluminum chloride, ferric chloride, or zinc sulfate). This composite formulation balances the viscosity-stability issue while maintaining hemostatic properties and ease of application.
2Ease of operation
If non-hardening paste is used for retraction, then the paste is easy to apply, but removing it completely from the sulcus is very time consuming and cumbersome
Solution Approach 1:
The patent formulates the retraction paste with controlled viscosity and hydrophilicity characteristics that allow it to be easily expressed into the sulcus and subsequently removed by irrigation. The carboxymethyl cellulose derivative enables the paste to maintain coherence for application but allows complete removal without leaving residues that would interfere with impression taking.
Solution Approach 2:
By controlling the degree of substitution (0.3-0.7) and degree of polymerization (100-500) of the carboxymethyl cellulose derivative, the patent optimizes the paste's viscosity and solubility parameters. This enables easy removal by irrigation while maintaining adequate residence time for effective retraction and hemostis.
3Loss of time
If hardening material is used for retraction, then the material is easier to remove, but it is not very hydrophilic causing problems with flowability into the gingival sulcus
Solution Approach 1:
The patent uses carboxymethyl cellulose derivative with optimized hydrophilicity parameters (degree of substitution 0.3-0.7, degree of polymerization 100-500) to achieve adequate flowability into the sulcus without requiring hardening. The controlled hydrophilic balance allows the paste to be expressed easily and removed completely, eliminating the need for hardening while maintaining removal ease.
4Reliability
If retraction cord is used to retract gingiva, then sufficient vertical and horizontal retraction can be obtained, but the procedure is time consuming and coagulated blood adheres to the cord making removal difficult
Solution Approach 1:
The patent extracts the retraction function from the cord format and implements it as a paste that can be expressed into the sulcus. The paste formulation with carboxymethyl cellulose derivative provides adequate retraction effectiveness while allowing complete removal by irrigation, eliminating the time-consuming manual removal process and the problem of blood-adhered cord material.
Solution Approach 2:
The patent introduces an intermediary substance (carboxymethyl cellulose derivative-based paste) that mediates between the gingival tissue and the sulcus. This intermediary provides retraction effectiveness through its physical presence and astringent action, while its controlled viscosity and solubility properties enable easy removal without adhering to blood or tissue, unlike traditional cords.
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 effectively absorbs fluids, coagulates blood, and is easily removable, improving the efficiency of dental procedures by maintaining stability and reducing the risk of bleeding, while being easy to apply and remove.
Implementation Method 1
The paste expands upon contact with water
Implementation Method 2
The retraction paste has blood coagulating and moisture-absorbing properties
Implementation Method 3
The retraction paste has blood coagulating properties
Data Source
AI summary
The invention relates to a dental retraction composition comprising guanidinyl-containing polymer, carrageenan, filler, paste-forming component, organic acid having a molecular weight of 80 to 250 g/mol, a pks value of 2 to 5, 1 to 3 carboxylic acid moieties, and being soluble in polyethylene glycol with a molecular weight of 400 g/mol, the dental retraction composition not containing water in an amount of more than 5 wt. %, and not containing aluminium chloride in an amount of more than 0.5 wt. %, wt. % with respect to the weight of the dental retraction composition. The dental retraction composition is for use in a process for use in a process of retracting dental tissue in combination with coagulating blood. The invention also relates to a delivery device comprising the dental retraction composition and a kit of parts comprising the delivery device, an applier for the delivery device, optionally a dental impression material, and optionally a retraction cap.