Frustoconical Dental Implant Transfer Abutment for Stable Impressions
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Solution Overview
Problem
Current dental implant systems face challenges in achieving precise impression taking and easy removal of impressions due to unstable transfer pin positioning and adherence issues, leading to imprecise impressions and difficulties in removing the abutment from the implant.
Innovation Solution
A dental implant system with a frustoconical cavity and a through seat for the abutment, featuring a screw-type or plateau-type design with a prismatic end space for stable positioning of the transfer and abutment, and a double-conical transfer post configuration for secure frictional adherence during impression taking, allowing for easy removal after hardening of the deformable material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a definitive abutment is used for impression taking, then the impression can be supported stably, but the impression becomes difficult to remove from the patient's mouth due to shape adherence
Solution Approach 1:
The invention extracts the retention function from the definitive abutment by using a separate transfer abutment with a frustoconical post that fits into a frustoconical cavity in the implant. This allows the impression to be supported stably during taking while enabling easy removal by simply unscrewing the transfer abutment, eliminating the adherence problem of using the definitive abutment directly.
Solution Approach 2:
The transfer abutment serves as an intermediary component between the implant and the impression material. It provides stable support for the impression while being easily removable, thus mediating between the need for stability during impression taking and the need for ease of removal afterward.
2Ease of operation
If a transfer abutment with a cylindrical pin is used, then the impression can be taken, but the pin does not maintain the abutment in a stable condition leading to imprecise impression taking
Solution Approach 1:
The invention replaces the cylindrical pin with a frustoconical post that has a tapered surface. This conical geometry provides superior mechanical engagement and stability within the matching frustoconical cavity, preventing rotation and ensuring precise positioning of the transfer abutment, which directly improves impression taking precision.
Solution Approach 2:
The invention changes the geometric parameters of the transfer post from cylindrical to frustoconical shape. This parameter change increases the contact surface area and mechanical interlocking between the transfer post and implant cavity, thereby enhancing stability and precision of the transfer abutment positioning.
3Device complexity
If the transfer abutment lacks circumferential positioning features, then the design is simpler, but the circumferential position inside the implant cannot be identified
Solution Approach 1:
The invention introduces asymmetric features (such as non-circular cross-sections or positioning elements) on the transfer abutment and corresponding features in the implant cavity. This asymmetry provides natural circumferential positioning and orientation, allowing the dentist to identify and verify the correct position of the transfer abutment without adding significant complexity to the overall design.
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 system enables precise and stable impression taking with easy removal of the impression, reducing implant dimensions, and allowing better integration and stabilization of the dental implant in the dental arch, while minimizing the risk of adherence issues.
Implementation Method 1
The transfer has a transfer post with a first frustoconical superficial retaining portion... The contact between the abutment attachment portion and the inner portion of the dental implant mainly occurs by the projections that are elastically and plastically deformable
Implementation Method 2
The prosthetic component also comprises a resilient member partially located in a recess on the shaft when in an uncompressed state. The resilient member acts to create a frictional force between the shaft and implant platform
Data Source
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AI summary
A dental implant system has a dental implant (1) provided with an implant frustoconical cavity (2); an abutment (19) having an abutment post (20) of size and shape such as to be permanently retained in the implant frustoconical cavity (2) and an abutment head (22) suitable for supporting a dental crown (13); a dental transfer (4) having a transfer post (5) intended to be inserted into the implant frustoconical cavity (2) before an impression taking, and a transfer head (7) identical to the abutment head (22) of the abutment (19); and an implant analog (11) having an analog internal cavity (16) suitable for receiving the transfer post (5), and an outer surface (14) provided with undercuts (15) to be retained inside a plaster model (12) in casting a dental model into said impression. The implant frustoconical cavity (2) of the dental implant (1) is a through hole.