Mandibular movement trajectory tracking

Mandibular movement trajectory tracking acquires 3D images from the dentulous mandible and track the mandibular movements, which allows you to better simulate the mandibular movements and its effect on the entire face so as to provide targeted therapy. The whole scanning process includes:

1 Static Face2 Mandibular Movement Trajectory Tracking3 Resting Face4 Data Alignment

1) Marker Recognition2) Static Face

Recognize the coordinates of the markers for the alignment with face data.

Preparation

• Disinfect the markers with a 75% alcohol swab and clean the patient's teeth surface to remove plaques.
• Assist the patient in wearing a disposable mouth retractor to maintain an open state.

Steps

1. With the patient’s mouth open, dry the surface of the teeth with dry cotton balls or an air syringe.

2. Select Stick markers or Jaw Motion Tracker and prepare the patient for scanning. Once the patient is ready, click Confirm.

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   Caution

   • More than 4 markers are required.
   • Markers cannot be sticked in an approximate straight line.
   • Please fix Featured Shell before using Jaw Motion Tracker and place markers.

3. Enter the number of markers placed, click Confirm, to collect two sets of marker data.

   

4. Choose Handheld Mode or Fixed Mode in the lower left corner of the interface.

   Description

   The default is handheld mode. In fixed mode, the camera window mirrors the scan.

5. Start scanning:

   1. Instruct the patient to keep the head still and maintain a stable expression. Ensure that the upper and lower jaws are in an occlusal state.

   2. The scanner's camera will automatically count the markers and record the number.

      Note

      • If the number of markers recognized by the camera matches the input number, the coordinates of the markers are automatically saved.

      • If the number of markers does not match the input number, adjust the facial position or place the markers again.

      • If recognized markers turn orange, please check the scanning angle and ensure the markers are not be covered, moved, or wet. If you find any problem, please reattach the markers or recalibrate the device.

   3. Tell the patient to open the mouth slightly. The camera will automatically recognize the number of markers on the upper and lower jaw again.

Preparation

• Ensure that the patient is wearing the retractor or tracker, with the upper and lower jaws in the intercuspal position.

• Ensure that the markers are securely pasted to avoid falling off during the scanning process.

Steps

1. Adjust the facial position:

   • Face recognition: The face is centered, and the face detection box shows green.
   • Markers recognition: Ensure the markers are recognized as green.
   • Appropriate distance: The distance indicator shows Suitable.

2. Maintain a stable facial position and prepare to start scanning:

   • Handheld mode: Press Space or click to start scanning.
   • Fixed mode: Scanning starts automatically after a 3-second countdown or can be started manually, similar to the handheld mode.

   Note

   The countdown guide for handheld mode is turned off by default and can be enabled in Scan Settings.

3. In handheld mode, you need to move the scanner up, down, left, and right to scan the patient's head; in fixed mode, guide the patient to slowly and evenly rotate their head up, down, left, and right.

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   Handhold Mode

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   Fixed Mode

4. Press Space again or click to end the scan.

5. After the scan is completed, the software will automatically align the scanned model and oral scan model to obtain the oral scan model in the rest position.

   • Automatic alignment successful:

     • The heat map is displayed by default to check the alignment effect; click will hide the heat map.
     • If you are not satisfied with the alignment effect, you can click to go to the Data Alignment to align them again.
     • If you are not satisfied with the facial scanning effect, you can click to rescan.

   • Automatic alignment failed:

     The interface will prompt that alignemnt has failed, and you need to go to the Data Alignment for manual alignment.

6. Click to go to the next process.

The movement trajectories and jaw positions included in the template will be applied. You can click the to preview the template.

Before starting the tracking, you may click the to scan the QR code or directly visit the Mandibular Movement Video Guide Website, allowing the patient to view the instructional videos and practice in advance.

Steps

1. Select the type of movement you want to record.
   To record a customized movement, click to add a customized movement or jaw poisition.

2. Adjust the facial position to align with the face detection box on the interface. When correctly aligned, the box will display in green.

3. Press Space or click to start recording the trajectory.

4. Instruct the patient to complete the selected movement. Only perform a single movement during each trajectory recording.

   Note

   • Ensure that the patient keeps their head stable throughout the recording process to obtain accurate mandibular movement data.
   • If a patient's marker falls off, you can pause the scan, then click to place the marker.
   • During this process, the patient's upper and lower jaws must be in occlusion.

5. Press Space again or click to end this trajectory recording.

6. Repeat Steps 3–5 until the trajectory of movement has been recorded the required number of times (as specified in the template).

   Click to record more trajectories.

7. After all trajectories of one movement are recorded, the software will automatically go to the next movement.

Note

• Retain at least one trajectory for each type of movement, with a maxmimum of five.
• If the recorded trajectory are not satisfying, you can click to record it again.
• To export trajectory data in XML format for further operation, make sure to set CAD type to 3rd party when exporting the order.

Related Operations

Icon	Description
	View Previous Frame
	Start Playback
	View Next Frame
1X	Select Playback Speed
	Replay
	View occlusion
	Expand Occlusion

Steps

1. Instruct the patient to adjust their facial position, keeping the face relaxed with a slightly open mouth and a stable expression, while maintaining an appropriate distance from the camera.

   • Face recognition: Face is centered, and the face detection box is displayed in green.
   • Appropriate distance: The distance indicator shows Suitable.

2. Maintain a stable facial position and prepare to start scanning:

   • Handheld mode: Press Space or click to start scanning.
   • Fixed mode: Scanning starts automatically after a 3-second countdown or can be started manually, similar to the handheld mode.

   Note

   The countdown guide in handheld mode is turned off by default and can be enabled in Scan Settings.

3. In handheld mode, you need to move the scanner up, down, left, and right to scan the patient's head; in fixed mode, guide the patient to slowly and evenly rotate their head up, down, left, and right.

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   Handheld mode

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   Fixed mode

4. Press Space again or click to end the scan.

5. Click Data Alignment to align the resting face with the static face.

Click to align the data.

Note

• By default, a upper or lower jaw model is aligned with face scan.
• When Separate Alignment of Upper and Lower Jaw with Face Scan is checked, an additional alignment step is added, allowing the upper and lower jaw data to be aligned separately with the face scan.

Intraoral Model and Static FaceResting Face and Static Face

Auto alignment	Manual alignment
Click and the software will automatically align the data. Click if the alignment effect is not ideal.	Steps 1) Click to start manual alignment. 2) Click on the upper/lower jaw and the static face respectively to select 3 ~ 12 corresponding points. 3) Click to confirm. Caution Those added points should not be in one straight line.

Click to check the alignment effect.

Align the resting face data with the static face containing the dental retractor. Click Resting face and Static facial on the left.

Auto alignment	Manual alignment
Click and the software will automatically align the data. Click if the alignment effect is not ideal.	Steps 1) Click to start manual alignment. 2) Click on the resting face and the static face respectively to select 3 ~ 12 corresponding points. 3) Click to confirm. Caution Those added points should not be in one straight line.

Click to check the alignment effect.