Dental Retraction Paste Using Silicate Mineral Ratios
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Solution Overview
Problem
Current dental retraction compositions face challenges in efficiently retracting soft tissue from hard tissue due to difficulties in application and removal, often resulting in incomplete retraction, bleeding, and interference with impression material setting.
Innovation Solution
A dental retraction composition comprising a mixture of layer type 1:1 and layer type 2:1 silicate minerals in a specific ratio, combined with a liquid, which provides a suitable storage modulus for effective application and easy rinsing, utilizing a container with a cannula for precise dispensing and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retraction cords are packed into the sulcus to achieve sufficient vertical and horizontal retraction, then retraction effectiveness is improved, but the procedure becomes time-consuming and difficult to place and remove
Solution Approach 1:
The invention changes the physical state of the retraction material from solid cord to paste form, and modifies its rheological parameters by incorporating specific clay minerals (kaolin, bentonite) that provide thixotropic behavior. This allows the material to be easily injected in a fluid state and then set to a firm consistency, dramatically reducing placement and removal time while maintaining retraction effectiveness
Solution Approach 2:
The invention replaces the mechanical packing method (manual insertion of cords) with a controlled injection system using a syringe and cannula. This substitution allows precise delivery of the retraction paste into the sulcus without the manual dexterity requirements and time constraints of cord packing, while the cannula itself provides additional mechanical retraction through its tapered design
2Ease of operation
If Expasyl paste is used for retraction, then ease of application is improved, but viscosity changes when fluids are absorbed making it difficult to express into the sulcus
Solution Approach 1:
The invention uses a composite material system combining multiple clay minerals (kaolin and bentonite in specific ratios) with hydrogen peroxide and other components. This composite formulation provides controlled viscosity characteristics and thixotropic behavior, ensuring the paste remains pumpable through the syringe system while maintaining stability and predictability during application, unlike single-component systems
Solution Approach 2:
The invention modifies the rheological parameters of the retraction paste by incorporating specific clay mineral ratios and chemical additives that stabilize viscosity. The material is designed to maintain consistent flow properties throughout the procedure, preventing the viscosity changes that occur with fluid absorption in conventional pastes, thereby ensuring reliable expression through the cannula
3Ease of operation
If non-hardening pastes are used for retraction, then ease of application is improved, but complete removal becomes very time-consuming and cumbersome
Solution Approach 1:
The invention utilizes a phase transition approach where the retraction paste transitions from a soft, injectable state to a firm but removable set state. The material sets sufficiently to maintain retraction and prevent displacement, yet remains soluble and removable with water spray, eliminating the time-consuming manual removal required for non-setting pastes while avoiding the permanence of hardening materials
4Loss of time
If hardening materials are used for retraction, then ease of removal is improved, but flowability into the gingival sulcus is compromised
Solution Approach 1:
The invention creates a dynamic material system that adapts its physical properties during the procedure. The paste is formulated to be soft and flowable during injection to ensure easy delivery into the sulcus, then sets to a firm consistency for stable retraction, yet remains water-soluble for quick removal. This dynamic property change eliminates the trade-off between flowability and removal ease
5Reliability
If a composition with high storage modulus is used for effective retraction, then retraction effectiveness is improved, but extrusion force required increases
Solution Approach 1:
The invention employs a time-dependent rheological profile where the material exhibits different mechanical properties at different stages. During injection, the paste maintains low viscosity for easy extrusion, then undergoes a setting reaction that increases storage modulus for effective retraction. This temporal separation of properties allows both easy application and effective performance without requiring high extrusion force
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 efficient mechanical retraction with a short rinsing time, reducing bleeding and ensuring accurate impression taking by maintaining a balance between storage modulus and extrusion force, facilitating a more convenient and effective dental procedure.
Implementation Method 1
The composition can be used for retracting soft tissue from hard dental tissue
Implementation Method 2
provides a suitable storage modulus for effective application and easy rinsing, maintaining a balance between storage modulus and extrusion force
Implementation Method 3
the paste is rinsed off using water-spray
Data Source
AI summary
The invention features a composition which can or is to be used in a dental retraction, the composition comprising liquid a liquid and a layer type 1:1 silicate mineral and a layer type 2:1 silicate mineral in a ratio from about 50/50 to 5/95 wt.-% with respect to each other. The invention also relates to a container containing the dental retraction composition and to a kit comprising parts A and B, wherein part A comprises the dental retraction composition and part B comprises at least one accessory selected from the group of applier, dental impression material, retraction cap(s), a container for storing and dispensing the composition and combinations thereof. The invention further features a process of dispensing a dental retraction composition, the process comprising the steps: providing a dental retraction composition contained in a container, placing the container in an applier, and using the applier for dispensing the dental retraction composition out of the container.