Cationically Hardenable Dental Composition with Reactive Filler
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Solution Overview
Problem
Dental impression materials face challenges in achieving improved tensile strength and viscosity behavior, particularly when increasing filler content, which can lead to increased viscosity and consistency issues during mixing, affecting handling and production costs.
Innovation Solution
A cationically curable dental composition comprising a cationically hardenable compound with aziridino groups, an initiator, and a filler with polar moieties on its surface, such as amino-silane or epoxy-silane groups, is developed to enhance tensile strength and maintain desired viscosity behavior, allowing for higher filler content without compromising rheological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of filler is increased to lower production costs and improve tensile strength, then tensile strength is improved, but viscosity and consistency increase making mixing difficult
Solution Approach 1:
The patent changes the chemical parameters of the filler by introducing reactive moieties (amino groups, epoxy groups, or aziridino groups) on the filler surface. This chemical modification allows the filler to participate in the crosslinking reaction, enabling higher filler loads (up to 80 wt% or more) without excessive viscosity increase, as the reactive surface groups interact chemically with the polymer matrix during curing.
Solution Approach 2:
The patent creates a composite material system where the filler is not merely inert particulate but chemically integrated into the polymer network. The reactive filler surface forms covalent bonds with the polymer chains, creating a synergistic composite that achieves both high tensile strength and manageable rheology through the combined properties of the polymer matrix and crosslinked filler network.
2Ease of manufacture
If the amount of filler is increased to reduce production costs, then production costs are reduced, but viscosity increases affecting handling properties
Solution Approach 1:
The patent modifies the filler parameters by adding reactive surface groups that chemically interact with the polymer matrix. This chemical activation of the filler surface reduces the filler-polymer interfacial tension and improves wetting, allowing high filler content to be incorporated while maintaining acceptable viscosity and handling characteristics during application.
3Strength
If conventional fillers are used, then production costs are low, but tensile strength is insufficient and viscosity behavior is poor
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the filler from inert to reactive by introducing functional groups (amino, epoxy, or aziridino) on the filler surface. This transformation enables the filler to actively participate in the crosslinking chemistry, significantly enhancing tensile strength and allowing higher filler content to be utilized effectively in the composition.
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 improved tensile strength and reduced viscosity in the uncured state, enabling higher filler content without increasing viscosity, thus reducing production costs and maintaining desired handling properties, with enhanced shelf life and reduced gas bubble formation.
Implementation Method 1
a cationically hardenable compound having on average at least 2 aziridino groups or more... component (B) comprising an initiator being able to initiate the hardening reaction of the cationically hardenable
Data Source
AI summary
The invention relates to a hardenable dental composition comprising component (A) comprising a cationically hardenable compound, component (B) comprising an initiator being able to initiate the hardening reaction of the cationically hardenable compound, and component (C) comprising a filler, wherein the filler comprises a filler body and a filler surface, the filler surface comprising side groups with polar moieties. The invention also relates to a process of producing the dental composition, to the use of the dental composition as dental impression material and to a method of taking an impression of dental tissue.