Self-Adhesive Dental Composition with Ascorbic Acid Redox System
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Solution Overview
Problem
Current dental composites require pre-treatment of the tooth surface for adhesion, which is complex and time-consuming, and existing redox initiator systems do not perform well under acidic conditions, leading to insufficient cure and mechanical properties compared to photoinitiated systems.
Innovation Solution
A two-component self-adhesive composition comprising ascorbic acid or its derivatives, an oxidizing agent, and a transition metal component, which allows for efficient curing under acidic conditions, providing good adhesion to both enamel and dentin with improved mechanical properties, and can be dual-curable with a photoinitiator system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-treatment of tooth surface by bonding agent is used to achieve adhesion, then adhesion to enamel and dentin is improved, but procedure complexity and time consumption increase
Solution Approach 1:
The patent combines the bonding agent and cement into a single self-adhesive composition that performs both adhesion and cementation functions simultaneously, eliminating the need for separate bonding agent application and light-curing steps
Solution Approach 2:
The self-adhesive composition serves multiple functions: it acts as both the bonding agent and the cement, providing adhesion to both enamel and dentin while also serving as the restorative material, thereby simplifying the overall procedure
2Ease of operation
If redox initiator system is used for self-curing, then ease of operation is improved, but curing efficiency and mechanical properties deteriorate under acidic conditions
Solution Approach 1:
The patent modifies the redox initiator system by selecting specific components (ascorbic acid or derivatives combined with peroxides) that maintain effectiveness under acidic conditions, changing the chemical parameters to achieve both self-curing and adequate mechanical properties
Solution Approach 2:
The patent creates a composite curing system that combines redox initiation with photoinitiation, allowing the material to benefit from both self-curing ease of operation and light-curing mechanical strength, effectively combining advantages of both approaches
3Ease of operation
If self-adhesive composition is used to eliminate pre-treatment, then ease of operation is improved, but adhesion reliability may worsen
Solution Approach 1:
The patent adjusts the pH and chemical composition parameters of the self-adhesive system to ensure effective adhesion to both enamel and dentin without pre-treatment, optimizing the balance between ease of use and adhesion reliability
Solution Approach 2:
The self-adhesive composition acts as an intermediary that chemically interacts with both the tooth structure and the restorative material, creating reliable bonds without requiring separate bonding agent 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 efficient self-curing and self-adhesion to enamel and dentin with mechanical properties comparable to photoinitiated systems, eliminating the need for pre-treatment and ensuring stable, strong bonds to various dental materials without chemical pre-treatment.
Implementation Method 1
a redox initiator system comprising ascorbic acid or derivatives thereof, peroxide and transition metal component
Implementation Method 2
an optional photoinitiator system to provide dual-cure compositions
Data Source
AI summary
The present invention relates to a kit of parts comprising Part A and Part B, Part A comprising: ascorbic acid, component(s) comprising an ascorbic acid moiety or derivative(s) thereof, optionally polymerizable component(s) without acidic moieties, optionally polymerizable component(s) with acidic moieties, and optionally filler(s), Part B comprising polymerizable component(s) without acidic moieties, polymerizable component(s) with acidic moieties, transition metal component(s), organic peroxide(s), and optionally filler(s), The invention is also directed to a redox initiator system comprising ascorbic acid, component(s) comprising an ascorbic acid moiety or derivative(s) thereof, transition metal component(s), preferably comprising a copper or iron ion containing salt, organic peroxide(s), preferably comprising a hydroperoxide or di-peroxide. The kit of parts and redox initiator system are particularly useful in the dental field.