Self-Etching Dental Cement Merging Etch and Bond Steps
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Solution Overview
Problem
Current dental resin cement compositions require multiple steps for effective adhesion to tooth surfaces, including separate etching and bonding procedures, which are time-consuming and can increase dental sensitivity.
Innovation Solution
A self-etching and bonding dental resin cement composition comprising a two-paste system with polymerizable (meth)acrylate trimellitic acid/anhydride, phosphoric acid (meth)acrylate, hydroxyalkyl(meth)acrylate, and copolymerizable multi-functional (meth)acrylates, which can etch and bond to tooth surfaces in a single step without the need for additional etchants or bonding adhesives, and can be self-curable or dual-curable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate etching and bonding procedures are used, then adhesion to tooth surfaces is improved, but the procedure becomes time-consuming and complex
Solution Approach 1:
The patent combines the etching and bonding functions into a single self-etching resin cement composition. The composition contains both etching agents (phosphoric acid, polyacrylic acid) and bonding resins (polymerizable (meth)acrylates) that work simultaneously, eliminating the need for separate application steps while maintaining effective adhesion to tooth surfaces
Solution Approach 2:
The self-etching resin cement composition serves multiple functions in a single product: it acts as both an etching agent to prepare the tooth surface and as a bonding adhesive to secure the restoration. This multi-functional formulation reduces the number of required materials and procedural steps
2Reliability
If strong etchants are used, then adhesion is improved, but dental sensitivity increases
Solution Approach 1:
The patent modifies the chemical parameters of the etching system by using milder acids (phosphoric acid, polyacrylic acid) with controlled concentrations instead of strong etchants. This parameter change reduces the harmful effects on tooth structure and patient sensitivity while maintaining sufficient etching capability for effective bonding
Solution Approach 2:
The patent converts the potentially harmful strong etching action into a beneficial mild etching process. By using weaker acids that cause less sensitivity, the formulation achieves effective adhesion without the adverse effects of strong etchants, turning a limitation into an advantage
3Reliability
If multiple separate materials (etchant, primer, bonding adhesive) are used, then adhesion is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate materials (etchant, primer, and bonding adhesive) into a single self-etching resin cement composition. The formulation integrates etching agents, bonding resins, and necessary additives into one unified product that performs all functions simultaneously, reducing material complexity
4Ease of operation
If conventional luting cements are used for metal restorations, then bonding without separate bonding step is achieved, but bonding ability to tooth structure is poor
Solution Approach 1:
The patent creates a composite material formulation that combines the simplicity of luting cements with the bonding capability of resin adhesives. The self-etching resin cement contains polymerizable (meth)acrylates for resin bonding, phosphoric acid for etching, and fillers for strength, creating a multi-component composite that achieves both ease of use and reliable bonding to tooth structure
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 composition provides improved adhesion and reduced sensitivity by eliminating the need for multiple steps, allowing for reliable bonding of dental restorations to teeth without the use of etchants or additional adhesives, while maintaining stability and reducing hydroscopic expansion.
Implementation Method 1
comprising polymerizable (meth)acrylate resins
Implementation Method 2
a self-etching and bonding dental resin cement composition... phosphoric acid (meth)acrylate; a hydroxyalkyl(meth)acrylate
Data Source
AI summary
A self etching, dental cement composition is provided having the advantage of not requiring a separate etching and bonding step. The cement composition comprises a polymerizable (meth)acrylate trimellitic acid/anhydride, a phosphoric acid (meth)acrylate, a hydroxyalkyl(meth)acrylate, copolymerizable multi-functional (meth)acrylate monomers, a diluent, fillers, and a curing system. These cement compositions are prepared as a two-paste system that is combined prior to use.