Dental Implant Fixture With Segmented Screw Threads
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Solution Overview
Problem
Dental implant fixtures face a challenge in achieving a high initial fixing force without significantly increasing implantation torque, which can lead to bone absorption and reduced stability due to the sharp increase in screw threads during insertion.
Innovation Solution
The design includes a first portion with a first screw thread for cortical bone, a second portion with a second screw thread for cancellous bone, and a third portion with a cutting edge for easy insertion, where the second screw thread has equal peak distances to the first thread and smaller inner diameters, reducing torque and preventing bone absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of screw threads is sharply increased to increase initial fixing force, then the initial fixing force is improved, but the implantation torque is significantly increased causing bone absorption
Solution Approach 1:
The patent applies different screw thread configurations to different portions of the implant fixture. The first portion (cortical bone engagement) has a first screw thread with specific pitch and depth optimized for cortical bone, while the second portion (cancellous bone engagement) has a second screw thread with different characteristics. This local differentiation allows each portion to contribute appropriately to fixing force without any single portion generating excessive torque that would cause bone absorption.
Solution Approach 2:
The implant fixture is divided into multiple portions with different screw thread configurations. The first portion engages cortical bone with a first screw thread, while the second portion engages cancellous bone with a second screw thread. This segmentation allows the system to distribute the load and torque generation across different bone types, preventing concentration of stress that would lead to bone absorption while still achieving high overall fixing force.
2Reliability
If the number of screw threads is increased to achieve firm implantation, then the stability is improved, but the implantation time is increased due to higher torque resistance
Solution Approach 1:
The patent optimizes screw thread characteristics for specific bone types: the first screw thread in the cortical bone portion has parameters optimized for engaging dense cortical bone, while the second screw thread in the cancellous bone portion has parameters optimized for softer cancellous bone. This local optimization allows each portion to be implanted efficiently without excessive torque, reducing total implantation time while maintaining overall stability.
Solution Approach 2:
The patent varies screw thread parameters (pitch, depth, profile) between different portions of the implant. The first screw thread has specific pitch and depth values optimized for cortical bone, while the second screw thread has different values optimized for cancellous bone. These parameter changes allow each portion to engage its respective bone type efficiently, reducing implantation resistance and time while ensuring stable fixation.
Data Source
AI summary
An implant fixture that is inserted into a bone tissue formed of a cortical bone and a cancellous bone while rotating on a central axis to thereby form an artificial tooth root, the implant fixture including a first portion that is inserted into the cortical bone and includes a first screw thread having first peaks and first roots alternating with one another on an outer surface of the first portion; and a second portion that is disposed below the first portion and inserted into the cancellous bone.