Threaded Dental Post and Core Without Margins

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Solution Overview

Problem

Conventional dental prostheses with margins or shoulders on post and core systems face challenges such as delayed placement due to gum healing time, increased risk of gingival recession, poor aesthetic appearance, and bacterial insulation issues, as the smaller diameter at the base of the post and core exposes it to bacteria and causes tissue contraction.

Innovation Solution

A dental prosthesis design featuring a post and core system without margins, where the diameter converges continuously from the implant to the crown, incorporating a microscopic ascending thread to facilitate tissue regeneration and improve bacterial insulation, allowing for simultaneous placement with the implant and enabling crown replacement without disconnection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a margin or shoulder is provided on the post and core, then the crown can be supported and positioned, but the gum healing time is extended and the post and core becomes visible due to tissue contraction

Engineering Contradiction:

Improvecrown support and positioningVSAvoidgum healing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention removes the margin or shoulder feature from the post and core design. By extracting this problematic element, the patent eliminates the need for extended gum healing time while maintaining crown support through alternative means (the threaded connection system). The post and core diameter remains constant throughout, preventing tissue contraction and exposure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of having the crown rest on a margin at the gum level, the invention inverts the approach by having the crown threaded onto the post and core at a higher level. This reversal allows the gum to heal without obstruction and prevents the post and core from becoming visible, while still providing secure crown support.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If the post and core diameter diverges from the implant towards the crown, then the crown can be positioned, but the gum contracts towards the implant and exposes the post and core

Engineering Contradiction:

Improvecrown positioningVSAvoidgingival recession and bacterial exposure

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The invention applies a uniform diameter throughout the post and core structure rather than varying the diameter. This local consistency in dimensional quality prevents differential tissue contraction and ensures the gum heals evenly, covering the post and core completely while maintaining secure crown positioning through the threaded connection.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the post and core is disconnected to place the final tooth, then the crown can be positioned definitively, but gingival recession is accentuated

Engineering Contradiction:

Improvecrown placementVSAvoidgingival recession

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The invention segments the prosthesis system into three independent components: the implant, the post and core, and the crown. Each can be placed and secured separately through threaded connections, eliminating the need to disconnect the post and core during crown placement. This segmentation allows definitive crown positioning without causing gingival recession.

Inventive Principle:

Principle #1Segmentation

4Reliability

If a margin is provided on the post and core, then the crown can be supported, but the aesthetic appearance deteriorates and bacterial insulation is reduced

Engineering Contradiction:

Improvecrown supportVSAvoidaesthetic appearance

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The invention removes the margin or shoulder feature that compromises aesthetics. By extracting this element, the post and core maintains a uniform diameter that remains completely covered by healed gum tissue, eliminating visible deformities while preserving crown support through the threaded connection system.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10507086B2Dental prosthesis with threaded crown on post and core

Publication Date: 2019.12.17 SWEDEN & MARTINA

AI summary

A dental prosthesis with a threaded crown on a post and core includes a dental implant, a post and core having a portion adapted to be inserted into the implant and another portion protruding from the implant, a screw and a crown, the implant being adapted to be fixed to a bone and the post and core being adapted to be fixed to the implant with a thread, the crown being fixed to the post and core with the screw, wherein the post and core provides a connection element between the implant and the crown, a separation area being provided between the area where the post and core is housed in the crown and the area where the post and core is housed in the implant, and wherein the portion of the post and core protruding from the implant does not feature a diameter increase.