Ceramic Dental Implant Thread Segmentation
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Solution Overview
Problem
Ceramic dental implants are challenging to produce due to their high hardness, which complicates thread machining and increases the risk of stress peaks and fissures, while traditional metric threads can lead to loosening and space issues, and existing solutions for ceramic prosthetic components are cumbersome and prone to loss or swallowing during installation.
Innovation Solution
A ceramic dental implant with a non-circular inner connection seat and an internally threaded insert, along with a fixing piece and a transfixed dental prosthesis core featuring angled passages and a screwing mechanism that allows for secure attachment without threading the implant directly, reducing the risk of loosening and loss, and utilizing a snap-fit mechanism for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inner thread is machined in the ceramic implant, then the fixing screw can be secured, but the machining process becomes extremely lengthy and increases the risk of stress peaks and fissures
Solution Approach 1:
The implant system is divided into separate components: a ceramic implant body without threads and a separate internally threaded insert. The insert is screwed into the ceramic implant, providing the threading function without requiring direct thread machining of the ceramic. This segmentation allows the ceramic to be processed more easily while still achieving secure fixing screw retention.
Solution Approach 2:
The internally threaded insert acts as an intermediary element between the ceramic implant and the fixing screw. It provides the threading interface needed for secure fixation while avoiding the problematic direct thread machining of the ceramic material, thus reducing stress peaks and fissure risks.
2Adaptability or versatility
If a metric thread is used in ceramic implant, then standard fixing screws can be used, but the small radius at thread root creates stress peaks and fissure risks
Solution Approach 1:
The threading function is separated from the ceramic implant body and placed in a separate insert. This allows the use of standard metric threads in the insert (providing compatibility with fixing screws) while the ceramic implant maintains its structural integrity without small-radius thread roots that create stress concentrations.
3Strength
If a larger pitch thread is used for ceramic implant, then stress peaks are reduced, but the fixing screw may loosen more easily and more radial space is required
Solution Approach 1:
The threading is placed in a separate insert rather than the ceramic implant. This allows optimization of thread geometry in the insert for stress reduction while maintaining secure retention through the insert-ceramic interface, without the trade-off present in direct ceramic threading.
4Ease of operation
If the access well for fixing screw is positioned optimally in the mouth, then access is improved, but the location must be carefully adjusted based on patient-specific anatomy
Solution Approach 1:
The system provides universal adaptability through the non-circular cross-section design that enables rotational indexing, allowing the access well position to be adjusted to optimal locations for different patients while maintaining a standardized implant structure. The fixing piece with radial seat provides flexible positioning capability.
Data Source
AI summary
A set of components for dental prosthetic restoration includes a ceramic dental implant having an internal connecting receiving space. An internally threaded insert is added into the internal connecting receiving space of the dental implant, and rotatably indexed. It is held by a fixing part forming an axial abutment opposing an extraction of the internally threaded insert out of the inner connection receiving space.