Denture Positioning Means for Accurate Artificial Tooth Placement
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Solution Overview
Problem
When using CAD/CAM techniques for denture production, artificial teeth often shift from their designed position due to larger recesses needed for fitting, disrupting the occlusal relationship.
Innovation Solution
A method involving data-driven design and production of denture bases, artificial teeth, and occlusal guides with positioning means to accurately place and fix artificial teeth on the denture base, using a coupling mechanism to maintain the intended positional relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If recesses are made larger to fit artificial teeth easily, then ease of manufacture is improved, but manufacturing precision deteriorates because artificial teeth shift from designed positions
Solution Approach 1:
A positioning member is introduced as an intermediary component between the denture base and artificial teeth. This positioning member includes positioning protrusions that fit into positioning recesses, providing precise location guidance while allowing the artificial teeth to be easily attached to the positioning member itself. The positioning member acts as a mediator that transfers the precise positioning function from the denture base to the artificial teeth without requiring large recesses in the denture base.
Solution Approach 2:
The attachment system is divided into separate functional components: the denture base with positioning recesses, the positioning member with positioning protrusions, and the artificial teeth. This segmentation allows each component to be optimized independently - the denture base provides stable support, the positioning member provides precise positioning, and the artificial teeth provide chewing function. The positioning member can be separately manufactured and then attached to the denture base, simplifying the overall manufacturing process while maintaining precision.
2Productivity
If CAD/CAM is used to reduce production time, then productivity is improved, but device complexity increases due to additional positioning systems
Solution Approach 1:
The positioning member is pre-formed with the exact positioning protrusions needed, and the denture base is pre-formed with corresponding positioning recesses using CAD/CAM technology. This preliminary preparation of precise positioning features allows for rapid assembly later without requiring complex adjustment procedures during the main denture fabrication process. The positioning systems are built-in advance rather than added during assembly, reducing overall production time despite the additional component.
Data Source
AI summary
A method for designing dentures according to which artificial teeth can be easily and accurately attached to a denture base, which is designed and shaped by CAD/CAM, when the artificial teeth are arranged on the denture base is provided. The method for designing a denture (10) on a computer based on data on an intraoral shape comprises: creating data on a shape of a denture base (20) based on the intraoral shape (S22); creating data on a position of an artificial tooth (30) to be arranged on the denture base (S23); and creating data on a shape of an occlusal guide (40) that is tabular and has a recess part corresponding to a shape of the arranged artificial tooth in an occlusal surface side (S24).