Nanoparticle Deposition on Roughened Dental Implant Surfaces
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Solution Overview
Problem
Existing dental implant coating techniques, such as plasma spraying, have high dissolution rates and poor adherence of calcium phosphate compounds like hydroxyapatite (HA) to metal implants, leading to inadequate osseointegration and potential fractures.
Innovation Solution
A method involving surface roughening of dental implants to create microscale and nanoscale irregularities, followed by a one-step deposition of hydroxyapatite nanocrystals using a colloidal solution in 2-methoxyethanol, without the need for pretreatment, to enhance osseointegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plasma spraying or sputtering is used to deposit calcium phosphate coating on implant, then coating can be formed on implant surface, but the dissolution rate of HA is undesirably high and bond strength between implant and compound is insufficient
Solution Approach 1:
The patent changes the particle size parameter of calcium phosphate from conventional micrometer scale to nanoscale (1-100 nm), which fundamentally alters the dissolution rate and bonding characteristics. The nanoscale particles exhibit slower dissolution rates while maintaining strong bond strength to the implant surface, resolving the contradiction between bond strength and compositional stability.
Solution Approach 2:
The patent creates a composite structure by depositing nanoscale calcium phosphate particles onto a roughened implant surface, forming a hierarchical composite material system. The combination of microscale surface roughness with nanoscale particle deposition produces a composite structure that simultaneously achieves high bond strength and controlled dissolution rate.
2Reliability
If plasma spraying or sputtering is used to deposit calcium phosphate coating, then coating is formed, but the interface of HA and implant is prone to fracture due to poor adherence
Solution Approach 1:
The patent changes the surface topology parameter by creating microscale roughness (peaks and valleys) on the implant surface before particle deposition. This surface modification dramatically improves adherence of nanoscale calcium phosphate particles, preventing interface fracture while maintaining coating integrity.
Solution Approach 2:
The patent introduces a hierarchical structure with microscale surface features and nanoscale particle deposition, adding dimensional complexity to the coating system. The multi-scale architecture (microroughness + nanoparticulate coating) creates mechanical interlocking that prevents fracture at the implant-coating interface.
3Reliability
If existing nanoparticle deposition method is used, then HA nanoparticles can be deposited, but the process requires hazardous chemicals and produces hazardous byproducts
Solution Approach 1:
The patent extracts and removes the hazardous chemical components (alkoxides, tri-functional silanes) from the deposition process. The new method uses only aqueous or alcoholic solutions of calcium phosphate nanoparticles, eliminating the need for hazardous precursors and their associated harmful byproducts while maintaining effective particle deposition.
Solution Approach 2:
The patent converts the previously harmful chemical deposition process into a benign physical deposition process. By using simple suspension deposition instead of chemical vapor deposition or sol-gel methods, the process transforms from one requiring hazardous chemicals to one using safe, environmentally friendly solutions.
4Reliability
If existing nanoparticle deposition method is used, then HA coating can be formed, but the process is inefficient as it requires multiple coating layers
Solution Approach 1:
The patent merges multiple deposition steps into a single-step process. Instead of requiring a first layer of alkoxide/silane followed by a second layer of HA nanoparticles, the method directly deposits calcium phosphate nanoparticles in one operation, significantly improving process efficiency while maintaining coating quality.
Solution Approach 2:
The patent performs preliminary surface roughening of the implant before particle deposition, creating an optimized substrate that enables direct, effective particle adhesion. This preliminary surface preparation eliminates the need for intermediate chemical layers, streamlining the overall process into a single efficient deposition step.
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
This approach improves the bond strength and biostability of the implant surface, reducing the risk of fractures and enhancing long-term osseointegration by creating a stable and uniform array of microscale irregularities with permanently formed nanostructures.
Implementation Method 1
depositing discrete nanoparticles on the microscale roughened surface though a one-step process of exposing the nanoscale roughened surface to a solution including the nanoparticles
Data Source
AI summary
A method of forming an implant to be implanted into living bone is disclosed. The method includes the act of roughening at least a portion of the implant surface to produce a microscale roughened surface. The method further includes forming a nanoscale roughened surface on the microscale roughened surface. The method further includes the act of depositing discrete nanoparticles on the nanoscale roughened surface though a one-step process of exposing the roughened surface to a solution including the nanoparticles. The nanoparticles have a material having a property that promotes osseointegration.