Self-Neutralizing Calcium Hydroxide Dental Material
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Solution Overview
Problem
Current dental capping therapies face challenges such as long operation times, high costs, cell virulence, and poor operability due to the use of materials like formocresol, ferric sulfate, and Mineral Trioxide Aggregate (MTA), which have limitations in direct pulp capping and induce hydration heat, leading to restricted usage.
Innovation Solution
A self-neutralizing calcium hydroxide preparation is developed by mixing active silica material, bismuth oxide, silica, sulfur trioxide, and aluminum oxide/red oxide with Portland cement clinker, which hardens quickly in a saline solution, providing excellent chemical resistance and bioaffinity for dental pulp preservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mineral Trioxide Aggregate (MTA) is used for pulp capping therapy, then bioaffinity and guided regeneration capability are improved, but hydration heat generation increases and neutralisation time extends
Solution Approach 1:
The invention uses a composite material consisting of calcium hydroxide as the base material combined with specific additives (sulfur trioxide, bismuth oxide, aluminum oxide/red oxide, and active silica material) to achieve both high bioaffinity and self-neutralization capability, resolving the contradiction between MTA's biological benefits and its heat generation issues
Solution Approach 2:
The preparation is designed to automatically neutralize the calcium hydroxide produced during hydration through the inclusion of sulfur trioxide and other additives that react with calcium hydroxide to form stable compounds, eliminating the need for external neutralization agents and enabling self-regulation of pH and heat
2Loss of time
If self-reacting or photo-reacting calcium hydroxide preparation is used, then setting time is reduced, but compression strength and chemical resistance decrease
Solution Approach 1:
The invention creates a composite system where calcium hydroxide is enhanced with sulfur trioxide, bismuth oxide, aluminum oxide/red oxide, and active silica material. This composite structure provides both rapid setting through the chemical reactions of additives and high strength/chemical resistance through the formation of stable calcium silicate and other reaction products
Solution Approach 2:
The invention modifies the chemical composition parameters by adding specific ratios of sulfur trioxide (1-10 parts), bismuth oxide (1-10 parts), aluminum oxide/red oxide (1-10 parts), and active silica material (1-10 parts) per 100 parts of calcium hydroxide, which changes the setting characteristics and mechanical properties to achieve both fast setting and high strength
3Reliability
If MTA is used for root canal treatment, then treatment effectiveness for damaged root canals is improved, but operation time and cost increase
Solution Approach 1:
The preparation automatically neutralizes calcium hydroxide and stabilizes pH through its built-in sulfur trioxide and other additives, eliminating the need for multiple visits or additional neutralization procedures required by MTA, thereby reducing operation time while maintaining treatment effectiveness
Solution Approach 2:
The invention uses a cost-effective formulation based on calcium hydroxide with affordable additives, replacing expensive MTA while achieving similar or superior clinical outcomes through rapid setting and self-neutralization properties
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 self-neutralizing calcium hydroxide preparation enhances the success rate of direct and indirect pulp capping therapies, allows for faster hardening, and maintains pulp vitality, making it suitable for treating damaged teeth and infected root canals with improved operability and reduced treatment time.
Implementation Method 1
neutralising calcium hydroxide produced during hydration
Implementation Method 2
mixing to a cement clinker an active silica material, bismuth oxide (Bi2O5), silica, sulfur trioxide and aluminum oxide/red oxide (Fe2O3)
Data Source
AI summary
The present invention relates to a self-neutralising type of calcium hydroxide (Ca(OH)2) preparation for use in dentistry. More specifically, it relates to a self-neutralising type of calcium hydroxide preparation which is formulated in such a way that it can be used in dentistry by being mixed, in a cement clinker, with an active siliceous substance, bismuth oxide (Bi2O5), silica, sulphur trioxide and aluminum oxide/ferric oxide and the like. One aspect of the present invention provides a self-neutralising type of calcium hydroxide preparation comprising an active siliceous substance and bismuth oxide, and this self-neutralising type of calcium hydroxide preparation is characterized in that it comprises silica, sulphur trioxide and aluminum oxide/ferric oxide.