Two-Paste Dental Curable Composition for Lithium Disilicate Bonding
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Solution Overview
Problem
Existing dental curable compositions struggle to achieve clinically acceptable bond durability to lithium disilicate-containing glass ceramic restorations without using conventional primers, and silane treatments do not effectively enhance bond durability.
Innovation Solution
A two-paste dental curable composition is developed, comprising a silane coupling agent with a specific structure, a polymerizable monomer with an acid group, and other components, which eliminates the need for conventional primers and enhances bond durability to lithium disilicate glass ceramic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silane treatment is applied to lithium disilicate glass, then chemical adhesion is achieved, but bond durability remains insufficient
Solution Approach 1:
The patent combines multiple adhesion mechanisms (mechanical interlocking through surface roughening and chemical adhesion through silane coupling) into a single integrated treatment process. The silane coupling agent is applied to create both surface roughness for mechanical interlocking and chemical bonding groups for adhesion, eliminating the need for separate primer and adhesive application steps.
Solution Approach 2:
The invention uses a composite approach by combining the silane coupling agent with specific resin components that provide both mechanical interlocking capability and chemical bonding functionality. The adhesive composition includes silane-treated particles and polymerizable monomers that work together to achieve durable bonding to lithium disilicate glass without requiring additional primer layers.
2Strength
If primer treatment is used to achieve adhesion, then bond strength is improved, but operation complexity increases
Solution Approach 1:
The silane coupling agent serves multiple functions simultaneously: it creates surface roughness for mechanical interlocking, provides chemical bonding groups for adhesion, and acts as a primer-like layer. This multi-functionality eliminates the need for separate primer treatment steps while maintaining bond strength.
Solution Approach 2:
The patent extracts the essential adhesion-promoting functions from the conventional multi-step primer process and integrates them into a single silane coupling agent application. The silane treatment provides both the surface modification and chemical bonding capabilities that would otherwise require separate primer and adhesive steps.
3Reliability
If mechanical interlocking is achieved through surface roughening, then bond durability is improved, but treatment complexity increases
Solution Approach 1:
The patent merges the surface roughening function and chemical adhesion function into a single silane coupling agent treatment. The silane application simultaneously creates mechanical interlocking surfaces and provides chemical bonding groups, eliminating the need for separate mechanical roughening and chemical treatment 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 achieves clinically acceptable bond durability to dental glass ceramic restorations, including lithium disilicate-containing ones, without the need for primers, simplifying the adhesion process and maintaining bond strength over time.
Implementation Method 1
a silane coupling agent having a specific structure
Implementation Method 2
curable resin compositions composed of a radical polymerizable monomer, polymerization initiator, etc.
Implementation Method 3
the chemical adhesion achieved by a silane coupling agent
Data Source
AI summary
The present invention provides a two-paste dental curable composition achieving clinically acceptable bond durability to dental adherends including dental glass ceramic restorations (particularly lithium disilicate-containing glass ceramic restorations) without using conventionally used primers. The present invention relates to a two-paste dental curable composition comprising: a first agent comprising a polymerizable monomer (a) having an acid group, a polymerizable monomer (b) having no acid group, a polymerization initiator (c), and a filler (d); and a second agent comprising a polymerizable monomer (b) having no acid group, at least one filler (e) selected from the group consisting of a basic glass filler and alumina, a polymerization accelerator (f), and a silane coupling agent (g) represented by the following general formula [I]: (The definitions of the symbols are omitted.)