Self-Adhesive Dental Compositions with Acidic Monomers
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Solution Overview
Problem
Conventional self-adhesive compositions for dental structures often lack excellent mechanical properties while achieving good adhesion to untreated dental surfaces, and vice versa, where good mechanical properties result in poor adhesion.
Innovation Solution
A self-adhesive composition comprising specific ethylenically unsaturated compounds with (meth)acryloxy and —O—P(O)(OH)x groups linked by hydrocarbon groups, an initiator system, and a high filler content (>40% by weight), which can be applied to untreated dental surfaces without etching or priming, to provide both strong adhesion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional self-adhesive compositions are used to bond to untreated dental structures, then good adhesion is achieved, but mechanical properties (flexural modulus and compressive strength) are poor
Solution Approach 1:
The patent uses composite materials by combining hydrophilic monomers (providing adhesion through interaction with dental structure) and hydrophobic monomers (providing mechanical strength), along with fillers and initiators to create a multi-component system that achieves both good adhesion to untreated dental structures and excellent mechanical properties
Solution Approach 2:
The patent applies local quality by having different monomer components perform different functions: hydrophilic monomers concentrate at the interface with the dental structure to provide adhesion, while hydrophobic monomers form the bulk matrix providing mechanical strength, creating spatial differentiation of properties within the adhesive composition
2Strength
If conventional restorative compositions are used, then excellent mechanical properties are achieved, but separate etching and bonding steps are required (increasing process complexity)
Solution Approach 1:
The patent merges multiple functions (adhesion promoter, etchant, primer, and restorative material) into a single self-adhesive composition that can bond to untreated dental structures while providing excellent mechanical properties, eliminating the need for separate etching and bonding steps
Solution Approach 2:
The patent creates a universal composition that performs multiple functions simultaneously: the hydrophilic monomers provide etching and priming action, the hydrophobic monomers provide structural strength, and the filler provides mechanical reinforcement, allowing one material to replace multiple traditional materials and steps
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 effectively bonds to untreated dental structures, offering both excellent adhesion and mechanical properties, such as flexural and compressive strength, without the need for separate etching or priming steps.
Implementation Method 1
an initiator system; and a filler wherein the self-adhesive composition includes at least 40% by weight filler
Implementation Method 2
self-adhesive compositions that can bond to an untreated dental structure (i.e., a structure not pre-treated with an etchant, primer, or bonding agent)
Data Source
AI summary
The present invention provides self-adhesive compositions that include a plurality of acidic compounds. The self-adhesive compositions are useful for applications including, for example, restoring dental structures and adhering orthodontic appliances to teeth.