Silica Abrasive Particle Design for Low RDA Oral Compositions
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Solution Overview
Problem
Conventional oral compositions face a challenge in achieving a high pellicle cleaning ratio (PCR) while maintaining a low radioactive dental abrasion (RDA) value to prevent damage to dental surfaces, as increasing abrasive amounts and hardness often lead to higher RDA values without corresponding cleaning performance improvements.
Innovation Solution
The use of silica abrasives with specific particle size, hardness, and oil absorption properties that fracture under shear forces when encountering hard dental surfaces, maintaining effectiveness in cleaning and polishing while minimizing enamel or dentin abrasion, and potentially aiding in tooth sensitivity treatment by plugging tubule occlusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount and hardness of abrasives are increased to achieve higher PCR, then the cleaning performance improves, but the RDA value increases causing potential damage to enamel and dentin
Solution Approach 1:
The patent changes the physical and chemical parameters of the silica abrasive particles, specifically controlling particle size distribution (d10 of 2.5-2.9 μm, average particle size of 5-20 μm), oil absorption (80-100 cc/100g), and Einlehner hardness (6-9), to achieve optimal balance between cleaning efficacy and dental surface protection
Solution Approach 2:
The patent uses a composite abrasive system combining silica particles with specific surface properties and controlled morphology, creating a material that exhibits both high cleaning efficiency and reduced dental abrasion through the synergistic effect of particle size distribution and surface characteristics
2Productivity
If conventional abrasives are used to achieve high cleaning performance, then PCR increases, but the RDA value exceeds safe thresholds for repeated usage
Solution Approach 1:
The patent optimizes critical parameters including oil absorption (80-100 cc/100g) which controls particle-particle and particle-surface interactions, and Einlehner hardness (6-9) which determines abrasive aggressiveness, achieving a unique combination that provides high cleaning efficacy with safe RDA values (85-101)
Solution Approach 2:
The silica abrasive particles exhibit self-regulating behavior where they maintain their integrity during brushing against soft plaque and pellicle surfaces, but break down or fracture under shear forces when encountering hard enamel or dentin surfaces, thereby automatically limiting their own harmful effects
Data Source
AI summary
The present invention is directed to oral compositions comprising an orally-acceptable carrier and a silica abrasive comprising a precipitated amorphous silica compound having an average particle size of from 5 μm to 20 μm, oil absorption of from 60 cc/100 g to 120 cc/100 g, and an Einlehner hardness of from 4 to 11, and methods of use thereof