Dental Implant Thread Geometry for Bone Preservation
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Solution Overview
Problem
Current bone-integrable dental and orthopedic implants face challenges with minimal bone removal, ease of orientation during installation, and minimal damage to circulatory vessels, while improving stability post-installation, due to issues like material accumulation and fluid retention, which can lead to aseptic necrosis and delayed healing.
Innovation Solution
The implant features a thread geometry with distributed self-cutting hemispherical cavities and a diameter profile configuration, where the thread width is greatest in the central region, allowing for gradual bone compression and reduced bone loss, with a tapered core for easier insertion and a self-sharpening configuration to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wide threads are used to compress bone and increase stability, then stability after insertion is improved, but alignment during installation becomes difficult and bone loss increases
Solution Approach 1:
The implant thread is divided into multiple sections along its length, with each section having different thread widths and pitch characteristics. The upper portion has wider threads for compression and stability, while the lower portion has narrower threads for easier alignment and insertion, effectively segmenting the functional requirements along the implant length.
Solution Approach 2:
Different portions of the implant thread are given different geometric properties tailored to their specific functions. The upper threads are designed with larger width and pitch for bone compression and stability, while the lower threads have smaller width and pitch for facilitating alignment and initial insertion, applying local quality variations to resolve the contradiction.
2Ease of operation
If self-cutting structure is concentrated at the apical portion, then insertion into bone is facilitated, but material accumulation occurs leading to aseptic necrosis and delayed healing
Solution Approach 1:
The self-cutting function is segmented and distributed along multiple threads throughout the implant length rather than concentrated at the apical portion. Each thread section with hemispherical cavities acts as an independent self-cutting element, distributing the material removal function along the entire implant length to prevent accumulation.
Solution Approach 2:
Hemispherical cavities are extracted or removed from the bone material through the self-cutting action of the threaded structure. These cavities serve as channels for material and fluid egress, actively removing potential accumulation zones rather than allowing them to form, thereby preventing aseptic necrosis.
3Stability of the object's composition
If tapered core is used to compress bone gradually, then stability is improved and bone preservation is enhanced, but manufacturing complexity increases
Solution Approach 1:
The core diameter is varied along the length of the implant, transitioning from a larger diameter at the upper portion to a smaller diameter at the lower portion. This parameter change creates a tapered geometry that enables gradual bone compression and preservation while maintaining manufacturability through standard machining or additive manufacturing techniques.
Data Source
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AI summary
An implant (1) having one prosthetic interface (28, 29, 30, 31) in its cervical region (2), one core (22) and at least one thread (23) extending from the cervical region to an opposing apical region (3), wherethe outer diameter (24) of the core (22) decreases in the apical direction (19), and the external diameter (25) of the thread is constant in a first cylindrical portion (13) and decreases in a second tapered portion (12) also in the apical direction (19), where the decreasing rate (10) of the outer diameter of the thread (23) in its tapered portion (12) is greater than the decrease rate (9) of the core diameter (24), the greater height (104, 204) of the thread (23) occurs at the transition point between the cylindrical portion (13) and the tapered portion (12) of the thread, and the width of the thread (4, 5, 6, 7) is greater in the threads (4, 7) close to the cervical (1002) and apical (1003) ends, and smaller in the threads (5, 6) close to the transition point (27) between the cylindrical portion (13) and the tapered portion (12) of the thread (23). It also refers to a thread geometry (23) including semispherical surface cutting edges (40) spaced apart along their entire length.