Self-Etching Dental Resin Cement Merging Etch and Bond
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Solution Overview
Problem
Current dental resin cement compositions require multiple steps, including etching and bonding procedures, which are time-consuming and can increase dental sensitivity, and do not provide adequate adhesion to composite or ceramic restorations.
Innovation Solution
A self-etching and bonding dental resin cement composition comprising a polymerizable (meth)acrylate carboxylic acid/anhydride, a copolymerizable multi-functional (meth)acrylate, a diluent, a filler, and a curing system, formulated as a two-paste system that combines to etch and bond the tooth surface in a single step without the need for additional etchants or adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If separate etching and bonding steps are used, then adhesion to tooth structure 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 (carboxylic acid/anhydride groups) and bonding resin components, allowing simultaneous etching of tooth structure and formation of adhesive bond in one application step, eliminating the need for separate etching and bonding procedures
Solution Approach 2:
The self-etching resin cement composition serves multiple functions: it acts as an etchant to remove smear layer and demineralize tooth surface, simultaneously serves as a primer to penetrate and adhere to dentin, and functions as the bonding agent to attach the restoration. This multi-functional composition replaces the traditional multi-step system with a single universal material
2Strength
If strong etchants are used to improve bonding, then adhesion is enhanced, but dental sensitivity increases
Solution Approach 1:
The patent modifies the etching mechanism by using weak organic acid etchants (carboxylic acid groups with pKa 2-6) instead of strong inorganic acids. This parameter change in acid strength and type allows effective smear layer removal and demineralization while being gentler on the tooth structure, thereby reducing post-operative sensitivity while maintaining adequate bonding strength
3Strength
If multiple separate materials (etchant, primer, bonding adhesive) are used, then adhesion is improved, but the number of steps and complexity increase
Solution Approach 1:
The patent merges etchant, primer, and bonding adhesive into a single integrated self-etching resin cement composition. The composition contains carboxylic acid/anhydride groups for etching, hydrophilic components for primer action, and hydrophobic polymeric components for bonding, all in one material that simplifies the procedure to a single application step
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
This composition simplifies the dental cementation process by eliminating the need for separate etching and bonding steps, enhancing adhesion to tooth surfaces, reducing sensitivity, and providing a reliable bond for various dental restoration materials.
Implementation Method 1
a polymerizable (meth)acrylate carboxylic acid/anhydride... self-etching and bonding dental resin cement composition... etch the tooth surface
Implementation Method 2
a copolymerizable multi-functional (meth)acrylate... curing system... adhered the restoration to the tooth surface, and the cement composition is allowed to cure
Data Source
AI summary
A self-etching, dental cement composition is provided having the advantage of not requiring a separate etching and bonding step.