Two-Part Dental Adhesive Composition with Linear Siloxane for Ceramic Bonding
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Solution Overview
Problem
Conventional dental adhesive compositions exhibit insufficient adhesive strength to ceramics.
Innovation Solution
A dental adhesive composition is formulated as a two-part system, where the first agent contains a (meth)acrylate with an acid group and a linear siloxane represented by a specific general formula, and the second agent contains a (meth)acrylate, enhancing adhesive strength to ceramics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional two-part dental adhesive composition is used, then adhesive strength to tooth and composite resin is improved, but adhesive strength to ceramics remains insufficient
Solution Approach 1:
The patent introduces a linear siloxane compound with specific molecular structure (formula 1) as a new component in the primer composition. This siloxane compound acts as a bridge between the conventional adhesive components and the ceramic surface, creating a composite adhesive system that maintains bonding to tooth and composite resin while adding specific affinity for ceramic surfaces through the siloxane group's interaction with ceramic oxides.
Solution Approach 2:
The patent modifies the chemical composition parameters of the primer by incorporating the linear siloxane compound with controlled molecular weight (500-10,000) and specific structural parameters (m=0-500). This parameter change in the adhesive composition enables simultaneous achievement of strong bonding to multiple substrates including ceramics, which was not possible with conventional adhesive formulations.
2Strength
If adhesive composition is formulated for strong bonding to tooth and composite resin, then those bonds are strengthened, but ceramic bonding capability is not achieved
Solution Approach 1:
The linear siloxane compound provides multi-functional capability to the adhesive system. It maintains the original adhesive's ability to bond to tooth structure and composite resin while simultaneously providing new functionality for bonding to ceramic surfaces. This universal bonding capability across multiple substrates (tooth, composite resin, and ceramic) is achieved through the siloxane compound's unique chemical properties that interface with different material surfaces.
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 achieves excellent adhesive strength to ceramics, as well as to enamel and dentin, improving the durability and effectiveness of dental bonding.
Implementation Method 1
a linear siloxane represented by a general formula (1)... excellent adhesive strength to ceramics
Implementation Method 2
a polymerizable monomer having an acidic group, a polymerizable monomer having a hydroxyl group... a polymerizable monomer
Data Source
AI summary
A dental adhesive composition provided as a two-part formulation including a first agent and a second agent, wherein the first agent contains a (meth)acrylate having an acid group and a linear siloxane represented by a general formula (1)(in the general formula (1), X1 to X6 are independently an alkyl group or an ethylenically unsaturated group having 1 or more and 6 or less carbon atoms; m is an integer of 0 or more and 500 or less; in a case where m is 2 or more, X3 and X4 are same or different for each repeating unit; Y1 and Y2 are independently a linear hydrocarbon group or a branched hydrocarbon group having 1 or more and 20 or less carbon atoms; Z1 to Z4 are independently a hydrogen atom or an ethylenically unsaturated group; and at least one of X1 to X6 or Z1 to Z4 is an ethylenically unsaturated group), and the second agent contains a (meth)acrylate.