Stabilized Dental Polysiloxane Composition with Phosphite Antioxidants

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Solution Overview

Problem

Dental impression materials, particularly hydrophilic polysiloxane-based ones, face challenges with storage stability and shelf-life, as they tend to prematurely cure due to high surfactant levels and adverse effects from fillers with low pH values, leading to viscosity increases and reduced stability.

Innovation Solution

A dental composition comprising a curable organopolysiloxane polymer, crosslinker, catalyst, hydrophilizing agent, filler (cristobalite), and stabilizers with phosphite and antioxidant moieties, which are physically separated into base and catalyst pastes to maintain stability and prevent premature curing, allowing for extended storage and improved hydrophilicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If hydrophilic surfactants are added to improve wettability, then hydrophilicity is improved, but storage stability deteriorates due to premature curing

Engineering Contradiction:

Improvestorage stabilityVSAvoidhydrophilicity

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

A stabilizer compound is introduced as an intermediary substance that specifically inhibits the premature crosslinking reaction between the polysiloxane and surfactant. The stabilizer acts as a mediator that prevents direct harmful interaction between these components during storage, allowing the formulation to maintain both high surfactant content for hydrophilicity and stability during storage. The stabilizer is consumed during storage to prevent curing, and the material is intended to be used within a specific time frame before the stabilizer is depleted.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If fillers with low pH values are used, then cost and availability are improved, but storage stability deteriorates due to adverse effects on the composition

Engineering Contradiction:

Improvefiller availabilityVSAvoidstorage stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The stabilizer compound is designed to specifically counteract the harmful effects of low pH fillers. The stabilizer's chemical structure and properties are selected to neutralize or mitigate the adverse interactions between acidic fillers and the polysiloxane-surfactant system. This allows the use of cost-effective, readily available fillers with low pH values while maintaining storage stability through the protective action of the stabilizer.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Duration of action of stationary object

If the composition is stored for extended periods, then shelf-life is extended, but viscosity increases due to premature curing

Engineering Contradiction:

Improveshelf-lifeVSAvoidviscosity stability

Core Design Contradiction:

Duration of action of stationary objectVSStability of the object's composition

Solution Approach 1:

The stabilizer compound transforms the potentially harmful premature crosslinking reaction into a controlled, time-limited protective mechanism. By sacrificing the stabilizer over time, the system extends the usable shelf-life of the material while maintaining stable viscosity characteristics. The stabilizer's gradual consumption provides a predictable extension of storage stability, allowing the material to be stored for extended periods without significant viscosity increase, within the intended time frame.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 exhibits enhanced storage stability, maintaining hydrophilicity and preventing viscosity increases, ensuring the material's properties remain unchanged even with low pH fillers, thus extending shelf-life and ensuring consistent performance.

Implementation Method 1

a stabilizer compound for use in a curable polysiloxane composition comprising a curable polysiloxane and a hydrophilic surfactant, wherein the stabilizer compound prevents premature crosslinking of the curable polysiloxane with the surfactant during storage

Methodology Applied

Scientific EffectChemical stabilization:

Implementation Method 2

a curable polysiloxane composition comprising a curable polysiloxane and a hydrophilic surfactant... capable of crosslinking the curable polysiloxane

Methodology Applied

Scientific EffectCrosslinking reaction: Chemical Bonding

Data Source

PatentEP2958538B1Stabilized dental impression composition, kit of parts and use thereof

Publication Date: 2020.04.29 3M INNOVATIVE PROPERTIES CO

AI summary

The invention is related to a dental impression composition which is curable at a temperature below about 50C, the composition comprising: (A) a curable organopolysiloxane polymer as component (A), (B) a crosslinker compound capable of crosslinking said organopolysiloxane polymer as component (B), (C) a catalyst as component (C) capable of catalyzing a crosslinking reaction of component (A) and component (B), (D) a hydrophilizing agent as component (D), (E) a filler as component (E), (F1) a stabilizer as component (F1) selected from compounds comprising a phosphite moiety and mixtures thereof, (F2) a stabilizer as component (F2) selected from antioxidants and mixtures thereof, the composition being present in the form of a base paste and a catalyst paste physically separated from another, the base paste comprising components (A), (B), (D), (E), (F1), (F2), the catalyst paste comprising components (A), (C), (E).