Dental Implant With Multi-Zone Thread Geometry for Bone Stability
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Solution Overview
Problem
Current dental implants face challenges in achieving stability across different bone types, particularly soft bones, due to varying geometries and installation torques, which can lead to errors and complications during surgery.
Innovation Solution
A dental implant with optimized geometry featuring a core with varying angles and diameters, including a compressive region for bone compression and a cutting region for insertion, along with helical chambers to enhance primary stability and reduce the need for multiple drill bits, allowing for uniform installation torque across different bone types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dental implants with uniform geometry are used, then the implant structure is simple and easy to manufacture, but the implant cannot achieve adequate primary stability in soft bones and requires multiple drilling stages
Solution Approach 1:
The implant shaft is divided into multiple functional zones along its longitudinal axis: a first zone with a first pitch for cortical bone engagement, a second zone with a second pitch for trabecular bone engagement, and a third zone with a third pitch for additional stability. This segmentation allows each zone to optimize its thread geometry for the specific bone type it encounters, achieving reliable primary stability across diverse bone conditions without requiring complex external tools or multiple drilling stages.
Solution Approach 2:
Different portions of the implant shaft are equipped with locally optimized thread geometries tailored to specific bone types. The first zone features coarser threads designed for hard cortical bone, while the second and third zones have progressively finer threads suited for softer trabecular bone. This local quality variation enables the single implant structure to adapt to heterogeneous bone density profiles along the insertion path, eliminating the need for uniform geometry while maintaining manufacturability.
2Reliability
If threading males are used to prepare bone surface, then correct reception of implant screw thread is achieved, but the surgical procedure becomes more complex and time-consuming
Solution Approach 1:
The implant design merges the functions of multiple separate surgical tools into a single self-tapping implant structure. The multi-pitch screw threads inherently perform the bone preparation function that would otherwise require separate threading males, while simultaneously providing the final anchoring function. This merging eliminates the need for additional surgical instruments and procedural steps, reducing surgical complexity and time while ensuring accurate thread reception through the integrated geometry of the implant itself.
Solution Approach 2:
The implant is designed as a self-tapping device where the screw threads directly prepare and receive their own engagement path in the bone. The progressive pitch variation along the shaft enables the implant to automatically adapt to different bone densities during insertion, with the threads cutting and compacting bone in a single motion. This self-service capability eliminates the need for external thread preparation tools and multiple surgical stages, streamlining the procedure while maintaining reliable thread reception.
3Ease of manufacture
If cutting apical end implants are used, then thread opening males are replaced, but the threaded area is proportionally small reducing implant stability
Solution Approach 1:
The implant incorporates dynamic variation in thread pitch along its longitudinal axis, transitioning from coarser threads at the apical end for initial bone cutting and engagement to progressively finer threads toward the coronal end for enhanced stability and load distribution. This dynamic geometry allows the implant to maximize the effective threaded area while maintaining the simplified self-tapping insertion process, thereby improving implant stability without requiring additional surgical preparation steps.
Data Source
AI summary
A dental implant including a core; at least one screw thread; a first and second region; a central axis; the surface of the core defining an angle with the central axis in the first region and with the central axis in the second region; and the surface of the screw thread defining an angle with the central axis in the first region and with the central axis in the second region. The diameter of the core decreases at a rate in the first region towards the apical end such that the core defining angle is greater than the screw thread defining angle, and the diameter of the core decreases at a rate in the second region towards the apical end such that the core defining angle is the same as the screw thread defining angle. Furthermore, an implant including at least one helical chamber including a depth and length.