Dental Implant Threader with Rectangular Plate Geometry
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Solution Overview
Problem
Dental implants with traditional screw threads tend to cause excessive stress and damage to alveolar bones due to differences in strength and elasticity between titanium and bone, leading to potential bone fracture under occlusal force, as they compress the bone in multiple directions and generate shear forces.
Innovation Solution
A dental implant with a threader having a rectangular plate-shaped thread portion, specified pitch and thickness, and a controlled screw thread angle, which compresses the alveolar bone in only one direction, minimizing stress and maximizing stress dispersion by optimizing the thread geometry to match the bone's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional screw thread with triangular cross section is used, then the thread is easily inserted during rotation, but it compresses the alveolar bone in multiple directions including horizontal direction, causing bone damage and fracture
Solution Approach 1:
The patent changes the geometric parameters of the thread cross-section from a traditional triangular shape to a specific quadrangular shape with defined side lengths and angles. This parameter modification allows the thread to compress bone primarily in the vertical direction while minimizing horizontal compression, thus preventing bone damage while maintaining ease of insertion.
Solution Approach 2:
Instead of optimizing the thread shape for easy insertion (sharp triangular tips), the patent inverts the approach by designing a quadrangular cross-section that prioritizes bone protection. The inverted design accepts slightly increased insertion effort in exchange for preventing the harmful multi-directional compression that causes bone fracture.
2Force
If the screw thread compresses the alveolar bone in vertical and horizontal directions, then insertion is achieved, but shear force is generated between thread and bone, increasing the risk of bone fracture
Solution Approach 1:
The patent modifies the thread geometry parameters, specifically the cross-sectional shape and dimensions, to alter the force distribution. The quadrangular cross-section with specific side lengths and angles redirects the compression force primarily in the vertical direction, minimizing horizontal components that generate shear force, thus maintaining fixing force while preventing bone fracture.
3Strength
If a conventional thread design is used, then the fixture can be fixed into the alveolar bone, but the difference in strength and elasticity between titanium and bone is not considered, making bone fracture likely under occlusal force
Solution Approach 1:
The patent optimizes the thread parameters including cross-sectional dimensions and angles to account for the elasticity difference between titanium and bone. The quadrangular cross-section with specific geometric parameters allows the thread to flex slightly under load, accommodating the elastic properties of bone while maintaining strong fixation, thereby preventing fracture under occlusal force.
4Ease of operation
If the thread portion has a triangular cross section, then insertion during rotation is easy, but compression in multiple directions generates excessive stress on the alveolar bone
Solution Approach 1:
The patent changes the stress distribution parameters by modifying the thread cross-section from triangular to quadrangular with specific side lengths and angles. This geometric transformation concentrates compression stress primarily in the vertical direction where the bone can better withstand the load, while reducing stress in horizontal directions, thus maintaining ease of insertion with reduced overall stress on the bone.
Data Source
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Figure 3(a)~3(b)
Figure 4
AI summary
The present invention relates to a magic threader for a dental implant, and more particularly, to a magic threader for a dental implant that is capable of increasing a coupling strength under a stable structure by specifying a thickness of a thread portion, a height of a screw thread of the thread portion, and a pitch between thread portions in consideration of a difference in a strength between titanium and a bone to decrease a stress of an alveolar bone by the thread portion as much as possible and prevent damage to the alveolar bone as much as possible and is capable of conducting compression of the thread portion for the alveolar bone in only one direction (direction A), minimizing compression of the thread portion for the alveolar bone in a direction B or a direction C inclined with respect to the direction A, and maximizing stress dispersion by configuring the thread portion in a rectangular plate shape and specifying an angle of the screw thread in a specific numerical range.