Damping Dental Post Key Spring Mechanism
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Solution Overview
Problem
Current methods for implanting dental root posts during tooth restoration often apply excessive force, risking root fracture due to the high reaction forces involved in rotating the post into the prepared root canal.
Innovation Solution
A damping dental post key with a body and post carrier that compresses springs to reduce reaction forces, allowing smooth rotation of the dental root post into the canal with limited force applied, and featuring a fixed counterclockwise removal mechanism and a free quarter-cycle movement for clockwise insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to rotate the dental post into the root canal, then the post can be implanted, but excessive force is applied causing risk of root fracture
Solution Approach 1:
The patent incorporates a spring mechanism between the post carrier and the key body that compresses during rotation of the dental post. This spring acts as a cushioning element that absorbs and reduces the reaction forces generated during implantation, preventing excessive force from being transmitted to the root canal and preventing root fracture.
Solution Approach 2:
The spring mechanism serves as an intermediary element between the operator's rotational force and the dental post. It mediates the force transmission by compressing and decompressing, thereby reducing peak reaction forces while still enabling effective rotation and implantation of the post into the root canal.
2Ease of operation
If the dental post key allows free rotation for insertion, then smooth implantation is achieved, but removal requires excessive force
Solution Approach 1:
The patent creates asymmetric rotational characteristics by allowing free quarter-cycle movement in the clockwise direction (insertion) while providing fixed counterclockwise movement (removal). This asymmetry is achieved through the spring mechanism and key geometry, enabling easy insertion with minimal force while requiring controlled force for removal, preventing accidental dislodgement during insertion.
3Reliability
If the key has fixed movement in both directions, then control is maintained, but smooth rotation during insertion is compromised
Solution Approach 1:
The patent implements dynamic movement characteristics where the key allows free rotation in the insertion direction (clockwise) to achieve smooth implantation, while providing fixed controlled movement in the removal direction (counterclockwise). The spring mechanism dynamically adjusts to allow different movement types based on the direction of rotation, optimizing both ease of insertion and control during operation.
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
Prevents root fracture by applying a limited force during implantation and facilitates easy removal and insertion of the dental post, ensuring secure anchoring and retention without damaging the tooth structure.
Implementation Method 1
rotation of the body compresses a set of springs in contact with the post carrier reducing a reaction force
Implementation Method 2
A damping dental post key configured to implant a dental root post or dental post for restoration of a tooth
Data Source
AI summary
A damping dental post key configured to implant a dental root post for restoration of a tooth is described. The dental post key includes a body for handling and a post carrier having a key shape with respect to a head portion of the dental root post. During implantation of the dental post, rotation of the body compresses a set of springs in contact with the post carrier reducing a reaction force to a tooth root. In this way a limited force will be applied and a root fracture can be prevented. Further, the dental post key can be configured to have a fixed movement in a counterclockwise direction to remove the dental post and a free quarter-cycle movement with effort in a clockwise direction.