Dental Curable Material Kit Curing Control
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Solution Overview
Problem
The existing powder-liquid dental curable material kits face challenges in controlling curing time and heat generation, particularly when using the brush-on technique, leading to prolonged curing times and operational inefficiencies compared to the kneading technique, necessitating separate kits for each method.
Innovation Solution
Incorporating a combination of an organic halogen compound, a pyrimidinetrione compound, an organic metal compound, and benzoyl peroxide as a radical polymerization initiator, with the benzoyl peroxide serving as an oxygen supply source, to regulate the curing rate and prevent excessive prolongation of curing time in the brush-on technique, allowing for a shared kit suitable for both techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a radical chain transfer agent is used to control curing time and suppress heat generation, then heat generation is suppressed and curing rate is slowed down, but curing time becomes excessively prolonged when using the brush-on technique
Solution Approach 1:
The patent applies parameter changes by introducing a peroxide substance that modifies the chemical composition of the curable material. This peroxide serves as an oxygen supply source that regulates the polymerization reaction rate, enabling control over both heat generation and curing time. The specific parameter changed is the oxygen concentration available during polymerization, which directly affects the reaction kinetics and thermal characteristics.
Solution Approach 2:
The patent creates a composite curable material system by combining multiple components: radically polymerizable monomers, non-crosslinked resin particles, radical chain transfer agents, and peroxide substances. This composite approach allows the material to exhibit balanced properties where heat generation is suppressed and curing time is controlled simultaneously, resolving the contradiction between these two parameters that cannot be achieved with single-component systems.
2Ease of operation
If the brush-on technique is used to apply the curable material, then precise application is achieved, but curing time is excessively prolonged compared to the kneading technique
Solution Approach 1:
The peroxide substance changes the reaction parameters by providing controlled oxygen supply during polymerization. This regulation ensures that even when using the brush-on technique with its slower mixing characteristics, the curing time remains within an acceptable range while maintaining the precision advantages of the technique.
3Productivity
If a chemical polymerization type radical polymerization initiator is used to polymerize the monomer, then polymerization is initiated effectively, but heat generation during curing becomes excessive
Solution Approach 1:
The patent employs a composite initiator system combining radical chain transfer agents and peroxide substances. This composite approach replaces or supplements traditional high-exotherm chemical polymerization initiators, achieving effective polymerization initiation while significantly reducing heat generation through the controlled decomposition and oxygen-release mechanism of the peroxide.
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
This solution effectively controls curing time and reduces heat generation, ensuring appropriate curing times for both the brush-on and kneading techniques, enhancing operational efficiency and usability of the dental curable material kit.
Implementation Method 1
a peroxide (Z), which is blended in at least one of the liquid material (A) and the powder material (B), the peroxide being benzoyl peroxide, serving as an oxygen supply source
Implementation Method 2
a chemical polymerization type radical polymerization initiator composed of a plurality of constituent components is used to polymerize the above radically polymerizable (meth)acrylic monomer
Data Source
Figure 1
AI summary
A powder-liquid dental curable material kit composed of (A) a liquid material and (B) a powder material, wherein the liquid material (A) contains (a1) a radically polymerizable (meth)acrylic monomer, (a2) an organic halogen compound and (a3) a radical chain transfer agent; the powder material (B) contains (b1) non-crosslinked resin particles, (b2) a pyrimidinetrione compound and (b3) an organic metal compound; and (Z) a peroxide is blended in at least one of the liquid material (A) and the powder material (B). This curable material kit is capable of reducing the heat generation during the curing of a curable material which is a mixture of the liquid material (A) and the powder material (B) and is not susceptible to the excessive prolongation of the curing time even when the curable material is cured by a brush-on technique, thereby ensuring an appropriate curing time for both of a brush-on technique and a kneading technique.