Zygomatic Implant Partially Interrupted Thread Design
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Solution Overview
Problem
Current zygomatic implants cause tissue irritation and discomfort due to interaction with soft tissues after external installation, and lack adequate primary stability, especially when the external installation technique is used, leading to potential installation inaccuracies and instability.
Innovation Solution
A zygomatic implant with a partially interrupted threaded portion, featuring a smooth longitudinal strip and screw threads in specific regions to minimize tissue interaction and ensure stability, with a conical apical region and a smooth cervical surface to reduce irritation and improve installation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If screw threads cover the entire implant body, then mechanical stability is improved, but tissue irritation and discomfort increase
Solution Approach 1:
The implant body is segmented into distinct regions: a threaded apical portion for bone engagement, a smooth intermediate portion for sinus cavity passage, and a threaded cervical portion for soft tissue engagement. This segmentation allows each region to have optimized surface characteristics for its specific function, resolving the contradiction between needing threads for stability and avoiding them for tissue comfort.
Solution Approach 2:
Different surface qualities are applied to different portions of the implant. The apical and cervical portions have threaded surfaces for mechanical engagement, while the intermediate portion has a smooth surface to minimize tissue irritation. This local differentiation of surface quality allows the implant to simultaneously achieve stability and comfort.
2Object-affected harmful factors
If the intermediate portion is entirely smooth, then comfort is improved, but installation accuracy and primary stability deteriorate
Solution Approach 1:
The implant is divided into functional segments where the intermediate portion remains smooth for comfort, but the apical and cervical portions retain threading for precision installation and stability. The threaded apical portion ensures accurate positioning during installation while the smooth intermediate portion maintains comfort.
Solution Approach 2:
The threaded apical portion performs the preliminary action of securing the implant accurately in the bone during installation. This allows the smooth intermediate portion to subsequently provide comfort without compromising the installation accuracy already established by the threaded apical region.
3Stability of the object's composition
If screw threads are present in the cervical region, then primary stability is improved, but tissue irritation increases
Solution Approach 1:
The cervical portion is designed with a threaded surface that provides mechanical engagement with the soft tissue for stability, while the threading is configured to minimize irritation. The threads in this region are optimized to balance the need for retention with the need to avoid excessive tissue stress and irritation.
Solution Approach 2:
The threaded cervical portion allows for dynamic adaptation to the soft tissue, providing initial mechanical stability that transitions to osseointegration over time. The threading provides immediate stability during the healing period while the smooth intermediate portion minimizes long-term irritation.
4Ease of operation
If the implant is inserted with threaded portion first, then installation is simplified, but positioning accuracy deteriorates
Solution Approach 1:
The segmented design with distinct threaded and smooth portions allows the implant to be inserted in a specific sequence: the threaded apical portion is inserted first to establish accurate positioning and anchorage, followed by the smooth intermediate portion, and finally the threaded cervical portion. This sequential insertion maintains both simplicity and accuracy.
Solution Approach 2:
The threaded apical portion performs the preliminary action of establishing accurate positioning and secure anchorage in the bone before the rest of the implant is inserted. This preliminary anchorage serves as a guide that ensures subsequent portions are positioned accurately, maintaining both ease of operation and positioning precision.
Data Source
AI summary
An implant includes an elongated and cylindrical body; conical apical region coated by a screw thread and with at least three helical chambers and semi-spherical end; and a cervical region defined by a smooth cervical surface. The elongated and cylindrical body includes at least one longitudinal strip having a substantially smooth surface. The smooth longitudinal strip is located in the zygomatic implant cervical portion. The connection between the screw threads and the smooth longitudinal strip is made by a transition curvature, and the smooth longitudinal strip is aligned with one of the flat sides of the internal area with hexagonal cross section of the implant prosthetic interface.