Tooth Replacement Part With Variable Screw Channel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for securing tooth replacement parts on implants often result in visible screw heads and incomplete concealment of the screw channel, leading to aesthetic issues and accessibility challenges.
Innovation Solution
A method involving a 3D model of a tooth replacement part with a continuous screw channel that increases in size towards the occlusal or incisal end, allowing for a uniform inlay to be inserted, which matches the color and shape of the tooth replacement part, ensuring easy screw accessibility without damaging the part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous screw channel is closed by means of composite filling, then the screw becomes accessible by removing the composite, but parts of the abutment and screw show through the composite filling causing dark appearance and aesthetic issues
Solution Approach 1:
The inlay is designed with differentiated regions: a first region that fills the screw channel opening and a second region that forms a continuous surface with the tooth replacement part. This local differentiation allows the inlay to simultaneously conceal the screw channel (aesthetic function) and provide access to the screw (functional function) by removing only the first region.
Solution Approach 2:
The inlay is segmented into two functional regions: a first region for filling the screw channel opening and a second region for forming the continuous surface. This segmentation allows independent optimization of each region's function - the first region can be removed for screw access while the second region maintains the aesthetic appearance.
2Ease of manufacture
If the screw channel has a constant cross sectional area, then the inlay can be easily inserted, but the screw head may show through the tooth replacement part
Solution Approach 1:
The screw channel is designed with variable cross-sectional area along its length, with the opening at the second end being larger than the portion deeper in the channel. This local variation allows the inlay to be inserted easily through the larger opening while the narrower portion deeper in the channel prevents the screw head from showing through the tooth replacement part.
3Illumination intensity
If the cross sectional area of the screw channel increases towards the second end, then the inlay can be inserted easily and aesthetic appearance is maintained, but the screw channel requires more material and complex geometry
Solution Approach 1:
The screw channel's cross-sectional area parameter is varied along its length, transitioning from a smaller area at the implant end to a larger area at the opening. This parameter change enables the channel to maintain structural integrity while providing sufficient opening size for inlay insertion and preventing screw head visibility through the tooth replacement part.
Data Source
AI summary
A method for producing a tooth replacement part to be secured on an implant, based on a 3D model of the tooth replacement part with a surface and with a continuous screw channel with an initial shape in the form of a cylindrical barrel, with a first and a second end, wherein a cross sectional area of the screw channel is designed to be constant and/or to increase in size towards the second end of the screw channel. A 3D model of an inlay with a jacket surface, an upper face and a lower face is generated. A part of the surface of the 3D model of the tooth replacement part that is cut out through the second end of the final shape of the screw channel is used as the upper face and the jacket surface is configured as a negative form of a part of the final shape of the screw channel that adjoins the second end.