Detachable Tooth Stump Positioning for Precise Dental Models
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Solution Overview
Problem
Existing dental models with removable tooth stumps face issues in maintaining the exact position and reproducibility of tooth stumps during prosthetic reconstruction, as current methods like saw cuts damage the marginal regions and U-shaped receiving cavities fail to ensure precise alignment with the antagonist and proximal teeth.
Innovation Solution
A dental model with a model base and removable tooth stump featuring an elastic positioning element, such as a positioning arm or shaft extension, that allows for a form-fitting and detachable connection, ensuring the tooth stump is aligned and fixed in a target position using projections and grooves, and can be easily repositioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If saw cuts are used to separate tooth stumps from the model base, then the tooth stumps can be removed, but the marginal regions and cervical region including the papilla are destroyed
Solution Approach 1:
The invention separates the tooth stump removal process from destructive cutting by introducing a dedicated receiving cavity structure. The tooth stump is designed as a separate component that can be inserted into and removed from the receiving cavity without damaging the model base or the tooth stump itself. This segmentation allows the tooth stump to be repeatedly removed and reinserted while preserving all marginal regions.
Solution Approach 2:
The receiving cavity acts as an intermediary structure between the tooth stump and the model base. Instead of directly cutting the tooth stump from the model base, the tooth stump is inserted into the receiving cavity which provides a controlled interface for attachment and detachment. This intermediary structure eliminates the need for destructive saw cuts while enabling easy removal and repositioning of tooth stumps.
2Ease of operation
If a U-shaped receiving cavity with continuous groove is used, then tooth stumps can be removed and repositioned, but the exact position of the tooth stump cannot be maintained due to displacement along the contour
Solution Approach 1:
The invention replaces the symmetric continuous U-shaped groove with an asymmetric discrete receiving cavity structure. The receiving cavity has a specific geometric shape that does not allow rotational symmetry, ensuring that the tooth stump can only be inserted in one unique orientation and position. This asymmetric design prevents displacement along the contour while still allowing easy removal and reinsertion of the tooth stump.
Solution Approach 2:
The receiving cavity is pre-formed with specific geometric features during model base production that define the exact target position for the tooth stump. Instead of allowing the tooth stump to be positioned anywhere along a continuous groove, the preliminary action of creating the discrete receiving cavity with specific dimensions and orientation pre-determines the precise location where the tooth stump must be inserted, ensuring reproducible positioning.
3Ease of operation
If friction points with support elements are used to connect the shaft to the model base, then the connection is detachable, but the position reproducibility is insufficient due to manufacturing tolerances and wear
Solution Approach 1:
The invention changes the geometric parameters of the receiving cavity and tooth stump interface from point-contact friction points to surface-contact form-fitting interfaces. The receiving cavity is designed with specific dimensional parameters that create a form-fit connection with the tooth stump shaft, where the geometric parameters of the cavity and shaft are matched to ensure precise positioning. This parameter change from friction-based to form-fit-based connection maintains detachability while significantly improving position reproducibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures precise alignment and reproducibility of tooth stumps, maintaining the preparation border visibility and alignment with adjacent teeth, even with wear or manufacturing tolerances, facilitating accurate prosthetic reconstruction.
Implementation Method 1
The model base and/or the shaft have an elastic positioning element for positioning the tooth stump relative to the model base
Data Source
AI summary
The invention relates to a dental model (1) for dental-technical modeling having a model base (2) and having a tooth stump (4) that can be removed from the model base (2), the model base (2) having a receiving cavity (3) for receiving the tooth stump (4), the tooth stump (4) having a preparation section (5), the preparation section (5) being designed for the prosthetic reconstruction of a tooth and the shaft (6) being designed for insertion along an insertion direction into the receiving cavity (3), the model base (2) and/or the shaft (6) having an elastic positioning element for positioning the tooth stump (4) relative to the model base (2).