Dental Impression Coping Angular Alignment Mechanism
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Solution Overview
Problem
Conventional impression copings for dental prostheses face challenges in accurately capturing the positions of implants with different angles, leading to inaccurate fittings, stress on implants, and potential self-closure issues during removal, which can result in premature failure of ceramic bridges and stress on implants.
Innovation Solution
An axially symmetric impression coping design featuring a central screw with a tubular screw system, including internal and external screws, and movable elements that allow for secure fixation and controlled release, ensuring the angular positions of counterparts remain unchanged during removal, thereby preventing displacement and self-closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional impression copings are used with steep conical implants, then the geometry of the matching portion can be simplified, but self-closure occurs during applying wax and removal becomes difficult when divergence between implant axes exceeds the cone angle
Solution Approach 1:
The impression coping incorporates a movable element that can shift position in response to applied force. During removal, when force is applied to the coping, the movable element shifts to accommodate the force vector, allowing the coping to be removed even when the implant axes diverge beyond the cone angle, thereby preventing self-closure
Solution Approach 2:
The design changes the geometric parameters of the matching portion between the impression coping and implant. By adjusting the cone angle and geometry of the matching portion, the system accommodates greater divergence between implant axes while preventing self-closure during removal
2Device complexity
If conventional impression copings are used, then the structure can be simple, but displacement occurs during removal causing inaccurate fitting and stress on implants
Solution Approach 1:
The impression coping is designed to maintain the angular positions of counterparts unchanged during removal through its specific geometric configuration. The movable element shifts in a controlled manner that preserves the relative angular relationships, preventing displacement and ensuring accurate fitting
Solution Approach 2:
The impression coping is divided into distinct functional components: a fixed portion that maintains angular positions and a movable element that shifts during removal. This segmentation allows the structure to remain relatively simple while achieving high precision in capturing implant positions
3Stability of the object's composition
If the geometry for prevention of turning is too long in conventional impression copings, then rotation can be prevented, but self-closure occurs during removal
Solution Approach 1:
The anti-rotation geometry is designed to work dynamically with the movable element. During removal, the movable element shifts to create space that allows the anti-rotation features to disengage without causing self-closure, while still maintaining rotation prevention during the impression-taking process
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3~4b
AI summary
Impression coping for taking open tray impression for making dental prosthesis. The impression coping comprises a counterpart and a central screw. The shank (6) of the central screw (8) is guided through the counterpart (4) and a tubular screw (11). On the tubular screw (11) a moving element (16) is arranged which is axially movable and rotatable around its axis. The end of the external screw (10) distant from the implant (2) is provided with a flange (24) while on its end adjacent to the implant (2) an arrester (17) provided with threads is formed. On the inner surface of the upper moving element (14) internal threads (22) mating with threaded arrester (17) of the external screw (10) are provided. Between a lower moving element (15) and the internal screw (9) an axially movable slider (18) is provided. The upper moving element (14) and the lower moving element (15) are secured to each other in unreleasable manner.