Digital Overdenture Guide for Abutment Alignment and Bar Bending
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Solution Overview
Problem
Conventional methods for manufacturing overdentures face challenges in precision and convenience due to difficulties in aligning abutments with fixtures, leading to potential bone damage and discomfort, especially when obtaining accurate gum tissue information and managing the bending of fixing bars.
Innovation Solution
A method involving a digital approach that includes aligning implantation information in 3D planning images, designing surgical guides and holder abutment mounting guides, and using a fixing bar bending apparatus to ensure precise alignment and fixation of holder abutments with fixtures, utilizing 3D printing for rapid and accurate manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If abutments are transferred and fixed to fixtures one by one manually, then the process is flexible, but the alignment precision between through insertion portion opening directions and fixing bar extension direction deteriorates
Solution Approach 1:
A guide device is introduced as an intermediary tool during the fixing process. The guide device includes positioning structures that guide the abutments to be fixed at precise positions and orientations, ensuring that the opening directions of the through insertion portions align with the extension direction of the fixing bar. This mediator resolves the contradiction by providing manual operability while enforcing precision through its structural design.
Solution Approach 2:
The guide device is designed with pre-determined positioning features that establish the correct orientation and position of abutments before the fixing bar is inserted. By performing the alignment action preliminarily through the guide structure, the system ensures precise alignment without requiring complex manual adjustment during the fixing process.
2Ease of operation
If fixing bar is simply bent by hand without proper guidance, then the operation is simple, but the alignment with implantation positions of fixtures deteriorates and causes bone damage
Solution Approach 1:
The guide device serves as a mediator that provides proper guidance during the bending and insertion of the fixing bar. It includes positioning structures that ensure the fixing bar is bent and positioned at the correct angles and locations corresponding to the implantation positions of the fixtures, preventing bone damage while maintaining operational simplicity.
Solution Approach 2:
The guide device is designed with positioning features that prevent improper bending and misalignment before the fixing bar is fully inserted. By providing predetermined positioning structures, the system cushions against potential errors that could cause bone damage or misalignment, ensuring safe and precise operation.
3Ease of manufacture
If conventional impression body method is used to obtain gum information, then the process is traditional, but the time consumption increases and precision deteriorates due to gum pressurization
Solution Approach 1:
The patent replaces the conventional mechanical impression body method with a digital scanning system. An intraoral scanner or similar digital device captures three-dimensional surface information of the gum and oral cavity without physical contact or pressurization. This substitution eliminates the time-consuming steps of material setting and model manufacturing while providing more accurate digital data for prosthetic design.
Solution Approach 2:
Instead of creating a physical impression and model, the system creates a digital copy or three-dimensional digital model of the oral cavity using scanning technology. This digital copy preserves all necessary geometric information without the drawbacks of physical impression materials, reducing both time and potential tissue damage while maintaining manufacturing ease through digital workflows.
Data Source
AI summary
Disclosed is a method of manufacturing a digital overdenture. The method includes a first operation of aligning and setting a plurality of pieces of implantation information of fixtures according to alveolar bone information in a planning image, a second operation of designing and manufacturing a surgical guide and a holder abutment mounting guide, a third operation of preparing a temporary denture corrected to form a temporary holder insertion portion having an inner surface part into which a holder device is inserted to be shape-matched therewith, in which the surgical guide is installed in the target arch to implant the fixtures and the fixing bar is fixed to the holder abutments moved to and coupled with top ends of the fixtures by the holder abutment mounting guide, and a fourth operation of manufacturing a digital overdenture including an artificial tooth portion and an artificial gum portion.