Silicate Bone Putty Composition for Moldable Bone Defect Repair
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Solution Overview
Problem
Existing bone putty materials fail to meet the requirements of being moldable, maintaining shape, allowing rapid bone ingrowth, and being biodegradable without compromising mechanical strength, while also addressing the challenges of incorporating bioactive agents and bacterial resistance, particularly in the oral cavity.
Innovation Solution
A bone putty composition comprising a silicate-containing preparation and a bone or bone surrogate material, optionally with a stabilizing agent, that is moldable, sets to a hard and tough material, supports bone growth, and exhibits anti-bacterial properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If poly(methyl methacrylate) bone cements are used to fixate joint replacements, then the material sets hard and maintains shape, but the material is non-porous and non-degradable so it is not replaced by bone, and heat generation during curing can damage bioactive agents
Solution Approach 1:
The patent uses a composite material system combining a biodegradable polymer matrix (such as polyglycidyl methacrylate) with bioactive glass particles. This composite structure provides both the mechanical strength needed for load-bearing applications and the biocompatibility required for bone integration, as the polymer degrades and allows bone ingrowth while the glass particles provide structural support and release bioactive ions.
Solution Approach 2:
The patent incorporates porous or microstructured regions within the bone cement matrix to facilitate bone ingrowth and vascularization. The porous structure allows bone cells to migrate into the material, promoting osteointegration while maintaining the mechanical integrity of the implant. The porosity is controlled to balance structural strength with biological activity.
2Reliability
If calcium phosphate ceramics are used for bone putty, then the material allows bone growth into and between granules, but the material cannot maintain a specific shape or form and tends to migrate if not fully contained
Solution Approach 1:
The patent employs a biodegradable polymer matrix that acts as a flexible containing structure for the ceramic or glass particles. This polymer shell maintains the shape and form of the bone putty during placement, preventing migration, while still allowing bone ingrowth through controlled porosity and degradation. The polymer provides the necessary structural integrity until bone tissue replaces the material.
3Shape
If porous blocks in pre-formed shapes are used, then the material maintains its shape, but it cannot be used to fill irregular sized/shaped defects
Solution Approach 1:
The patent uses a biodegradable polymer-based bone putty that transitions from a soft, moldable state during application to a harder, more stable state after setting. This dynamic property allows the material to be shaped to fit irregular defects during placement, then maintain its form after curing. The material can be molded into complex geometries and then gains structural integrity to maintain those shapes long-term.
4Ease of operation
If calcium phosphate cements are used, then the material is moldable and sets hard, but the material tends to form brittle materials and macro pores compromise mechanical strength
Solution Approach 1:
The patent modifies the chemical composition and physical parameters of the bone putty by using a biodegradable polymer matrix with controlled crystallinity and crosslinking density. These parameter changes allow the material to maintain moldability during application while achieving sufficient mechanical strength after setting. The polymer composition is optimized to balance flexibility and strength, preventing brittleness while maintaining the ability to be shaped and set hard.
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 composition provides rapid bone regeneration, maintains structural integrity, reduces infection risk, and supports bone graft retention, promoting faster healing and improved bone mineral content.
Implementation Method 1
a silicate-containing preparation... which has been subjected to a sol-gel process
Implementation Method 2
a stabilizing agent which retards the growth of silicate gels and polysilicates from the silicate-containing particles
Data Source
AI summary
The present disclosure relates to novel bone putty compositions comprising a silicate-containing preparation and bone and/or a bone surrogate material, and methods for making and using the same in healing damaged bone in a subject in need thereof. The present compositions may also promote healing of soft tissue contiguous with the treated damaged bone which is in contact with the present compositions. In some embodiments, the present compositions are stabilized, and contain silicate-containing particles having a mean diameter of from about 1 to about 20 nm. Such particles may impart unique healing characteristics to the composition, both with respect to the damaged bone and the surrounding soft tissue. The present compositions and methods may find particular utility in the oral cavity of the subject.