Interproximal Reduction Planning for Tooth Alignment Stages

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Solution Overview

Problem

Dental treatments face challenges in determining the necessity and timing of interproximal reduction (IPR) procedures, leading to inaccurate material removal, poor access, and undesired tooth shapes due to residual crowding and misalignment.

Innovation Solution

A computing device-based method for interproximal reduction planning that identifies overlapping teeth in a digital dental model, aligns reference lines, and prescribes IPR at optimal stages to ensure accurate and efficient tooth alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If IPR procedure is conducted without proper planning and timing, then treatment can proceed quickly, but material removal accuracy deteriorates and additional corrective procedures are needed

Engineering Contradiction:
Improvetreatment speedVSAvoidmaterial removal accuracy
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The system performs preliminary digital planning and simulation of IPR procedures before actual treatment. The treatment professional uses software to visualize tooth positions, calculate required material removal, and determine optimal timing, thereby preparing the treatment plan in advance to ensure accuracy while maintaining efficiency.

Inventive Principle:
Principle #10Preliminary action

2Productivity

If IPR procedure is performed at incorrect treatment stage, then treatment progression is maintained, but access to tooth surfaces deteriorates

Engineering Contradiction:
Improvetreatment progressionVSAvoidaccess to tooth surfaces
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The system provides continuous feedback during treatment planning by simulating tooth movements and displaying real-time information about tooth positions and accessibility. This allows the treatment professional to adjust the treatment stage and timing to optimize access to tooth surfaces while maintaining treatment progression.

Inventive Principle:
Principle #23Feedback

3Productivity

If material is removed from misaligned teeth without alignment, then space is created quickly, but tooth shape and surface fit deteriorate

Engineering Contradiction:
Improvespace creation speedVSAvoidtooth shape accuracy
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The system performs preliminary alignment simulation and visualization before material removal. The treatment professional can see the expected tooth positions and shapes after alignment, allowing them to plan material removal precisely to achieve desired tooth shapes and surfaces while efficiently creating necessary space.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS20260033917A1Interproximal reduction planning
Publication Date: 2026.02.05 ALIGN TECHNOLOGY INC
  • US20260033917A1 patent drawing
  • US20260033917A1 patent drawing
  • US20260033917A1 patent drawing

AI summary

Computing device related, systems, and methods for interproximal reduction (IPR) planning. One method includes identifying a first tooth and a second tooth of a patient's teeth that overlap at a target position in a treatment plan and integrating the IPR into the treatment plan by: determining a stage of the treatment plan in which the first and second teeth are sufficiently aligned for performing IPR, and prescribing IPR at the determined stage of the treatment plan. Determining that the first and second teeth are sufficiently aligned may include calculating an angle between mesial-distal reference lines of the first and second teeth, and determining that the angle is within a predetermined threshold angle; and/or calculating a distance difference between a first ridge endpoint reference line of the first tooth and second ridge endpoint reference line of the second tooth, and determining that the distance difference is within a threshold distance.