Fluorapatite-Polyacrylic Acid Sheet for Dental Restoration
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Solution Overview
Problem
Current dental restorations using metals, ceramics, or polymers for enamel replacement face issues such as material incompatibility, stress-induced microleakage, and limited antibacterial efficacy, necessitating the development of an enamel-like structure with improved mechanical properties and sustainable antibacterial activity.
Innovation Solution
A composition of fluorapatite (FAP) and low-molecular-weight polyacrylic acid (LPAA) is used to create an enamel-like structure with enhanced mechanical properties and antibacterial activity, forming a prism-like structure that inhibits bacterial proliferation, including the ability to kill Streptococcus mutans within 12 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials (metals, ceramics, polymers) are used for enamel replacement, then the restoration can be fabricated, but material incompatibility and stress-induced microleakage occur
Solution Approach 1:
The patent applies homogeneity by creating an enamel-like structure with a homogeneous prism-like crystal structure that closely mimics the microstructure of natural enamel. The fluorapatite crystals are arranged in a prismatic pattern with organic matrix, achieving compositional and structural homogeneity with native enamel, thereby eliminating material incompatibility and stress-induced microleakage issues associated with heterogeneous conventional materials.
Solution Approach 2:
The patent employs composite materials by combining fluorapatite crystals with an organic matrix (polyacrylic acid) to create a composite structure that replicates the composite nature of natural enamel. This composite approach allows the material to exhibit both the mineral strength of fluorapatite and the biological compatibility of the organic component, resolving the incompatibility issues of purely inorganic materials.
2Reliability
If enamel-like hydroxyapatite is regenerated onto demineralized enamel surface, then early caries lesions can be recovered, but the process is onerously time-consuming and impractical at clinical level
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters - specifically using fluorapatite instead of hydroxyapatite and adjusting the crystal structure to prism-like morphology. This compositional parameter change accelerates the regeneration process and makes it clinically feasible, while maintaining the enamel regeneration capability.
Solution Approach 2:
The patent replaces the slow biological mineralization process with a controlled chemical deposition process that forms fluorapatite crystals directly on the demineralized enamel surface. This substitution of the mineralization mechanism dramatically reduces the time required for enamel regeneration, making it practical for clinical application.
3Object-affected harmful factors
If antibacterial agents are applied on tooth surface, then bacterial activity can be inhibited, but the activity is buffered by saliva and reduced by tooth brushing or antibiotic resistance
Solution Approach 1:
The patent applies self-service by incorporating antibacterial properties directly into the enamel-like structure itself, rather than relying on separate applied agents. The fluorapatite-prism structure inherently provides antibacterial activity, allowing the material to protect against bacteria autonomously without being affected by saliva buffering or brushing mechanisms.
Solution Approach 2:
The patent uses composite materials by integrating antibacterial functionality into the fluorapatite-prism composite structure. The combination of fluorapatite crystals with specific surface properties and the organic matrix creates a composite material that maintains sustained antibacterial efficacy despite the presence of saliva or mechanical brushing, overcoming the limitations of conventional applied antibacterial agents.
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 FAP-LPAA composition effectively mimics the mechanical properties of natural enamel, provides sustained antibacterial activity, and is safe for human use, addressing compatibility and efficacy issues in dental restorations.
Implementation Method 1
evaporation strategy generated antibacterial enamel-like fluorapatite-polyacrylic acid sheet
Implementation Method 2
evaporation triggered deposition
Implementation Method 3
improve the mechanical properties of enamel-like structure via the bonding effect among the adjacent crystals by carboxy group
Data Source
AI summary
The subject invention pertains to an evaporation strategy combined with low-molecular-weight polyacrylic acid (LPAA) to generate an antibacterial dental enamel-like structure. Polystyrene (PS) plates can be used as a removable substrate for the continuous growth of fluorapatite (FAP). The FAP-LPAA composition can be used to kill microorganisms. The LPAA contained dental enamel-like FAP provides an alternative to prevent secondary caries if a carious cavity is filled with shaped dental enamel-like FAP-LPAA.