Three-Lobe Prosthetic Dental Screw Coupling for High-Angle Torque
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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, especially 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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the angulation between screwdriver and screw is increased to overcome positioning problems, then the flexibility and number of solutions increase, but the risk of stripping the screw head and tool disengagement increases
Solution Approach 1:
The screw head hollow is divided into three distinct lobes with arc-shaped contact surfaces, creating segmented engagement zones. This segmentation allows the screwdriver to distribute torque across multiple contact points, reducing stress concentration and preventing stripping even at high angulations up to 50 degrees.
Solution Approach 2:
The contact surfaces of the lobes are designed with arc-shaped curved geometries that complement the spherical tip of the screwdriver. This curvature enables the screwdriver to maintain stable contact and transmit torque effectively during angular operations, preventing disengagement while accommodating angulations beyond the conventional 35 degrees.
2Adaptability or versatility
If conventional five or six lobules are used to achieve 35 degree inclination, then some angulation capability is provided, but the contact surface area is insufficient leading to wear and stripping
Solution Approach 1:
Each of the three lobes is equipped with an arc-shaped contact surface optimized for specific angular ranges. This local quality enhancement ensures that the contact surfaces are specifically designed to distribute stress and prevent wear at the points of highest stress during angular tightening operations.
Solution Approach 2:
The invention transitions from the conventional five or six lobules design to a three-lobe configuration with arc-shaped surfaces that engage in a different geometric dimension. This dimensional change in the contact geometry allows for more effective torque distribution and reduced wear at the contact points during angular operations.
3Ease of manufacture
If the screw head geometry is simplified for easier manufacture, then manufacturing cost decreases, but the ability to transmit torque at high angles is reduced
Solution Approach 1:
The three-lobe hollow geometry with arc-shaped surfaces serves multiple functions: it enables high-angle tightening up to 50 degrees, transmits torque effectively through distributed contact, and maintains compatibility with standard spherical screwdriver tips. This universal design achieves complex functionality through a relatively simple geometric form that can be manufactured using conventional CNC machining processes.
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.