Dual-Cure Dental Composition for Stable Curing Without Discoloration

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Solution Overview

Problem

Existing dental compositions face challenges in achieving fast curing kinetics while maintaining storage stability without discoloration, as high amounts of stabilizers used to prevent premature polymerization can lead to undesirable discoloration.

Innovation Solution

A dual-cure dental composition comprising a Base Part and a Catalyst Part, with specific components including polymerizable components, fillers, transition metal components, and stabilizers with free-radical moieties, such as phosphite or sulfite, to stabilize the initiator system and prevent discoloration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high amounts of stabilizers are used to prevent premature polymerization, then storage stability is improved, but discoloration occurs

Engineering Contradiction:

Improvestorage stabilityVSAvoiddiscoloration

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The stabilizer system is segmented into two distinct parts: a phosphite stabilizer (in the base paste) and a sulfite stabilizer (in the catalyst paste). This segmentation allows each stabilizer to perform its specific function optimally while preventing the harmful interaction that causes discoloration. The phosphite stabilizer prevents premature polymerization of the base resin, while the sulfite stabilizer protects the catalyst components, and together they maintain color stability without requiring high amounts of a single stabilizer type.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite stabilizer system combining phosphite and sulfite stabilizers in specific proportions (phosphite: 0.01-5 wt%, sulfite: 0.01-5 wt%). This composite approach leverages the complementary properties of both stabilizer types to achieve superior storage stability and color retention compared to using either stabilizer alone, resolving the contradiction between stability and discoloration prevention.

Inventive Principle:

Principle #40Composite materials

2Productivity

If fast curing kinetics are achieved, then productivity is improved, but storage stability deteriorates

Engineering Contradiction:

Improvecuring speedVSAvoidstorage stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The initiator system is divided into two separate pastes that do not interact during storage: the base paste contains polymerizable monomers/oligomers with minimal initiators, while the catalyst paste contains the dormant initiator and accelerators. This segmentation prevents premature polymerization during storage (maintaining stability) while enabling fast curing kinetics upon mixing (improving productivity). The physical separation allows each component to remain stable until the moment of use.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base paste is prepared in advance with all necessary polymerizable components and stabilizers, but without active initiators. The catalyst paste is separately prepared with dormant initiators and accelerators. This preliminary preparation allows both pastes to be stored stably for extended periods, and when mixed, the pre-positioned components immediately engage in rapid polymerization, achieving both storage stability and fast curing.

Inventive Principle:

Principle #10Preliminary action

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 fast and secure curing with improved storage stability and appropriate physical properties, such as flexural strength and E-modulus, without significant discoloration.

Implementation Method 1

stabilizer component(s) comprising a free-radical moiety

Methodology Applied

Scientific EffectFree-radical moiety stabilization:

Implementation Method 2

stabilizer component(s) comprising a phosphite or sulfite moiety

Methodology Applied

Scientific EffectPhosphite stabilization:

Implementation Method 3

stabilizer component(s) comprising a phosphite or sulfite moiety

Methodology Applied

Scientific EffectSulfite stabilization:

Implementation Method 4

polymerizable component(s)

Methodology Applied

Scientific EffectPolymerization:

Data Source

PatentUS12577340B2Storage stable two-component dual cure dental composition

Publication Date: 2026.03.17 SOLVENTUM INTELLECTUAL PROPERTIES CO

AI summary

The invention relates to a two-part dual cure dental composition with improved stability toward discoloration and premature polymerization. The dental composition comprises a Base Part and a Catalyst Part, the Base Part comprising polymerizable component(s) without an acidic moiety, optionally polymerizable component(s) with an acidic moiety, filler(s), transition metal component(s), peroxide component(s), stabilizer component(s) comprising a free-radical moiety, the Catalyst Part comprising polymerizable component(s) without an acidic moiety, filler(s), ascorbic acid component, photo-initiator system, stabilizer component(s) comprising a phosphite or sulfite moiety. The dental composition is in particular useful as bulk fill dental composite, dental resin cement, core build-up dental material or self- and dual cure dental adhesive. The invention further relates to an initiator system and the use of a stabilizer comprising a free-radical moiety.