Self-Adhering Dental Composite with Sulfate Stabilizers
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Solution Overview
Problem
Dental composites with acidic adhesive monomers have limited storage stability due to detrimental interactions with fillers, leading to reduced adhesive properties and difficulty in using double-push syringes for mixing.
Innovation Solution
Incorporating water-soluble sulfates or phosphates, such as ammonium sulfate or potassium phosphate, in combination with fluoroaluminosilicate glass fillers and radiopaque glass fillers, to enhance storage stability and self-adhesive properties, allowing for easy mixing as 2-component systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acidic adhesive monomers are used to achieve self-adhesive properties, then adhesion to enamel/dentin is improved, but storage stability deteriorates due to detrimental interactions with fillers
Solution Approach 1:
Water-soluble sulfates or phosphates are introduced as intermediary substances that mediate between the acidic adhesive monomers and filler particles. These intermediaries prevent direct detrimental interactions by forming soluble complexes, thereby maintaining both adhesive properties and storage stability simultaneously.
Solution Approach 2:
The chemical composition parameters of the resin matrix are modified by adding water-soluble sulfates or phosphates. This parameter change alters the chemical environment to prevent insoluble salt formation while preserving the acidic monomer's adhesive functionality, resolving the contradiction between adhesion and storage stability.
2Reliability
If redox initiator systems are used to ensure adequate curing, then polymerization is improved, but storage stability deteriorates due to acid-induced impairment of radical formation
Solution Approach 1:
Water-soluble sulfates or phosphates act as protective intermediaries for the redox initiator system. They mitigate the harmful effects of acidic adhesive monomers on radical formation while allowing the redox system to function effectively for curing, thus maintaining both storage stability and curing effectiveness.
3Duration of action of stationary object
If 2-component systems are used to ensure storage stability of redox initiators, then shelf life is improved, but ease of operation deteriorates due to mixing complexity
Solution Approach 1:
The redox initiator components are extracted into separate containers within the dual-cartridge system, allowing each component to be stored stably independently. The device architecture enables simple simultaneous dispensing and mixing without requiring complex manual mixing procedures, thus maintaining both shelf life and ease of operation.
4Strength
If filler content is increased to improve mechanical properties, then strength is improved, but transparency deteriorates
Solution Approach 1:
The refractive index parameters of the filler particles are optimized to match the resin matrix more closely. This parameter change reduces light scattering at filler-matrix interfaces, allowing higher filler content to be used while maintaining improved transparency alongside enhanced mechanical properties.
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 compositions exhibit improved storage stability, transparency, and self-adhesion to enamel/dentin, making them suitable for dental luting cements and other dental applications, with enhanced mechanical properties and ease of use with double-push syringes.
Implementation Method 1
at least one sulfate and/or phosphate which is water-soluble at 20° C.
Implementation Method 2
at least one fluoroaluminosilicate glass filler and/or radiopaque glass filler
Implementation Method 3
strongly acidic adhesive monomers are used, such as 10-methacryloyloxydecyl dihydrogen phosphate (MDP), which etches the hard tooth structure and causes adhesion to enamel/dentin through ionic relationships
Implementation Method 4
Methacrylate-based dental materials are hardened by radical polymerization, using radical photoinitiators, thermal initiators or redox initiator systems
Implementation Method 5
Redox initiator systems are usually used which are based on a mixture of dibenzoyl peroxide (DBPO) with tertiary aromatic amines
Data Source
Figure 1
AI summary
Radically polymerizable composition containing at least one acidic, radically polymerizable monomer, at least one fluoroaluminium silicate glass filler and/or radiopaque glass filler and at least one water-soluble sulfate and/or phosphate.