Two-Component Tooth Desensitization Kit with Segmented Silica and Calcium Phosphate

Solution Overview

Problem

Existing tooth desensitization products require long preparation and gelation times, making them impractical for end-user application and storage, as they deteriorate within 30 days.

Innovation Solution

A two-component kit comprising a colloidal dispersion of silica particles in water and a composition of calcium phosphate glass particles, a surfactant, and an acid, which are separated to prevent premature reaction, allowing for a short gelation time and easy handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the product is prepared as a single-component paste with silica dispersion and calcium phosphate glass, then the dentine tubule occlusion effect is achieved, but the preparation time becomes too long (14 hours) and storage stability deteriorates after 30 days

Engineering Contradiction:

Improvedentine tubule occlusion effectVSAvoidpreparation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention divides the single-component paste into two separate components: (1) a colloidal silica dispersion in water, and (2) calcium phosphate glass particles with surfactant and acid. This segmentation prevents premature reaction between silica and calcium phosphate, enabling long-term storage while allowing rapid preparation (less than 2 minutes) when components are mixed before application.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the product is prepared as a single-component paste with silica dispersion and calcium phosphate glass, then the dentine tubule occlusion effect is achieved, but the product deteriorates after about 30 days making it not handleable by end users

Engineering Contradiction:

Improvedentine tubule occlusion effectVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention divides the single-component paste into two separate components: (1) a colloidal silica dispersion in water, and (2) calcium phosphate glass particles with surfactant and acid. This segmentation prevents premature reaction between silica and calcium phosphate, enabling long-term storage while allowing rapid preparation (less than 2 minutes) when components are mixed before application.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the gelation time is extended to allow proper setting, then the sealing film formation is complete, but the preparation time becomes too long (14 hours) for practical use

Engineering Contradiction:

Improvesealing film formationVSAvoidpreparation speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention changes the chemical parameters by adding surfactant and acid to the calcium phosphate glass particles. These additives catalyze the gelation process, reducing the gelation time from hours to less than 2 minutes while maintaining complete sealing film formation. The acid modifies the pH to accelerate the reaction between silica and calcium phosphate.

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If the product is prepared with all components mixed together, then the reaction proceeds smoothly, but the handling becomes difficult due to long preparation and gelation times

Engineering Contradiction:

Improvereaction smoothnessVSAvoiduser handling

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The invention divides the single-component paste into two separate components: (1) a colloidal silica dispersion in water, and (2) calcium phosphate glass particles with surfactant and acid. This segmentation prevents premature reaction between silica and calcium phosphate, enabling long-term storage while allowing rapid preparation (less than 2 minutes) when components are mixed before application.

Inventive Principle:

Principle #1Segmentation

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 kit achieves a stable, long-term storage solution with a short preparation and gelation time of less than two minutes, enhancing user convenience and product stability.

Implementation Method 1

The silica dispersion forms a dried gel layer with fine calcium phosphate glass particles that protects the dentine on the surface and occludes the dentine tubules

Methodology Applied

Scientific EffectGelation: Gel

Implementation Method 2

the addition of a surfactant and an acid, preferably an organic acid leads to a composition that after mixing of all components of the kit has a short gelation time of less than two minutes

Methodology Applied

Scientific EffectGelation: Gel

Data Source

PatentEP4494628A1Kit for preparing a composition for the desensibilisation of teeth

Publication Date: 2025.01.22 FERTON HOLDING SA

Figure 1

AI summary

The invention provides a kit for preparing a composition for the desensibilisation of teeth comprising a first component comprising a colloidal dispersion of silica particles in water, a second component being a composition, optionally presented in two or more parts, comprising calcium phosphate glass particles, a surfactant and an acid.