Dental Implant Connecting Screw Stepped Stem Design
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Solution Overview
Problem
Current dental implants face challenges with unreliable fixation in spongy bone due to low thread profile and small pitch, leading to delayed prosthetics and potential fractures, especially in patients with varying gingiva heights, and existing connecting screws lack reliability and are prone to loosening.
Innovation Solution
A connecting screw with a stepped stem design, where the lower part is bored to fit within the abutment support thread and the upper part remains unchanged, ensuring a secure connection by varying the distance between the screw head and the support thread to accommodate different gingiva heights, providing a stronger and more reliable attachment between the abutment and base part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base part has an external thread with small pitch and low profile, then the implant can be placed in the bone, but the fixation in spongy bone is unreliable and cannot withstand early masticatory loads
Solution Approach 1:
The external thread is divided into two distinct segments: a first portion with large pitch and high profile for initial anchoring in spongy bone, and a second portion with small pitch and low profile for final secure fixation. This segmentation allows each portion to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the external thread are given different geometric characteristics tailored to their specific functions. The first portion has large pitch and high profile locally optimized for engagement with spongy bone, while the second portion has small pitch and low profile locally optimized for secure fixation, creating local quality variations along the thread length.
2Reliability
If prosthetics are made only in 3-6 months after implant placement, then the implant has time to osseointegrate, but the treatment period is delayed
Solution Approach 1:
The external thread is designed in advance with a first portion optimized for spongy bone engagement, providing immediate preliminary stabilization upon implant placement. This preliminary action secures the implant firmly enough to potentially allow for earlier prosthetic attachment while maintaining osseointegration quality.
3Strength
If the abutment connecting zone has a conical structure, then mechanical connection is improved and hermetic seal is formed, but height displacement occurs due to tolerances in angle and diameter
Solution Approach 1:
A platform is introduced as an intermediary element between the conical abutment connecting zone and the base part receiving hole. This platform serves as a reference surface that defines the height position of the abutment, mediating the connection and eliminating height displacement caused by conical tolerance accumulation. The platform provides a stable, precise seating surface that compensates for variations in conical geometry.
4Ease of manufacture
If the connecting screw has a standard design, then it can be manufactured easily, but it is prone to loosening and lacks reliability in patients with varying gingiva heights
Solution Approach 1:
The connecting screw incorporates a dynamic element - a resilient element positioned between the screw head and the abutment platform. This resilient element allows the screw to adapt to variations in gingiva height and provides continuous contact pressure, maintaining reliable connection despite dimensional variations. The dynamic adjustment capability compensates for manufacturing tolerances and patient-specific anatomical variations.
Solution Approach 2:
The resilient element changes its physical state (compression/extension) in response to varying gingiva heights, dynamically adjusting the contact parameters between the screw and abutment. This parameter change allows the same screw design to reliably accommodate a range of gingiva heights while maintaining secure fixation.
Data Source
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AI summary
The invention relates to surgical and orthopedic dentistry, in particular to implantology, namely to devices for placement of dental prosthesis in place of a lost tooth, or rather to tooth (dental) implants. The dental implant for placement in the jaw bone, consisting of the base part, the abutment and the connecting screw, the connecting screw stem is made stepwise, and its lower part up to the stem thread has a diameter not exceeding the inner diameter of the abutment support thread, and the distance from the screw head to its upper end is less than the distance along the axis from the screw head to the abutment support thread by 0.1-1mm (optimally by 0.2-0.3 mm). Kit for implantation of the dental implant according to item 1, which includes the basic part of the implant, abutment, and auxiliary elements, the latter is a set of connecting screws with a screw pitch corresponding to the size of the abutment for prosthesis implantation in patients with high, medium and low gingiva height.