Ceramic Implant Surface Roughening via Green Body Particle Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic implants face challenges in achieving a rough surface for bone ingrowth due to their hard and smooth nature post-sintering, which complicates their integration into bone tissue, and existing methods to increase surface roughness often damage the fragile green or brown body during mechanical processing.
Innovation Solution
Applying sharp-edged particles made of the same material as the implant, either through a binder layer or mixed with a binder, to the surface of the green or brown compact before final sintering, eliminating the need for mechanical processing and ensuring a firm connection without stress, resulting in a roughened surface that facilitates bone ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ceramic material is used for implants to prevent showing through gums, then aesthetics are improved, but the surface remains smooth and hard making it difficult to achieve roughness for bone ingrowth
Solution Approach 1:
The invention applies surface roughening treatment to the green compact or brown compact before final sintering. At these preliminary stages, the material is much softer and more easily processed than the final sintered ceramic. The roughening can be achieved through various methods including mechanical treatment, chemical etching, or by incorporating roughening agents in the mold. This preliminary action allows the smooth, hard sintered ceramic to retain the rough surface structure without requiring complex post-sintering processing.
Solution Approach 2:
The invention changes the physical state and mechanical properties of the ceramic material by performing surface treatment at different stages of the manufacturing process. The green compact and brown compact have fundamentally different mechanical properties compared to the final sintered ceramic - they are softer, more ductile, and much easier to process. By exploiting these parameter changes during the manufacturing process, the invention achieves surface roughening that would be extremely difficult or impossible on the final hard ceramic product.
2Reliability
If mechanical processing steps are applied to sintered ceramic implants to roughen the surface, then bone ingrowth is facilitated, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The invention performs the surface roughening action at an earlier stage in the manufacturing process, specifically on the green compact or brown compact before final sintering. This preliminary roughening creates surface features that are preserved through the sintering process. Consequently, the final implant has the desired rough surface for bone ingrowth without requiring any additional mechanical processing steps after sintering, thereby simplifying the overall manufacturing process.
Solution Approach 2:
The invention combines the surface roughening step with the existing manufacturing process stages (green compact formation or brown compact preparation) rather than treating it as a separate post-processing operation. The roughening can be integrated into the injection molding process through mold surface design, or performed as a preliminary treatment before sintering. This merging of operations eliminates the need for separate mechanical processing steps on the sintered implant.
3Strength
If titanium is used for implants, then mechanical properties and biocompatibility are improved, but the implant shows through gums causing aesthetic issues
Solution Approach 1:
The invention uses ceramic materials (such as alumina or zirconia) as an alternative to titanium for implant construction. These ceramic materials provide both the necessary mechanical strength and biocompatibility while offering superior aesthetic properties due to their light color that matches natural teeth. The ceramic material does not show through the gums, eliminating the dark line appearance that occurs with titanium implants when gums recede.
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 method allows for a simple and stress-free creation of a roughened surface on ceramic implants, enhancing bone ingrowth by promoting bone abrasion during insertion and providing a firm anchoring without damaging the implant precursors, thus improving the integration of the implant into the bone.
Implementation Method 1
the surface roughness of the green body and/or the brown body is increased by a material-removing step such as erosion, sand or water blasting, laser beams, etching
Implementation Method 2
the surface roughness of the green body and/or the brown body is increased by a material-removing step such as erosion, sand or water blasting, laser beams, etching
Implementation Method 3
the additionally applied particles are baked. In this way, a firm connection is established between the base body and the applied particles
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an implant designed for incorporation in a bone and to a method for producing such an implant. The implant is a ceramic implant, which is made up of one piece or of several pieces and which is to be provided in a simple way with a roughened surface, in order to facilitate the incorporation of the implant into the bone. For this purpose, it is proposed to produce the implant in a sintering process and to already increase the surface roughness of the implant before the final sintering operation.