Prefabricated Dental Crown Snap-On Protrusions for Stable Seating
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Solution Overview
Problem
Ceramic and composite dental crowns lack sufficient stability due to their inelastic nature, relying solely on cement for securement, while metal crowns, being bendable, require complex manipulation to create undercuts for stability, limiting their application in prefabricated crowns.
Innovation Solution
Dental crowns with protrusions extending from the interior crown wall, allowing a 'snap-on' mechanism to secure around retention features on the tooth structure, distributing seating and removal forces effectively, thereby enhancing stability and fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If ceramic or composite materials are used for dental crowns, then aesthetic appearance is improved, but seating stability deteriorates due to inelastic nature
Solution Approach 1:
The crown is segmented to include multiple protrusions distributed around the interior crown wall, each capable of independently engaging with retention features on the tooth structure. This segmentation allows the inelastic ceramic or composite material to achieve stable seating through multiple discrete engagement points rather than relying on overall material elasticity.
Solution Approach 2:
The protrusions are pre-formed on the interior crown wall before seating, positioned to align with retention features on the prepared tooth structure. This preliminary configuration enables the snap-on mechanism to engage automatically during seating, eliminating the need for complex manipulation of the crown material itself.
2Reliability
If metal crowns are manipulated to create undercuts for stability, then seating stability is improved, but device complexity and ease of manufacture deteriorate
Solution Approach 1:
The protrusions are pre-formed on the interior crown wall during manufacturing, positioned to align with retention features on the prepared tooth structure. This preliminary configuration enables the snap-on mechanism to engage automatically during seating, eliminating the need for complex manipulation of the crown material itself.
Solution Approach 2:
The protrusions are designed to automatically engage with retention features on the tooth structure during the seating process itself, without requiring separate manipulation steps. The crown's own geometry provides the securing mechanism, making the system self-servicing during installation.
3Reliability
If protrusions are added to secure the crown, then seating stability is improved, but manufacturing complexity increases
Solution Approach 1:
The protrusions serve multiple functions: they provide the snap-on securing mechanism, distribute occlusal loads, and engage with retention features on various tooth preparations. This multi-functionality is achieved through a single geometric feature that can be integrated into standard crown manufacturing processes.
Solution Approach 2:
The protrusions can be varied in number, size, shape, and distribution to optimize performance for different crown sizes, tooth preparations, and material types. This parameter flexibility allows the same basic concept to be manufactured across a range of specifications without fundamentally changing the manufacturing approach.
Data Source
Figure 1A~1B
Figure 1C~2B
Figure 2C~3A
AI summary
Dental crowns having securing protrusions, methods of preparing said dental crowns, and methods of repairing a tooth with said dental crowns are described.