Dental Implant Bolt Eccentric Engaging Shaft
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Solution Overview
Problem
Existing bolt fastening structures for dental implants face challenges in preventing slack, particularly in setting a receiver at a suitable position within small screw holes, leading to unreliable slack prevention and potential loosening over time.
Innovation Solution
A bolt fastening structure featuring a screw hole with an engaging hole of smaller diameter, where the bolt's screw shaft is slightly eccentric or inclined, engaging with the hole to generate prevailing torque and ensure secure fastening without requiring high fastening torque, allowing for easy application and stable slack prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiver is set at a suitable position in a small screw hole to prevent slack, then the slack prevention effect is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies asymmetry by making the engaging shaft slightly eccentric to the screw shaft, or the engaging hole slightly eccentric to the screw shaft. This eccentricity creates an asymmetric engagement geometry that generates horizontal stress and prevailing torque during fastening, providing reliable slack prevention without requiring complex additional components. The asymmetric design is simple to manufacture while effectively preventing bolt loosening.
2Reliability
If high fastening torque is applied to secure the bolt, then the fastening reliability is improved, but the risk of damaging the fixture or surrounding structures increases
Solution Approach 1:
The patent implements preliminary action by creating an engaging hole with a smaller diameter than the screw hole at the bottom of the screw hole, and providing an engaging shaft that engages with this pre-formed hole. This preliminary structural arrangement generates prevailing torque and horizontal stress during the fastening process, which secures the bolt without requiring excessively high fastening torque, thereby preventing damage to the fixture or surrounding structures.
3Reliability
If the engaging shaft is made eccentric to generate prevailing torque, then the slack prevention effect is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifying that the engaging shaft is slightly eccentric to the screw shaft, or the engaging hole is slightly eccentric to the screw shaft. The term 'slightly eccentric' indicates a controlled parameter deviation that generates the necessary horizontal stress and prevailing torque for slack prevention. This approach allows for effective slack prevention while maintaining reasonable manufacturing precision requirements, as the eccentricity is intentionally designed within acceptable tolerances rather than requiring extreme precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure provides a reliable and easy-to-apply solution for preventing slack in dental implants by maintaining a stable prevailing torque, reducing the likelihood of loosening, and ensuring secure fastening even with reduced fastening torque, thus enhancing the durability of dental implant fixtures.
Implementation Method 1
the outer peripheral surface of the engaging shaft engages with the inner peripheral surface of the engaging hole, and the screw shaft is slightly eccentric from or inclined to the screw hole in the range of looseness of the fit, and thus, the screw thread of the screw shaft is strongly pressed against the screw thread of the screw hole
Data Source
AI summary
There is provided an implant having a slack prevention function by an eccentric fitting structure. An engaging shaft 53, which is decentered with a screw shaft 52, is provided at the end of an abutment screw 5, and is engaged with an engaging hole 45 provided in the bottom of a screw hole 44, into which an abutment screw 5 is screwed, and thus, the screw shaft52 is inclined to and eccentric from the screw hole 44. Thereby, the screw shaft 52 comes to be strongly pressed partially in a circumferential direction toward the screw hole 44, so that internal stress in the horizontal direction is accumulated on the screw shaft 52. The screw 5 is threaded with maintaining prevailing torque caused by the internal stress, which enables the screw 5 to be fastened to the right position.