Paste-Type Dental Cement for Temporary Restoration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dental cements used for permanent restorations are not suitable for temporary applications, as they exhibit strong adhesiveness and strength that make it difficult to remove dental prostheses and temporary fillings without leaving residue on the tooth surface.
Innovation Solution
A paste-type dental cement comprising phosphoric acid and/or a polymer of α-β unsaturated carboxylic acid, an oxide powder capable of reacting with these components, and water, with a liquid component that does not react with the oxide powder, allowing for easy removal and temporary use without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If permanent dental cements are used for temporary adhering or temporary filling, then the strength and adhesiveness of the cement are improved, but the ease of removal deteriorates and residue remains on the tooth surface
Solution Approach 1:
The patent changes the chemical composition parameters of the dental cement by incorporating water-soluble polymers (carboxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl starch) and specific ratios of zinc oxide to phosphoric acid. These parameter changes modify the cement's properties to achieve both adequate strength for temporary use and water solubility for easy removal without residue
Solution Approach 2:
The patent creates a composite dental cement material combining zinc oxide powder, phosphoric acid, water-soluble polymers, and other additives. This composite formulation integrates the strength-providing zinc oxide-phosphoric acid reaction with the water-soluble polymer matrix that enables easy removal and prevents residue formation
2Reliability
If permanent dental cements are used for temporary applications, then the adhesive properties are improved, but the time required for removal increases
Solution Approach 1:
The patent modifies the chemical parameters by controlling the zinc oxide to phosphoric acid ratio and incorporating water-soluble polymers at specific concentrations. These parameter changes create a cement that bonds reliably during temporary use but dissolves quickly in water, dramatically reducing removal time from what would traditionally require extensive mechanical removal to a simple water-rinse procedure
3Reliability
If the cement is made with strong adhesiveness for permanent restoration, then the reliability of the bonding is improved, but the ease of cleaning the tooth surface after removal deteriorates
Solution Approach 1:
The patent changes the chemical composition to include water-soluble polymers and controls the setting reaction parameters. This creates a cement that forms reliable temporary bonds but maintains water solubility, allowing the tooth surface to be cleaned easily with water rinsing rather than requiring mechanical scraping or chemical etching procedures
Solution Approach 2:
The water-soluble polymers act as an intermediary substance that mediates between the zinc oxide-phosphoric acid bonding mechanism and the removal process. This intermediary provides both adequate bonding strength during use and water solubility for easy removal, eliminating the need for aggressive cleaning methods
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 cement enables easy removal of dental prostheses and temporary fillings without leaving residue, maintaining adequate strength and adhesiveness for temporary applications.
Implementation Method 1
a phosphoric acid and/or a polymer of α-β unsaturated carboxylic acid, an oxide powder capable of reacting with the phosphoric acid and/or the polymer of α-β unsaturated carboxylic acid
Data Source
AI summary
To provide a paste-type dental cement capable of being used properly for temporary adhering or temporary filling, a paste-type dental cement, which comprises a phosphoric acid and/or a polymer of α-β unsaturated carboxylic acid, an oxide powder capable of reacting with the phosphoric acid and/or the polymer of α-β unsaturated carboxylic acid, and water, further includes a liquid not reacting with the oxide powder.