Polysiloxane Compound for Dental Materials with Reduced Shrinkage
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Solution Overview
Problem
Polysiloxane compounds used in dental materials face issues such as increased water absorption due to hydrophilicity, leading to reduced wet strength and manageability, along with high polymerization shrinkage and viscosity, which affect the properties of curable and hardened dental materials.
Innovation Solution
A polysiloxane compound with specific siloxane units, characterized by a reduced double bond density and the presence of substituents that enhance molecular weight and hydrophobicity, maintaining good viscosity and processability while improving flexural strength and refractive index, allowing for better light curing and reduced polymerization shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxane compounds contain free polar functional groups (hydroxy or carboxy groups), then radiopacity and contact toxicity are improved, but water absorption increases leading to reduced wet strength
Solution Approach 1:
The invention extracts the harmful hydroxy groups from the polysiloxane structure through reaction with organometallic compounds, converting them into non-polar alkyl groups. This removes the source of water absorption while preserving the essential polymerizable groups needed for dental material functionality.
Solution Approach 2:
The invention changes the chemical parameter of the polysiloxane by replacing polar hydroxy groups with non-polar alkyl groups through controlled chemical reaction. This parameter change reduces hydrophilicity and water absorption, thereby improving wet strength while maintaining other desirable properties.
2Reliability
If polysiloxane compounds contain free polar functional groups, then radiopacity is improved, but viscosity increases reducing manageability
Solution Approach 1:
The invention extracts the problematic polar functional groups that cause high viscosity through reaction with organometallic compounds. By removing these groups and replacing them with non-polar alkyl groups, the viscosity is reduced to acceptable levels while radiopacity is maintained through the presence of metal atoms.
Solution Approach 2:
The invention changes the physical parameter of viscosity by modifying the chemical structure of the polysiloxane. The conversion of polar hydroxy groups to non-polar alkyl groups reduces intermolecular forces, thereby lowering viscosity and improving manageability without sacrificing radiopacity.
3Loss of substance
If polysiloxane compounds have high double bond density for polymerization, then polymerization shrinkage is reduced, but flexural strength decreases
Solution Approach 1:
The invention creates a composite structure by incorporating metal atoms (from organometallic compounds) into the polysiloxane matrix. This composite approach allows the polymerized material to achieve both low shrinkage and high flexural strength, as the metal components provide structural reinforcement while the polysiloxane matrix maintains low polymerization shrinkage.
Solution Approach 2:
The invention changes the mechanical parameters of the cured dental material by controlling the polymerization process and molecular weight of the polysiloxane. By optimizing these parameters and incorporating metal atoms, the material achieves a balance between low polymerization shrinkage and high flexural strength that cannot be achieved with conventional polysiloxanes alone.
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 polysiloxane compound achieves improved flexural strength, maintains low viscosity for better processability, and ensures excellent light curing translucency, addressing the limitations of previous compounds by providing enhanced physical properties and reduced shrinkage in dental materials.
Implementation Method 1
These organic groups often have one or more organically polymerizable groups (i.e. reactive groups) which can react with, for example, one or more organically polymerizable groups of another polysiloxane compound and thereby form crosslinked/polymerized polysiloxane compounds
Implementation Method 2
Polysiloxane compounds have been known for a long time and are available, for example, by hydrolysis and condensation of silanes with hydrolyzable groups
Implementation Method 3
ensures excellent light curing translucency
Data Source
AI summary
The present invention relates to a polysiloxane compound comprising specific siloxane units, curable dental materials comprising one or more than one polysiloxane compound according to the invention, cured dental materials obtainable from the curable dental materials according to the invention, a method for producing polysiloxane compounds according to the invention, a method for producing curable dental materials according to the invention, and a method for producing cured dental materials according to the invention.