Two-Paste Polymerizable Composition for Dental Adhesives
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Solution Overview
Problem
The existing polymerizable compositions for dental use face challenges with storage stability and reactivity issues due to the inclusion of organic peroxides and barbiturate compounds, leading to gelation problems and inadequate material characteristics, especially when used in paste form without plasticizers to prevent elution and improve adhesion.
Innovation Solution
A polymerizable composition in two-paste form is developed, comprising a first paste with a (meth) acrylate compound, a barbiturate compound, an amino carboxylic acid-based chelating agent, a peroxy compound, and a filler, and a second paste with an organic halogen compound, an organic metallic compound, and a filler, both without plasticizers, to enhance storage stability and reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an organic peroxide and a barbiturate compound are combined in the same paste to enhance reactivity, then polymerization performance is improved, but the paste gelatinizes during storage due to excessive reactivity
Solution Approach 1:
The polymerizable composition is divided into two separate pastes: a first paste containing the organic peroxide and barbiturate compound, and a second paste containing other components. This segmentation prevents premature reaction between the peroxide and barbiturate compound during storage, eliminating gelatinization while maintaining high reactivity when the pastes are mixed and used.
2Stability of the object's composition
If a plasticizer is added to prevent gelatinization of the paste, then storage stability is improved, but the plasticizer may be eluted in the oral cavity and adversely affect the patient
Solution Approach 1:
The harmful plasticizer component is completely removed from the polymerizable composition. Instead, the invention uses a two-paste system where the organic peroxide and barbiturate compound are separated, preventing gelatinization without requiring plasticizers. This extraction of harmful substances eliminates elution risks while maintaining storage stability.
3Stability of the object's composition
If a plasticizer is added to prevent gelatinization, then storage stability is improved, but the plasticizer covers the surface after polymerization and adheres to the operator's hand, worsening operational feeling
Solution Approach 1:
The plasticizer is completely removed from the composition. The two-paste system prevents gelatinization through physical separation of reactive components rather than through plasticizer addition, thereby eliminating all plasticizer-related operational issues such as surface coverage and hand adhesion.
4Stability of the object's composition
If a plasticizer is added to prevent gelatinization, then storage stability is improved, but the adhesion force of the adhesive is adversely affected
Solution Approach 1:
The plasticizer is completely removed from the system. Storage stability is achieved through the two-paste formulation that prevents premature reaction between organic peroxide and barbiturate compound. This eliminates the trade-off between storage stability and adhesion force, allowing both properties to be optimized simultaneously.
5Stability of the object's composition
If the polymerizable composition is prepared in powder form to avoid gelatinization, then storage stability is improved, but the operation in dental treatment becomes complicated
Solution Approach 1:
The physical state of the composition is changed from powder to paste form by incorporating the organic peroxide into the (meth)acrylate compound. The two-paste system maintains this paste form while preventing gelatinization through separation of reactive components, thereby improving operational convenience while maintaining storage stability.
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 excellent storage stability and reactivity while preventing plasticizer elution, maintaining effective adhesion and material characteristics, even after prolonged use in the oral cavity.
Implementation Method 1
an amino carboxylic acid-based chelating agent
Implementation Method 2
a barbiturate compound; an amino carboxylic acid-based chelating agent; a peroxy compound
Data Source
AI summary
A polymerizable composition includes at least one of an acrylate compound and a methacrylate compound; a barbiturate compound; an amino carboxylic acid-based chelating agent; a peroxy compound; and filler.