Two-Paste Dental Self-Adhesive Resin Cement
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Solution Overview
Problem
Current dental resin cements require primer treatment for various adherends like teeth, ceramic, and metal materials, which complicates the adhesion process and may not provide sufficient adherability, especially for enamel and dentin.
Innovation Solution
A two-paste type dental self-adhesive composite resin cement comprising radical polymerizable monomers, polymerizable monomers with phosphonic acid or phosphoric acid groups, and a filler, along with a polymerization catalyst, that does not require a primer for adhesion, utilizing a combination of phosphonic acid and dibasic acid carboxyl groups for enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer is used for pre-treating tooth surfaces to enhance adherability, then adhesion to enamel and dentin is improved, but the adhesion procedure becomes more complex and time-consuming
Solution Approach 1:
The resin cement is formulated with multiple adhesive functional groups (carboxyl, phosphonic acid, phosphoric acid ester) that can simultaneously bond to different adherends including enamel, dentin, ceramic, and metal materials, eliminating the need for separate primers for each surface type
Solution Approach 2:
The invention combines the functions of multiple primers (for enamel, dentin, ceramic, and metal) into a single resin cement formulation, integrating all adhesive functionalities in one material that simplifies the overall adhesion procedure
2Ease of operation
If a powder-liquid type resin cement is used, then the adhesion process is simpler, but mixing time increases and results vary between persons
Solution Approach 1:
The resin cement is divided into two separate paste formulations (first paste with carboxyl-containing monomers and second paste with phosphonic acid/phosphoric acid ester monomers) that are mixed in a controlled manner, providing better mixing control and consistent results compared to powder-liquid types
3Device complexity
If a single acidic monomer is used in the resin cement, then the formulation is simpler, but sufficient adherability cannot be attained for both enamel and dentin
Solution Approach 1:
The resin cement uses a composite formulation combining multiple types of monomers (carboxyl-containing, phosphonic acid-containing, and phosphoric acid ester-containing monomers) that work synergistically to provide comprehensive adhesion to different tooth structures and materials
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 solution achieves strong and clinically acceptable adherability for enamel, dentin, ceramic, and metal materials without primer treatment, exhibiting effective shear and tensile bond strengths, simplifying the dental adhesion process.
Implementation Method 1
a polymerizable monomer having a phosphonic acid group and/or a phosphoric acid ester group, and a polymerizable monomer having a dibasic acid carboxyl group
Implementation Method 2
a radical polymerizable monomer, and a polymerization catalyst
Data Source
AI summary
The present invention provides a dental self-adhesive resin cement having clinically-acceptable adherability for various adherends without pre-treatment with primers. Specifically, there is provided the dental self-adhesive composite resin cement comprising:(a) a radical polymerizable monomer,(b) a polymerizable monomer having a phosphonic acid group and/or a phosphoric acid ester group,(c) a polymerizable monomer having a dibasic acid carboxyl group,(d) a filler, and(e) a polymerization catalyst.