Denture Liner Paste Viscosity Control via Segmented Mixing
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Solution Overview
Problem
Dental plate liners lacking a powder material face challenges with time-dependent viscosity changes suitable for clinical or technical work, leading to complex operations and hygienic issues such as staining, odor, and air bubble incorporation during kneading.
Innovation Solution
A dental plate liner comprising two pastes: one with a (meth)acrylic acid-based polymer and a fluorine-containing (meth)acrylic acid-based polymerizable monomer where the polymer has low solubility, and another with a (meth)acrylic acid-based polymerizable monomer of high solubility, combined to achieve a viscosity increase similar to powder-liquid systems while minimizing staining and odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a powder-liquid system is used for dental plate liner, then time-dependent viscosity change suitable for clinical work is achieved, but operation complexity and hygienic issues (staining, odor, air bubbles) increase
Solution Approach 1:
The material is divided into two separate paste components that are mixed immediately before use. Paste (i) contains the polymer and fluorine-containing monomer, while paste (ii) contains the high solubility monomer and filler. This segmentation allows each component to be optimized independently while avoiding the issues of traditional powder-liquid systems.
Solution Approach 2:
The invention changes the physical state parameter from powder-liquid to paste-paste system. By using two pastes with controlled solubility characteristics, the system achieves time-dependent viscosity change without the operational complexities of powder mixing, including reduced air bubble incorporation and improved hygiene.
2Stability of the object's composition
If a powder-liquid system is used for dental plate liner, then time-dependent viscosity change suitable for clinical work is achieved, but staining and odor problems occur
Solution Approach 1:
The invention uses fluorine-containing (meth)acrylic acid-based polymerizable monomer which has low solubility for the polymer (less than 20 mass%). This low solubility characteristic, which might seem disadvantageous, actually prevents staining and odor issues by reducing the extent of polymer dissolution and swelling that causes these harmful effects, while still allowing time-dependent viscosity change through controlled mixing.
3Manufacturing precision
If viscosity is low for molding operation, then accurate impression can be taken, but sufficient thickness cannot be secured
Solution Approach 1:
The system provides dynamic viscosity control through the time-dependent dissolution and swelling of polymer in monomer after mixing the two pastes. Immediately after mixing, the viscosity is relatively low allowing accurate impression taking, and then viscosity increases over time allowing sufficient thickness to be maintained without material流失.
Solution Approach 2:
The two pastes are mixed immediately before use, initiating the dissolution and swelling process in advance. This preliminary action creates the time-dependent viscosity profile needed: starting with lower viscosity for accurate molding, then increasing to maintain thickness during the procedure.
4Ease of operation
If a paste system without powder material is used, then operation complexity and hygienic issues are reduced, but time-dependent viscosity change suitable for clinical work is lost
Solution Approach 1:
The invention creates a composite paste system combining two different paste formulations. Paste (i) with polymer and fluorine-containing monomer combined with paste (ii) containing high solubility monomer and filler creates a system that exhibits time-dependent viscosity change, achieving both operational simplicity and desired rheological properties.
Solution Approach 2:
By changing the composition parameters of the paste system - specifically incorporating a monomer with high solubility for the polymer (20 mass% or more) along with controlled filler content - the invention restores time-dependent viscosity change while maintaining the operational advantages of a paste system without powder material.
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 solution provides excellent workability with a time-dependent viscosity increase, reduced staining, and improved storage stability, addressing the limitations of existing powder-free dental plate liners.
Implementation Method 1
the (meth)acrylic acid-based polymer gradually dissolves in and swells with the polymerizable monomer
Implementation Method 2
the (meth)acrylic acid-based polymer gradually dissolves in and swells with the polymerizable monomer
Implementation Method 3
a radically polymerizable curable material formed of a monomer capable of being polymerized in the presence of a radical, and a radical polymerization initiator
Data Source
AI summary
Provided is a dental plate liner which has a paste-like form free of the complexity of the measuring and mixing of a powder material and a liquid material, which can provide a viscosity increase comparable to that of a related-art dental plate liner formed of a powder material and a liquid material, which is excellent in workability, and which is free of a problem of stain because of, for example, its coloring resistance. The dental plate liner includes: a paste (i) containing (A) a (meth)acrylic acid-based polymer, and a fluorine-containing (meth)acrylic acid-based polymerizable monomer in which (A) the (meth)acrylic acid-based polymer has a solubility of less than 20 mass%; and a paste (ii) containing a (meth)acrylic acid-based polymerizable monomer in which (A) the (meth)acrylic acid-based polymer has a solubility of 20 mass% or more, and a filler, in which at least one paste selected from the group consisting of the paste (i) and the paste (ii) contains a polymerization initiator, and in which the dental plate liner is used through mixing of the paste (i) and the paste (ii) immediately before use.