Dental Implant Fixture With Variable Screw Thread Diameter
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Solution Overview
Problem
Conventional dental implant fixtures face issues with insufficient initial fixing force in cancellous bone, bone absorption, and difficulty in inserting into desired directions due to stumpy screw threads and large implant holes, which prolong osseointegration and stability.
Innovation Solution
The dental implant fixture features a second screw thread with an increasing outer diameter and a sharp cross-sectional shape, allowing for enhanced initial fixing force, preventing bone absorption, and facilitating insertion in desired directions even with incorrectly formed implant holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional screw thread with uniform outer diameter is used, then the implant fixture can be inserted into the bone, but insufficient initial fixing force is achieved in cancellous bone
Solution Approach 1:
The patent applies different outer diameters to different portions of the screw thread. The second screw thread (in cancellous bone region) has a larger outer diameter than the first screw thread (in cortical bone region), creating local quality variation that optimizes fixing force in the softer cancellous bone while maintaining compatibility with the harder cortical bone.
2Ease of operation
If a large implant hole is formed to facilitate insertion, then the implant fixture can be inserted easily, but osseointegration takes a long time
Solution Approach 1:
The patent changes the outer diameter parameter of the screw thread along its length. The second screw thread has a larger outer diameter that allows insertion with less bone removal, while still achieving sufficient fixing force. This parameter change enables easier insertion without requiring a large implant hole, thereby reducing osseointegration time.
3Ease of manufacture
If a stumpy peak cross section screw thread is used, then the manufacturing is simple, but the implant fixture cannot be inserted in the desired direction when the implant hole is incorrectly formed
Solution Approach 1:
The patent employs an asymmetric screw thread cross-section with a sharp peak rather than a stumpy peak. This asymmetric geometry provides directional guidance during insertion, allowing the implant fixture to be correctly oriented even when the implant hole is slightly misaligned, while remaining manufacturable.
4Strength
If pressure is not sufficiently applied to the bone tissue during insertion, then the insertion process is gentle, but the implant fixture does not achieve sufficient initial fixing force
Solution Approach 1:
The patent applies local quality by increasing the outer diameter of the second screw thread in the cancellous bone region. This larger diameter enables sufficient pressure application to achieve initial fixing force and prevent bone absorption, while the first screw thread in the cortical bone region maintains a smaller diameter for compatibility with harder bone tissue.
Data Source
AI summary
The present invention relates to a dental implant fixture, and more particularly, to a dental implant fixture which rotates about a central axis thereof, and thus is inserted into a bone tissue constituted by a cortical bone and a spongy bone to form an artificial tooth root, wherein the dental implant fixture includes a first portion, a second portion, and a third portion. The first portion is inserted into the cortical bone and has an outer surface with a first screw thread whereon first vertices and first valleys are alternately arranged. The second portion is disposed beneath the first portion and inserted into the spongy bone, has an outer surface with a second screw thread whereon second vertices and second valleys are alternately arranged. The distance between the adjacent second vertices of the second screw thread is larger than the distance between the adjacent first vertices of the first screw thread. The third portion is disposed beneath the second portion, and has an outer surface with a third screw thread whereon third vertices and third valleys are alternately arranged, and a first cutting part which is hollowed such that the first cutting part is closer to the central axis than the third valleys. The lower outer diameter of the second screw thread is smaller than the upper outer diameter of the second screw thread.