Multi-tapered Dental Implant Screw Bone Trauma Reduction
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Solution Overview
Problem
Traditional dental implant screws cause bone trauma, fractures, and reabsorption due to their cylindrical design, leading to incorrect positioning, secondary tilt, and aesthetic defects during bone expansion and integration.
Innovation Solution
A multi-frustum screw with a double tapered shape, featuring a central diameter with progressively decreasing angles to the upper and lower ends, reducing pressure on the bone and minimizing trauma, thereby enhancing bone integration and aesthetic outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional cylindrical implant screws are used, then the implant can be inserted into the bone, but bone trauma, fractures, and reabsorption occur due to excessive pressure during final torque
Solution Approach 1:
The patent changes the geometric parameters of the implant screw from a uniform cylindrical shape to a multi-frustum configuration with varying diameters. The screw features a first frustum with a larger diameter at the insertion end, a second frustum with a smaller intermediate diameter, and a third frustum with a larger diameter at the fixation end. This parameter variation allows the implant to distribute pressure differently during insertion and fixation, reducing bone trauma while maintaining insertion capability.
Solution Approach 2:
The implant screw is segmented into three distinct frustums with different diameters and functions. The first frustum (larger diameter) facilitates insertion by reducing initial resistance, the second frustum (smaller diameter) reduces pressure on the bone during final torque, and the third frustum (larger diameter) provides stable fixation. This segmentation allows each portion to optimize its function, resolving the contradiction between insertion ease and trauma reduction.
2Manufacturing precision
If bone expansion is performed to correct defects and knife edges, then the implant can be positioned correctly, but the cortical area reabsorbs leading to exposure of implant threads and aesthetic defects
Solution Approach 1:
The multi-frustum design changes the pressure distribution parameters along the implant length. The intermediate frustum with smaller diameter creates a pressure gradient that protects the cortical bone from excessive compression during final torque, preventing the reabsorption cascade that leads to thread exposure and aesthetic defects, while still allowing accurate positioning through the expanded bone.
3Stability of the object's composition
If the implant is tightened to achieve stable fixation, then the implant remains securely in place, but secondary tilt occurs due to non-controlled bone expansion
Solution Approach 1:
The segmented multi-frustum design allows different portions of the implant to perform different functions during fixation. The first and third frustums with larger diameters provide anchorage points that resist rotational forces and maintain orientation, while the intermediate frustum with smaller diameter allows controlled compression without causing tilt. This segmentation resolves the contradiction between achieving stable fixation and maintaining correct implant orientation.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
The present invention relates to a screw suitable for being implanted inside a bone, characterised in that said screw comprises two to four inverted cones along the longitudinal axis thereof, where the narrowest tip of the bottom cone corresponds to the bottom tip of the screw and where the height of each one of the cones at either end of the screw is between 20% and 80% of the total length of the screw, ensuring better acceptance, adaptation and osseous integration, and reducing trauma due to the pressure the implant exerts on the bone when the screw is fully tightened, minimizing re-absorption and, thus, producing more aesthetically pleasing results.