Dental Prosthetic Screw Coupling for High-Angle Torque Transfer
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Solution Overview
Problem
Existing dental prosthetic screws and screwdrivers have limitations in angulation, durability, and flexibility, with risks of stripping, disengagement, and insufficient torque transmission, particularly when inclinations exceed 35 degrees.
Innovation Solution
A dental prosthetic screw with a unique head design featuring a longitudinal hollow and a screwdriver with complementary projections, allowing for angulation up to 45 or 50 degrees, reducing wear and improving torque transmission through a robust and reliable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional screw and tool assemblies with five or six lobules are used, then tightening torque can be applied with inclination up to 35 degrees, but the angulation capability is limited and cannot exceed 35 degrees
Solution Approach 1:
The invention employs asymmetric geometry in the hollow of the screw head and the corresponding head of the tool, with three lobes arranged at specific angles (e.g., 0°, 120°, 240°) rather than symmetric five or six lobules. This asymmetric configuration enables the tool to be inclined at angles greater than 35 degrees (up to 60 degrees or more) relative to the screw axis while maintaining proper engagement and torque transmission, thereby resolving the contradiction between adaptability and device complexity.
2Reliability
If conventional screw heads with five or six lobules are used, then tightening can be performed, but the screw head is susceptible to wear and stripping
Solution Approach 1:
The invention applies local quality by distributing the contact points between the tool head and screw hollow across three strategically positioned lobes. Each lobe provides a localized contact area that is optimized for torque transmission. This configuration reduces stress concentration at any single point compared to conventional five or six lobule designs, thereby improving resistance to stripping and wear while maintaining adequate engagement geometry.
3Reliability
If conventional screw and tool assemblies are used, then tightening torque can be applied, but the tool may disengage from the screw head during use
Solution Approach 1:
The invention incorporates curved or spherical elements in the geometry of the tool head and screw hollow interface. The lobes are designed with rounded contours that facilitate smooth engagement and maintain contact during inclined tightening operations. This curvature allows the tool to remain properly engaged with the screw head even when inclined at angles greater than 35 degrees, preventing disengagement while preserving ease of operation through intuitive tool placement and operation.
Data Source
AI summary
Dental prosthetic screw, tightening tool and coupling system firstly refers to a screw for retaining and fixing a dental element in a dental implant, said dental element being able to be any component that preferably aims to support a dental structure or dental prosthesis, preferably machined or laser sintered or laser sintered and re-machined or machined by CAD/CAM, and even the structure itself or dental prosthesis. Therefore, different components are used in the manufacture of prostheses on dental implants in human implantology, requiring said components to be retained and fixed to the dental implant by means of screws on the implant. Moreover, the invention relates to a screwdriver or tightening tool compatible with said dental screw and a tightening or coupling system formed by the two.