Zinc Oxide Trimethylglycine Complex for Dental Erosion Protection
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Solution Overview
Problem
Current dental care products with zinc oxide have limited solubility and solubilization issues, leading to ineffective delivery of zinc ions, unpleasant taste and mouthfeel, and interference with foaming and cleaning agents, while also failing to provide sustained protection against dental erosion and sensitivity.
Innovation Solution
A soluble complex of zinc oxide with N,N,N-trimethylglycine (TMG) is formed, which provides effective zinc ion delivery, reduces sensitivity by plugging dentinal tubules, and forms a coating on teeth that enhances substantivity and controlled release of actives, avoiding the limitations of conventional zinc-based products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soluble zinc salts are used to provide effective zinc ion concentration, then zinc delivery effectiveness is improved, but unpleasant astringent mouthfeel and interference with anionic surfactants occur
Solution Approach 1:
The patent uses zinc oxide as an intermediary substance that does not directly dissolve to release zinc ions in the formulation, but instead forms a coating on dental surfaces that subsequently releases zinc ions. This intermediary approach avoids the direct contact between soluble zinc salts and the oral environment, thereby eliminating unpleasant astringent mouthfeel while preventing interference with anionic surfactants like SLS.
Solution Approach 2:
The patent changes the solubility parameter of zinc by using zinc oxide in combination with specific pH buffers and chelating agents. The zinc oxide is maintained in a controlled solubility state during storage, then releases zinc ions in a controlled manner when applied to dental surfaces, transforming from a completely soluble salt to a controlled-release system.
2Stability of the object's composition
If zinc oxide is used in conventional powder form, then solubility issues are avoided, but strong affinity toward dental surfaces is lacking and zinc is washed away
Solution Approach 1:
The patent merges zinc oxide with toothpaste base components including surfactants, humectants, and flavorings to create a unified composition. The zinc oxide particles are distributed throughout the toothpaste matrix, allowing them to be delivered to dental surfaces in a controlled manner during brushing, thereby achieving both stability and surface affinity.
Solution Approach 2:
The patent applies zinc oxide in preliminary form as a fine powder dispersed in the toothpaste base before application. This preliminary distribution ensures uniform coverage and maximizes surface contact area, enabling the zinc oxide to adhere to dental surfaces effectively before being rinsed away, thereby achieving sustained release of zinc ions.
3Reliability
If zinc oxide solubility is increased to improve zinc ion delivery, then antimicrobial and anti-erosion efficacy is improved, but taste and mouthfeel deterioration occurs
Solution Approach 1:
The patent employs the toothpaste base components as intermediaries that facilitate zinc ion delivery from zinc oxide without direct contact between high concentrations of zinc ions and the oral environment. The surfactants and chelating agents in the base act as mediators to control the release and transport of zinc ions, maintaining efficacy while avoiding unpleasant taste and mouthfeel.
Solution Approach 2:
The patent modifies the release kinetics parameter of zinc oxide by adjusting pH, ionic strength, and chelating agent concentration in the formulation. These parameter changes enable controlled, sustained release of zinc ions that maintains effective concentrations at the dental surface without creating unpleasant sensory experiences during application and rinsing.
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 zinc-TMG complex effectively protects against dental erosion, reduces bacterial colonization, provides enhanced shine, and offers sustained antimicrobial and anti-sensitivity benefits without the taste and mouthfeel issues of traditional zinc products.
Implementation Method 1
zinc oxide can form a soluble complex with TMG in both its free form and acid addition form
Implementation Method 2
the formulation provides a precipitate which can plug the dentinal tubules, thereby reducing the sensitivity of the teeth
Implementation Method 3
the zinc oxide that can be effectively delivered as soluble species is limited in quantity
Data Source
AI summary
Described herein are oral care compositions comprising a mixture of zinc oxide and trimethylglycine, in free or orally acceptable salt form. Methods of making and using the compositions are also provided.