Apparatus, system, and methods for utilizing one or more computing devices to stage the movement of teeth during an alignment treatment are disclosed. The clot pulling device may include a shaft and one or more strut members that each may include a loop region. The sensor is calibration-adjusted, eliminating the need for a user to enter a calibration code or for the meter to read a calibration code. The playback module is for playing back the video signal from the image processing module. The invention is applicable to three-dimensional imaging systems which use a combination of different imaging techniques to achieve a higher precision or a higher level of reliability.