Bifunctional Peptide Coating for Peri-Implantitis-Resistant Titanium Implants

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Solution Overview

Problem

Existing dental implants face challenges with peri-implant disease due to bacterial colonization and biofilm formation, leading to reduced service life and implant failure, which impacts public health and healthcare costs, and current treatments like mechanical debridement can damage the implant surface and promote bacterial resistance.

Innovation Solution

A bifunctional peptide with a titanium-binding domain and antimicrobial activity is applied to dental implants, providing nearly 100% surface coverage, durability against brushing, and maintaining antimicrobial efficacy, effectively controlling bacterial colonization and biofilm formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If mechanical debridement is used to treat peri-implant disease, then bacterial colonization is removed, but implant surface is damaged and bacterial resistance is promoted

Engineering Contradiction:

Improvebacterial colonizationVSAvoidimplant surface integrity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent replaces mechanical debridement with a chemical/biological approach using bifunctional peptides. The peptides chemically interact with bacterial surfaces through antimicrobial domains while anchoring to titanium via titanium-binding domains, eliminating the need for mechanical scraping that damages the implant surface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The bifunctional peptide acts as an intermediary substance that mediates between the titanium implant surface and bacterial colonies. The peptide's dual functionality allows it to bridge the titanium surface and bacterial cells, delivering antimicrobial action without direct mechanical contact to the implant.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If antimicrobial peptides are applied to dental implants, then bacterial colonization is controlled, but surface coverage and binding durability must be maximized

Engineering Contradiction:

Improvebacterial colonizationVSAvoidsurface coverage and binding durability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The antimicrobial peptide is segmented into distinct functional domains: titanium-binding domains (TBDs) that anchor to the implant surface and antimicrobial domains (AMPs) that kill bacteria. This segmentation allows each domain to optimize its specific function while working together as an integrated molecule.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bifunctional peptide performs multiple functions simultaneously: it binds to titanium surfaces, maintains stability in physiological conditions, and exhibits antimicrobial activity. This multi-functionality is achieved by incorporating both TBDs and AMPs within a single peptide structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Loss of time

If rapid surface coverage is achieved for clinical application, then treatment time is reduced, but binding stability in presence of serum proteins must be maintained

Engineering Contradiction:

Improveapplication timeVSAvoidbinding stability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The titanium-binding domains are designed to preemptively and rapidly anchor to the titanium surface before serum proteins can adsorb. This preliminary action occurs within minutes of application, establishing a stable foundation before physiological competition begins.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The TBDs perform preliminary anti-action by preemptively occupying binding sites on the titanium surface, preventing serum proteins from interfering with peptide attachment. This competitive pre-binding ensures stable anchoring despite the presence of serum proteins.

Inventive Principle:

Principle #9Preliminary anti-action

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 bifunctional peptide achieves rapid and durable binding to titanium surfaces, preventing bacterial colonization and biofilm formation, thereby prolonging implant longevity and reducing the risk of peri-implant disease progression.

Implementation Method 1

nearly 100% binding to a titanium surface even in the presence of contaminating serum protein

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

antimicrobial peptides (AMPs) connected by a peptide spacer to one or more titanium-binding domains (TBDs)

Methodology Applied

Scientific EffectAmphipathic interaction: Amphiphiles

Data Source

PatentUS12533444B2Mitigation of peri-implantitis by design and stability of bifunctional peptides with antimicrobial properties

Publication Date: 2026.01.27 UNIV OF SOUTHERN CALIFORNIA

AI summary

Described herein is a bifunctional peptide, compositions comprising the same, and methods useful for treatment of peri-implant disease.