Upper Molar Rotation Mechanism With Palatal Pivot Axis
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Solution Overview
Problem
Existing orthodontic appliances fail to effectively address the mesial rotation of upper molars, leading to lower incisor crowding due to the mesio-palatal cusp protruding from the opposing lower molar fossa, which results in occlusal interferences and subsequent tooth misalignment.
Innovation Solution
A displacement device that applies a torque to the upper molar, specifically around its palatal root, to induce a distal rotational movement, fixing the axis of rotation near the natural axis of the molar, using mechanisms like torsion springs, tension springs, or repulsive magnets to maintain the mesio-palatal cusp in the opposing fossa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tooth is extracted and a bridge or implant is used, then the gap is closed and chewing function is restored, but the natural tooth movement capability is lost and adjacent teeth may shift position
Solution Approach 1:
The invention enables the denture to automatically adjust and move itself within the oral cavity using natural chewing forces. The denture body is designed to shift position and adapt to changes in the dental arch without requiring external intervention or fixed anchoring to adjacent teeth, thus maintaining natural adaptability while restoring function.
Solution Approach 2:
The denture is designed as a dynamic structure that can move and adjust its position during chewing and speaking. Unlike fixed bridges or implants, this denture allows for natural tooth movement and adaptation to the changing oral environment, resolving the contradiction between functional reliability and movement capability.
2Reliability
If a fixed bridge or implant is used to replace missing teeth, then chewing function is restored, but the device becomes fixed and cannot adapt to natural tooth movement or changes in the dental arch
Solution Approach 1:
The denture is designed as a dynamic structure that can move and adjust its position during chewing and speaking. Unlike fixed bridges or implants, this denture allows for natural tooth movement and adaptation to the changing oral environment, resolving the contradiction between functional reliability and movement capability.
Solution Approach 2:
The denture utilizes changes in physical parameters such as pressure and position during functional activities. The denture body changes its position and contact points with the alveolar ridge based on chewing forces, allowing it to adapt to natural tooth movement and changes in the dental arch over time.
3Ease of manufacture
If conventional dentures are used, then they can be removed for cleaning, but they lack stability and do not provide adequate chewing function
Solution Approach 1:
The denture automatically cleans itself during functional activities. The chewing motion and pressure applied to the alveolar ridge create self-cleaning effects that remove food particles and plaque, eliminating the need for removal while maintaining hygiene and adequate chewing function.
Solution Approach 2:
The dynamic movement of the denture during chewing creates beneficial cleaning effects. The denture's ability to move and press against the alveolar ridge during functional activities provides self-cleaning action, resolving the contradiction between ease of cleaning and chewing function stability.
4Reliability
If a denture is designed to fit tightly on the alveolar ridge for stability, then chewing function is improved, but it becomes difficult to clean and maintain hygiene
Solution Approach 1:
The denture automatically cleans itself during functional activities. The chewing motion and pressure applied to the alveolar ridge create self-cleaning effects that remove food particles and plaque, eliminating the need for removal while maintaining hygiene and adequate chewing function.
Solution Approach 2:
The denture utilizes changes in pressure and position during chewing to create self-cleaning effects. The dynamic interaction between the denture and alveolar ridge changes the contact parameters, allowing food particles to be expelled and surfaces to be cleaned during normal function.
Data Source
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Figure 6~8A
AI summary
The invention relates to a device for moving an upper molar (M) having a mesiopalatal cusp, said device comprising: - a support (12) attached to the molar (M), - a rod (14) having a first end (14.1) anchored to a bone of the palate or to at least one tooth adjacent to the molar such that, when the device is in place, the rod has a given position relative to the molar (M), - a joint (A1) that rotates between the support (12) and the rod (14), having an axis of rotation (X1) that is stationary relative to said rod (14) and perpendicular to the occlusal plane, said axis of rotation (X1) being arranged close to the mesiopalatal cusp of the molar (M), - a spring for applying a force to the palatal face of said molar, by applying a rotation to said molar (M) about the axis of rotation (X1) such that said molar (M) rotates distally.