Overdenture Holder Abutment Central Through Hole Design
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Solution Overview
Problem
Conventional overdenture coupling devices face issues with precision positioning, uneven load distribution, increased manufacturing complexity, and reduced durability due to their complex and precise structures, which lead to fractures and decreased utilization of fixing bars.
Innovation Solution
A digital overdenture holder device with a holder abutment featuring a through insertion portion and a pressurizing device that provides a uniform pressurizing force to the fixing bar, allowing for precise alignment and stable fixation, while separate fastening and pressurizing screws minimize load moments and enable the use of various fixing bar sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional bar type coupling device with a through hole protruding from the side surface of the abutment is used, then the fixing bar can be inserted and fixed, but the pressurizing force becomes laterally spaced apart from the transfer position, causing uneven load distribution and breaking the weak part of the abutment
Solution Approach 1:
The patent extracts the through hole from the protruding side surface position and relocates it to pass through the longitudinal central part of the abutment body. This separates the fastening function from the pressurizing function, allowing the pressurizing force to be applied centrally without lateral offset, thereby eliminating uneven load distribution and preventing abutment failure.
Solution Approach 2:
The patent changes the dimensional arrangement of the through hole from a lateral protrusion to a longitudinal central passage. By repositioning the through hole along the longitudinal axis of the abutment, the pressurizing force can be applied directly through the center of gravity, converting an asymmetric lateral load into a symmetric axial load that distributes evenly through the abutment structure.
2Reliability
If the fastening screw is formed to pass through the longitudinal central part while the through hole protrudes from the side surface, then the abutment can be fixed to the fixture, but the pressurizing force position is laterally spaced apart from the transfer position, causing uneven load and breaking the abutment
Solution Approach 1:
The patent merges the fastening hole and pressurizing through hole into a single longitudinal central passage. This integration allows both the fastening screw and the pressurizing force to act through the same central axis of the abutment, simplifying the structure while ensuring that the pressurizing force is applied directly over the transfer position, thereby improving reliability without increasing complexity.
Solution Approach 2:
The longitudinal central through hole serves multiple functions: it accommodates the fastening screw for securing the abutment to the fixture, and simultaneously provides the pathway for applying pressurizing force to the fixing bar. This multi-functional design eliminates the need for separate lateral protrusions, reducing structural complexity while enhancing reliability through centralized force application.
3Adaptability or versatility
If the through hole is formed to have a shape substantially matched with the sectional shape of the fixing bar, then the fixing bar can be fixed, but only fixing bars of a particular size can be used, degrading utilization
Solution Approach 1:
The patent designs the through hole with a universal circular cross-section that can accommodate fixing bars of various sizes and shapes. This standardized circular opening serves as a multi-functional pathway that can receive different types of fixing bars without requiring custom-shaped holes, thereby enhancing versatility while maintaining simple manufacturing processes.
Solution Approach 2:
The patent changes the geometric parameter of the through hole from a custom-shaped opening matched to a specific fixing bar section to a standardized circular cross-section. This parameter change allows the same abutment design to work with various fixing bar sizes and shapes, improving adaptability without complicating the manufacturing of the abutment itself.
4Manufacturing precision
If a complicated and excessively precise structure is necessary for manufacturing the abutment, then the coupling device can be assembled, but the level of difficulty in manufacturing increases such that manufacturing costs increase
Solution Approach 1:
The patent extracts the complex lateral protrusion structure and replaces it with a simple longitudinal central through hole. This simplification removes the need for excessively precise lateral positioning and complex shaping operations, thereby reducing manufacturing difficulty and costs while maintaining sufficient precision for proper assembly and function.
Solution Approach 2:
Instead of creating a complex protruding structure from the side surface, the patent inverts the approach by forming a simple central passage through the abutment body. This inverted design philosophy prioritizes manufacturing simplicity over structural complexity, achieving the necessary precision through a straightforward longitudinal hole that is easier and less costly to manufacture.
5Volume of moving object
If the fixing bar passes a protruding part on the side surface of the abutment, then the coupling device can be assembled, but the volume of the coupling device increases, requiring a larger insertion portion in the overdenture
Solution Approach 1:
The patent extracts the protruding side surface structure and relocates all functional elements to the longitudinal central axis of the abutment. This consolidation removes lateral protrusions that increase volume, creating a more compact coupling device that requires a smaller insertion portion in the overdenture, thereby improving ease of operation and insertion.
Solution Approach 2:
The patent merges the fastening function and pressurizing function into a single longitudinal central through hole, eliminating the need for separate lateral protrusions. This consolidation reduces the overall volume of the coupling device by combining multiple functions into one centralized structure, allowing for a smaller insertion portion and easier overdenture placement.
Data Source
AI summary
The overdenture holder device includes a holder abutment in which a through insertion portion is formed to be opened in both directions of a body portion having a bottom end portion inserted into a top end of the fixture and protruding upward and a fastening hole penetrates along a longitudinal direction and has an inner circumferential side on which a holding step protruding radially inward is formed, a fastening screw having a bottom end portion inserted into the fastening hole to be screw-coupled with the inside of the top end of the fixture and a head portion formed at a top end portion and to be held by the holding step, and a pressurizing device coupled with a top end of the body portion and configured to provide a pressurizing force such that an outer surface of the fixing bar is fixed to an inside of the through insertion portion.