Abstract: A system for preparing a prescription for the use of one or more orthodontal correction devices, such as aligners, which allows for remote interaction and guidance by dental professionals with their patients. The aligner may include a sensor to detect when it is being worn for tracking compliance and determining when the next correction device within the prescription should replace the current correction device. A software application associated with the patient allows them to view and track their progress and to send data to their dental professional, and similarly the dental professional is alerted by the present invention when compliance issues or other issues may arise requiring intervention.

Abstract: A resistive ferroelectric memory cell includes a selection transistor having first and second zones of a first conduction type. A storage capacitor has one electrode at a fixed cell-plate voltage and another electrode connected to the first zone of the selection transistor. A semiconductor substrate has a second conduction type opposite the first conduction type. The storage capacitor and the selection transistor are disposed in the semiconductor substrate. A resistor is disposed between the other electrode of the storage capacitor and the fixed cell-plate voltage. The resistor has a resistance R2 such that R3<<R2<<R1, in which R1 is a reverse resistance of a pn junction between the first zone of the selection transistor and the semiconductor substrate and R3 is a resistance between the first zone and the second zone of the selection transistor, in a turned-on state.