Citrate Ester Temporary Crown Material
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Solution Overview
Problem
The existing temporary crown materials rely on phthalate ester compounds, which are toxic and difficult to decompose, posing environmental and health risks, necessitating a biocompatible alternative with effective plasticizing properties.
Innovation Solution
A composition of temporary crown material using a citrate ester compound as a plasticizer, specifically triethyl citrate or acetyl tributyl citrate, combined with poly methyl methacrylate and other reagents to form a powder and liquid reagent mixture that cures at room temperature, providing high hardness, toughness, and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phthalate ester compounds are used as plasticizers in temporary crown materials, then good plasticizing effect and flexibility are achieved, but biological toxicity and environmental harm increase
Solution Approach 1:
The patent changes the chemical composition parameter by replacing phthalate ester plasticizers with citrate ester plasticizers (such as acetyl tributyl citrate or triethyl citrate). This substitution maintains the plasticizing function while fundamentally altering the toxicological profile, reducing biological toxicity and environmental harm while preserving the desired flexibility and workability of the temporary crown material
Solution Approach 2:
The patent converts the harmful phthalate ester compounds into beneficial citrate ester compounds. Citrate esters are naturally occurring substances that are biocompatible and environmentally friendly, thus transforming a harmful chemical class into a beneficial one while maintaining the essential plasticizing properties needed for temporary crown material performance
2Object-affected harmful factors
If citrate ester compound is used as a plasticizer instead of phthalate ester, then biocompatibility and environmental safety are improved, but plasticizing effectiveness may be reduced
Solution Approach 1:
The patent optimizes the concentration parameter of citrate ester plasticizer in the composition formula. By carefully adjusting the amount of citrate ester plasticizer and balancing it with other components (PMMA powder, monomer, initiators), the patent achieves sufficient plasticizing effect while maintaining the biocompatibility advantages of citrate esters
Solution Approach 2:
The patent creates a composite material system combining PMMA powder, monomer, initiator, and citrate ester plasticizer in specific proportions. This composite approach allows the citrate ester to work synergistically with other components to achieve adequate plasticizing effect while maintaining low toxicity, compensating for any individual component limitations through the composite system
3Use of energy by stationary object
If room temperature curing is used for temporary crown material, then processing simplicity and energy efficiency are improved, but curing time and reaction control become more difficult
Solution Approach 1:
The patent changes the temperature parameter of the curing process by formulating the chemical composition to enable polymerization at room temperature (20-25°C). The specific combination of initiator and monomer is selected to have appropriate reactivity at ambient temperatures, eliminating the need for external heating while maintaining acceptable curing times
Solution Approach 2:
The patent discards the external energy input (heating equipment, energy consumption) by designing a self-sufficient chemical system. The room temperature curing formulation allows the material to cure using only ambient environmental temperature, recovering the energy that would otherwise be required for heating and simplifying the processing procedure
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 citrate ester-based temporary crowns exhibit excellent flexural strength, biocompatibility, and compliance with international standards, reducing toxicity and environmental impact while maintaining performance comparable to phthalate-based materials.
Implementation Method 1
The plasticizer is a citrate ester compound... The citrate ester-based temporary crowns exhibit excellent flexural strength, biocompatibility
Implementation Method 2
mixing the powder reagent with the liquid reagent to obtain a mixture; placing the mixture at room temperature, which allows the mixture to cure
Data Source
AI summary
The present invention is directed to a composition of temporary crown materials, comprising a powder reagent and a liquid reagent; wherein the powder reagent comprises PMMA and an initiator, and the liquid reagent comprises MMA, a catalyst, and a plasticizer; wherein the plasticizer is a citrate ester compound. The composition of temporary crown materials of the present invention has high hardness, high toughness, high flexural strength and excellent biocompatibility.