Dental Implant Abutment Locking for Adhesive-Free Prosthesis Fit
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Solution Overview
Problem
Existing dental prosthesis attachment methods using adhesives are non-reproducible, irreversible, and prone to contamination, and screw-retained prostheses face alignment issues and inadequate force distribution, leading to fractures and sealing problems.
Innovation Solution
A linking device with a body, through hole, and blocker mechanism that uses a fixing screw to secure the prosthesis to an anchor, featuring anti-rotation devices and a blocker that deforms to lock the prosthesis in place, eliminating the need for adhesives and allowing for precise alignment and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive or cement is used to secure the dental prosthesis to the abutment, then the prosthesis is firmly attached, but the bonding process is non-reproducible, irreversible, and prone to contamination
Solution Approach 1:
The patent replaces the chemical bonding system (adhesive/cement) with a mechanical retention system. The prosthesis is secured through precise mechanical interlocking between the abutment's external form and the prosthesis's internal cavity, eliminating the need for adhesives and their associated reproducibility issues.
Solution Approach 2:
The invention divides the attachment system into separate functional components: the abutment with its unique external form and the prosthesis with its complementary internal cavity. This segmentation allows for precise mechanical fitting without chemical bonding, enabling both strong attachment and reproducibility.
2Reliability
If a screw-retained prosthesis is used without bonding, then the prosthesis is sterile and autoclavable, but sealing problems occur between components and force distribution is inadequate
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the abutment and prosthesis interface. The external form of the abutment and internal cavity of the prosthesis are designed with specific local geometries that provide both sealing contact surfaces and optimal force distribution areas, addressing both sealing and force distribution problems simultaneously.
3Strength
If the prosthesis is pre-bonded to the abutment before transfer to the implant, then the assembly is secure, but adjustments to contact points become difficult and require destruction of the peri-implant tissue attachment
Solution Approach 1:
The invention creates a dynamic attachment system where the prosthesis can be easily assembled and disassembled from the abutment without damage. The mechanical interlocking design allows for repeated assembly and adjustment of contact points while maintaining security, eliminating the need to destroy peri-implant tissue attachments for modifications.
4Ease of manufacture
If tolerance issues and imperfect fit of components occur, then manufacturing is simpler, but force concentration during mastication leads to fracture of the dental prosthesis or its components
Solution Approach 1:
The patent designs the abutment and prosthesis with specific local geometric features that compensate for manufacturing tolerances. The external form and internal cavity are shaped to provide self-aligning contact surfaces that distribute forces evenly across the interface, preventing stress concentration and fracture even when tolerance variations exist.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The linking device provides a secure, adjustable, and reversible attachment that reduces contamination risks, simplifies installation, and enhances force distribution, minimizing fractures and wear, while allowing for easy removal without disturbing the anchor.
Implementation Method 1
A screw passes through the prosthesis and the abutment to anchor itself to the implant, which serves as the base for the dental reconstruction
Implementation Method 2
the blocker partially obstructing the through hole of the linking device to deform upon contact with the fixing screw
Implementation Method 3
The internal wall of the body defining the cavity forms an internal anti-rotation device configured to block the rotation of the linking device relative to the stud
Data Source
Figure 1~4
Figure 5~9
Figure 10~12
AI summary
A dental reconstruction comprises a connection device (2) with a first end bearing on an anchor (1) and a second end supporting a prosthesis (3). The cross section decreases between the first end and the second end. The connection device (2) defines a through-hole (9) and an abutment (10). A fastening screw (4) screws into an internally threaded portion (6) of the anchor (1) in order to fasten the connection device (2). A blocker (11) has a cross section that increases upon insertion of the fastening screw (4) into the through-hole (9). The blocker (11) fits into a groove (12) of the prosthesis (3) covering the connection device (2). The screw head (4a) has a circular section bearing on the blocker (11) in order to deform the blocker (11) and fit the blocker (11) into the groove (12) of the prosthesis (3).