Dental Composite Stabilizing Pasty Property via Defoaming
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Solution Overview
Problem
The stability of the pasty property in dental composite materials is challenging due to variations in mixing methods, packaging containers, and usage conditions, leading to inconsistent usability and quality issues.
Innovation Solution
A process involving the preparation of a composite material with a silanated filler, polymerizable monomer, and polymerization initiator, including specific steps for mixing, defoaming, and evaluation to ensure consistent pasty properties, involving a mixed polymerizable monomer preparing step, composite material preparing step, and preserving steps to maintain stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the composite material is filled in a syringe container and discharged continuously, then the usability is improved, but the pasty property becomes unstable due to thixotropy variations
Solution Approach 1:
The patent applies preliminary action by performing a defoaming step before filling the composite material into the syringe container. This removes bubbles generated during mixing in advance, preventing them from affecting the pasty property stability during subsequent discharge and use. The defoaming is conducted at a specific timing (after mixing, before filling) to eliminate harmful bubbles while maintaining the material's paste characteristics for stable usability.
2Manufacturing precision
If mixing is performed to homogenize the composite material, then the uniformity is improved, but bubbles are generated causing non-uniform polymerization
Solution Approach 1:
The patent converts the harmful effect of mixing-induced bubbles into a beneficial process by introducing a controlled defoaming step. The bubbles generated during mixing are not simply eliminated but are systematically removed through vacuum defoaming at a specific stage, transforming the harmful bubble formation into a controlled process that ensures uniform polymerization and improves final product quality.
Solution Approach 2:
The patent extracts the harmful bubbles from the composite material through a dedicated defoaming step. By applying vacuum pressure after mixing and before filling, the bubbles are separated and removed from the material, leaving a bubble-free composite that maintains uniformity while avoiding non-uniform polymerization issues.
3Duration of action of stationary object
If the composite material is preserved for a predetermined period, then the stability over time is improved, but the pasty property varies from initial to later stages
Solution Approach 1:
The patent applies preliminary action by conducting defoaming and evaluation steps before preservation. The defoaming removes bubbles that would otherwise cause property variations during storage, and the evaluation step identifies optimal preservation conditions. This preliminary preparation ensures the composite material maintains consistent pasty properties throughout the preservation period.
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 process stabilizes the pasty property of the composite material, ensuring consistent usability from initial to later stages of use, reducing thixotropy variations and preventing bubble formation, thus enhancing the quality and reliability of the dental composite material.
Implementation Method 1
a composite material containing a silanated filler, a polymerizable monomer, and a polymerization initiator
Data Source
AI summary
A composite material including silanated filler and mixed polymerizable monomer, having a stable pasty property which keeps well and has a consistent usability. A composite material containing a silanated filler, a polymerizable monomer, and a polymerization initiator, and may be produced by a process which includes in order of a mixed polymerizable monomer preparing step, a mixed polymerizable monomer preserving step, a composite material preparing step, a composite material preserving step, a composite material filling step, and a small quantity preserving container preserving step.