Hand-Held Dental Camera 3D Recording with Standard Jaw Model Guidance
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Solution Overview
Problem
Existing methods for optical three-dimensional recording using hand-held dental cameras often result in incorrect registration due to small overlapping areas, recording errors, and interference from objects like cheeks or tongues, leading to incomplete and time-consuming measurements.
Innovation Solution
A method where a hand-held dental camera automatically records individual optical recordings at a set frequency, guided by a displayed three-dimensional standard jaw model, using control points for user guidance and optimized recording paths, with registration methods like ICP and color encoding to ensure accurate alignment and minimize data volume and recording time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual free movement of the hand-held camera is used during measurement, then the user has flexibility in positioning, but the measurement reliability deteriorates due to incorrect registration, repeated measurements, and gaps in coverage
Solution Approach 1:
The system provides visual feedback by displaying the current camera view overlaid with the standard jaw model and control points on a monitor. This allows the user to see in real-time whether they are capturing the correct areas, ensuring complete coverage without gaps or unnecessary repetitions while maintaining manual positioning flexibility
Solution Approach 2:
The standard jaw model serves as an intermediary between the user and the actual subject. By aligning the camera to capture control points on the standard model that correspond to anatomical landmarks, the system guides the user through the measurement process without restricting manual camera movement, thereby improving registration reliability
2Reliability
If automatic recording at high frequency is used, then measurement completeness improves, but data volume increases unnecessarily
Solution Approach 1:
The system performs preliminary action by displaying the complete measurement path and control points before the measurement begins. The user is guided to capture only the necessary control points in sequence, preventing unnecessary recordings and minimizing data volume while ensuring complete coverage of all required areas
Solution Approach 2:
The measurement is segmented into discrete control points that must be captured in sequence. Rather than continuous high-frequency recording, the system divides the measurement task into specific target points, reducing data volume while maintaining measurement completeness through structured point-by-point capture
3Productivity
If small overlapping areas are used in registration, then recording time decreases, but registration accuracy deteriorates due to insufficient overlap for reliable alignment
Solution Approach 1:
The system replaces traditional mechanical/visual overlap-based registration with color encoding and pattern recognition. Control points are captured with color information and geometric patterns that enable automatic, precise alignment without requiring large overlapping areas, thus maintaining fast recording speed while improving registration precision
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
This approach enables reliable, complete, and rapid measurement with repeatable registration, reducing unnecessary data collection and gaps, while ensuring accurate alignment and efficient data processing.
Implementation Method 1
The optical recordings are measured by means of the dental camera which, for example, can function according to a fringe projection method. In the fringe projection method, the individual fringes projected onto the subject are identified based on intensity, color, polarization, coherence, phase, contrast, location or duration. The 3D coordinates of the individual measuring points on the subject are then calculated using a triangulation method.
Implementation Method 2
The 3D coordinates of the individual measuring points on the subject are then calculated using a triangulation method
Implementation Method 3
Alternatively, a confocal measurement method may also be used to record the individual three-dimensional recordings of the subject
Data Source
AI summary
The invention relates to a method for performing an optical three-dimensional recording by using hand-held dental camera. The camera automatically records a plurality of individual optical recordings in succession at a defined frequency during the measurement. The individual three-dimensional optical recordings are combined into an overall recording of a dental object to be measured and before the measurement is performed, a three-dimensional standard jaw model is displayed using a display device and a first control point on the standard jaw model is displayed using the display device. The hand-held dental camera is then positioned in relation to the object to be recorded in such a way that the camera points at the first control point of the standard jaw model and records a corresponding recording region of the dental object.