Angled Dental Component with Longitudinal Fins
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Solution Overview
Problem
Existing dental prostheses with angled through passages for fixing screws on dental implants require significant material removal, compromising mechanical strength and making it difficult to access the screwing tool within limited oral space while preserving active tooth parts.
Innovation Solution
A dental component with a first element featuring a non-zero angled through passage and a second element with longitudinal fins, allowing the screw to pass through the fins and be screwed into the implant, while the screw head rests on the fins for retention, reducing material removal and maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an angled through passage is used in the prosthesis core to accommodate the fixing screw, then the screw can be routed along a curved trajectory to meet implant orientation constraints and preserve active tooth parts, but significant material removal is required which weakens the mechanical strength of the prosthesis
Solution Approach 1:
The prosthesis is divided into two separate elements: a first element (core or abutment) containing the angled passage, and a second element (retaining element) containing the axial passage and longitudinal fins. This segmentation allows each element to be optimized independently - the first element provides the needed angular adaptability while the second element provides strong axial retention, eliminating the need for complex intersecting passages in a single element.
Solution Approach 2:
The longitudinal fins act as an intermediary mechanism between the axial movement of the fixing screw and the angular orientation of the first element. As the screw advances axially, the fins engage with the angled passage walls, converting the axial motion into angular retention without requiring the screw to follow a complex curved trajectory through the prosthesis core.
2Ease of operation
If a curved trajectory passage is created for the fixing screw, then the screw can access the implant while preserving active tooth parts, but the material removal weakens the prosthesis structure
Solution Approach 1:
The passage system is segmented into two separate elements with different passage configurations. The first element has an angled passage for screw routing, while the second element has a simple axial passage. This segmentation allows the screw access pathway to be optimized for ease of operation without compromising the structural integrity of either element.
Solution Approach 2:
Instead of routing the screw through a complex curved trajectory in the prosthesis core, the solution inverts the approach by using a second element with longitudinal fins that convert axial screw movement into angular retention. The screw follows a simpler axial path while the fins provide the angular adaptation function.
3Adaptability or versatility
If material is removed to create an angled through passage, then the prosthesis can be fixed on the implant with proper orientation, but the mechanical strength of the prosthesis is unnecessarily weakened
Solution Approach 1:
The prosthesis system is segmented into two elements, each with optimized passage configurations. The first element contains the angled passage necessary for orientation adaptation, while the second element contains the axial passage with longitudinal fins for reliable retention. This segmentation distributes the functional requirements across separate elements, allowing each to maintain optimal structural integrity for its specific function.
Solution Approach 2:
The retaining element is constructed from two different materials: a ceramic core providing structural integrity and aesthetic properties, and a metallic coating layer providing toughness and bonding surface for the longitudinal fins. This composite structure enhances both the mechanical reliability and the functionality of the retaining element without compromising the orientation adaptation capability of the first element.
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
This design allows for secure fixation of the dental prosthesis on a dental implant with an angled passage, addressing orientation constraints and preserving active tooth parts without unnecessarily weakening the prosthesis, and facilitates easier screw access and tool rotation with reduced material removal.
Implementation Method 1
a relative displacement in translation of the fixing screw towards the second element along the second longitudinal axis causes a radial displacement of the free distal parts of the longitudinal fins away from the second longitudinal axis to press them against the side wall of the first passage section
Implementation Method 2
the screw head 10 comprises a substantially frustoconical contact surface 10b intended to come into contact against the free distal parts 130a to 130c of the longitudinal fins 13a to 13c
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A dental component (1) for the single-unit prosthetic restoration of a tooth, intended to be received on a dental implant, comprising: - a first element (3) with an angled through-hole (4), - a second element (7) intended to be received against or within a dental implant (2). Assembly means (9, 13a-13c) between the first (3) and second (7) elements allow for the efficient reduction of material to be removed from the first element (3) to create the angled through-hole (4).