Dental Impression Indexing for Natural Head Position Alignment
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Solution Overview
Problem
Existing CAD software programs face challenges in accurately orienting virtual patients due to the lack of horizon orientation information, particularly in patients with asymmetries, and require cumbersome equipment that can introduce errors in 3-D data translation from natural head position (NHP) to a 3-dimensional virtual patient.
Innovation Solution
A simplified indexing device with a pivot block and base, using a 'NHP self-balance plus mirror' method, allows for simplified and repeatable transfer of patient data into a 3-dimensional virtual patient by aligning scans through a reference coordinate system, incorporating a spirit level and midline grooves for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known techniques for translating patient data in NHP into 3-dimensional virtual patient are used, then orientation information can be obtained, but numerous pieces of specialized equipment are required which are cumbersome and can introduce errors
Solution Approach 1:
The patent extracts and isolates the critical orientation reference function into a dedicated NHP reference indicator that can be positioned on the patient's head. This separate reference element can be scanned independently and used to establish horizon orientation without requiring complex specialized equipment, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The NHP reference indicator serves as an intermediary element between the patient's natural head position and the digital scanning system. This mediator provides a visible, scanable reference that translates physical orientation into digital space, enabling accurate orientation transfer using standard scanning equipment rather than specialized devices
2Adaptability or versatility
If CAD software programs are used to incorporate digital photographs and facial scans, then facially driven treatment planning is facilitated, but the lack of orientation information makes determining horizon parallel challenging
Solution Approach 1:
The patent applies preliminary action by establishing the NHP reference indicator on the patient's head before scanning begins. This pre-positioned reference ensures that horizon orientation information is captured along with the facial scan data, preventing information loss and enabling accurate orientation reference throughout the treatment planning process
Solution Approach 2:
The system provides feedback by incorporating the NHP reference indicator into the scanned data, which then serves as a visible reference within the CAD software. This feedback loop allows the orientation information to be visualized and used throughout subsequent treatment planning steps, maintaining adaptability while preventing information loss
Data Source
AI summary
A system and method enable repeatably aligning dental impression with patient's natural head position (NHP). Dental indexing tray is coupled to a scannable base, which pivotally engages a pivot block. The pivot block is positioned in a level position using a spirit level, and the base, pivot block and patient's face in the NHP are scanned. The scanned material provides an indexing system to align subsequent facial scans to the position of the indexing tray.